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Merge branch 'eugenp:master' into deepShallowCopy

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Neetika23
2023-10-21 20:23:16 +05:30
committed by GitHub
parent fc07da9eda b0ed62e8c8
commit c0d76384a4
1737 changed files with 32136 additions and 7144 deletions
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core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/ConstraintsBuilder.java
-15
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@@ -1,15 +0,0 @@
package reminderapplication;
import java.awt.GridBagConstraints;
import java.awt.Insets;
public class ConstraintsBuilder {
static GridBagConstraints constraint(int x, int y) {
final GridBagConstraints gridBagConstraints = new GridBagConstraints();
gridBagConstraints.gridx = x;
gridBagConstraints.gridy = y;
gridBagConstraints.insets = new Insets(5, 5, 5, 5);
return gridBagConstraints;
}
}
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/EditReminderFrame.java
-194
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@@ -1,194 +0,0 @@
package reminderapplication;
import static reminderapplication.ConstraintsBuilder.*;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.lang.reflect.InvocationTargetException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class EditReminderFrame extends JFrame {
private static Timer TIMER = new Timer();
private final TimeReminderApplication reminderApplication;
private final JLabel reminderTextLabel;
private final JLabel repeatPeriodLabel;
private final JLabel setDelayLabel;
private final JComboBox<Integer> delay;
private final JComboBox<Integer> period;
private final JButton cancelButton;
private final JButton okButton;
private final JTextField textField;
private final JLabel delaysLabel;
private final JLabel periodLabel;
private final int reminderIndex;
public EditReminderFrame(TimeReminderApplication reminderApp, String reminderText, int delayInSeconds, int periodInSeconds, int index) throws HeadlessException {
this.reminderApplication = reminderApp;
reminderIndex = index;
textField = createTextField(reminderText);
delay = createDelayComboBox(delayInSeconds);
period = createPeriodComboBox(periodInSeconds);
cancelButton = createCancelButton();
okButton = createOkButton();
reminderTextLabel = createReminderTextLabel();
repeatPeriodLabel = createRepeatPeriodLabel();
setDelayLabel = createSetDelayLabel();
delaysLabel = createDelaysLabel();
periodLabel = createPeriodLabel();
configureVisualRepresentation();
configureActions();
}
private void configureActions() {
updateReminder();
}
private void configureVisualRepresentation() {
configureFrame();
setLocationRelativeTo(null);
setLayout(new GridBagLayout());
add(reminderTextLabel, constraint(0,0));
add(repeatPeriodLabel, constraint(1,0));
add(setDelayLabel, constraint(2,0));
add(textField, constraint(0, 1));
add(delay, constraint(1, 1));
add(period, constraint(2, 1));
add(delaysLabel, constraint(1,3));
add(periodLabel, constraint(2,3));
add(okButton, constraint(1, 4));
add(cancelButton, constraint(2, 4));
pack();
setVisible(true);
}
private void configureFrame() {
setTitle("Set Reminder");
setName("Set Reminder");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
private static JLabel createSetDelayLabel() {
return createLabel("Set Delay", "Set Delay Label");
}
private static JLabel createRepeatPeriodLabel() {
return createLabel("Set Period", "Set Repeat Period Label");
}
private static JLabel createReminderTextLabel() {
return createLabel("Reminder Text", "Reminder Text Label");
}
private JLabel createPeriodLabel() {
return createLabel("0", "Period label");
}
private JLabel createDelaysLabel() {
return createLabel("30", "Delays Label");
}
private JComboBox<Integer> createPeriodComboBox(final int periodInSeconds) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{0, 5, 10, 20}));
comboBox.setSelectedItem(periodInSeconds);
comboBox.setName("set Period");
comboBox.addActionListener(e -> periodLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JComboBox<Integer> createDelayComboBox(final int delayInSeconds) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{30, 25, 15, 5}));
comboBox.setSelectedItem(delayInSeconds);
comboBox.setName("set Delay");
comboBox.addActionListener(e -> delaysLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JTextField createTextField(final String reminderText) {
final JTextField textField = new JTextField(20);
textField.setName("Field");
textField.setText(reminderText);
return textField;
}
private JButton createOkButton() {
final JButton button = new JButton("ok");
button.setName("OK");
return button;
}
private void updateReminder() {
okButton.addActionListener(e -> this.dispose());
okButton.addActionListener(e -> {
final int periodInSeconds = getTimeInSeconds(period);
final int delayInSeconds = getTimeInSeconds(delay);
final Reminder reminder = new Reminder(textField.getText(), delayInSeconds, periodInSeconds);
((DefaultListModel<Reminder>) reminderApplication.getReminders()).set(reminderIndex, reminder);
});
okButton.addActionListener(e -> scheduleReminder(textField, delay, period));
}
private void scheduleReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int periodInSeconds = getTimeInSeconds(period);
if (periodInSeconds == 0)
scheduleNonRepeatedReminder(textField, delay);
else
scheduleRepeatedReminder(textField, delay, period);
}
private void scheduleRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int delayInSeconds = getTimeInSeconds(delay);
final int periodInSeconds = getTimeInSeconds(period);
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds), TimeUnit.SECONDS.toMillis(periodInSeconds));
}
private void scheduleNonRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay) {
final int delayInSeconds = getTimeInSeconds(delay);
final int periodInSeconds = 0;
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds));
}
private int getTimeInSeconds(final JComboBox<Integer> comboBox) {
if (comboBox != null && comboBox.getSelectedItem() != null)
return ((Integer) comboBox.getSelectedItem());
else
return 0;
}
private TimerTask getTimerTask(final String reminderText, final Integer delayInSeconds, final Integer periodInSeconds) {
return new TimerTask() {
@Override
public void run() {
new ReminderPopupFrame(reminderApplication, reminderText, delayInSeconds, periodInSeconds);
}
};
}
private JButton createCancelButton() {
final JButton button = new JButton("cancel");
button.setName("Cancel");
button.addActionListener(e -> this.dispose());
return button;
}
private static JLabel createLabel(final String text, final String name) {
JLabel label = new JLabel(text);
label.setName(name);
return label;
}
}
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/Reminder.java
-33
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@@ -1,33 +0,0 @@
package reminderapplication;
public class Reminder {
private static String REMINDER_FORMAT = "Reminder Text: %s; Delay: %d; Period: %d;";
private final String name;
private final int delay;
private final int period;
public Reminder(final String name, final int delay, final int period) {
this.name = name;
this.delay = delay;
this.period = period;
}
public String getName() {
return name;
}
public int getDelay() {
return delay;
}
public int getPeriod() {
return period;
}
@Override
public String toString() {
return REMINDER_FORMAT.formatted(name, delay, period);
}
}
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/ReminderFrame.java
-186
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@@ -1,186 +0,0 @@
package reminderapplication;
import static reminderapplication.ConstraintsBuilder.*;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class ReminderFrame extends JFrame {
private static Timer TIMER = new Timer();
private final TimeReminderApplication reminderApplication;
private final JLabel reminderTextLabel;
private final JLabel repeatPeriodLabel;
private final JLabel setDelayLabel;
private final JComboBox<Integer> delay;
private final JComboBox<Integer> period;
private final JButton cancelButton;
private final JButton okButton;
private final JTextField textField;
private final JLabel delaysLabel;
private final JLabel periodLabel;
public ReminderFrame(TimeReminderApplication reminderApp) throws HeadlessException {
this.reminderApplication = reminderApp;
textField = createTextField();
delay = createDelayComboBox();
period = createPeriodComboBox();
cancelButton = createCancelButton();
okButton = createOkButton();
reminderTextLabel = createReminderTextLabel();
repeatPeriodLabel = createRepeatPeriodLabel();
setDelayLabel = createSetDelayLabel();
delaysLabel = createDelaysLabel();
periodLabel = createPeriodLabel();
configureVisualRepresentation();
configureActions();
}
private void configureActions() {
createNewReminder();
}
private void configureVisualRepresentation() {
configureFrame();
setLocationRelativeTo(null);
setLayout(new GridBagLayout());
add(reminderTextLabel, constraint(0,0));
add(repeatPeriodLabel, constraint(1,0));
add(setDelayLabel, constraint(2,0));
add(textField, constraint(0, 1));
add(delay, constraint(1, 1));
add(period, constraint(2, 1));
add(delaysLabel, constraint(1,3));
add(periodLabel, constraint(2,3));
add(okButton, constraint(1, 4));
add(cancelButton, constraint(2, 4));
pack();
setVisible(true);
}
private void configureFrame() {
setTitle("Set Reminder");
setName("Set Reminder");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
private static JLabel createSetDelayLabel() {
return createLabel("Set Delay", "Set Delay Label");
}
private static JLabel createRepeatPeriodLabel() {
return createLabel("Set Period", "Set Repeat Period Label");
}
private static JLabel createReminderTextLabel() {
return createLabel("Reminder Text", "Reminder Text Label");
}
private JLabel createPeriodLabel() {
return createLabel("0", "Period label");
}
private JLabel createDelaysLabel() {
return createLabel("30", "Delays Label");
}
private JComboBox<Integer> createPeriodComboBox() {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{0, 5, 10, 20}));
comboBox.setName("set Period");
comboBox.addActionListener(e -> periodLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JComboBox<Integer> createDelayComboBox() {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{30, 25, 15, 5}));
comboBox.setName("set Delay");
comboBox.addActionListener(e -> delaysLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JTextField createTextField() {
final JTextField textField = new JTextField(20);
textField.setName("Field");
return textField;
}
private JButton createOkButton() {
final JButton button = new JButton("ok");
button.setName("OK");
return button;
}
private void createNewReminder() {
okButton.addActionListener(e -> this.dispose());
okButton.addActionListener(e -> {
final int periodInSeconds = getTimeInSeconds(period);
final int delayInSeconds = getTimeInSeconds(delay);
final Reminder reminder = new Reminder(textField.getText(), delayInSeconds, periodInSeconds);
((DefaultListModel<Reminder>) reminderApplication.getReminders()).addElement(reminder);
});
okButton.addActionListener(e -> scheduleReminder(textField, delay, period));
}
private void scheduleReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int periodInSeconds = getTimeInSeconds(period);
if (periodInSeconds == 0)
scheduleNonRepeatedReminder(textField, delay);
else
scheduleRepeatedReminder(textField, delay, period);
}
private void scheduleRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int delayInSeconds = getTimeInSeconds(delay) + 200;
final int periodInSeconds = getTimeInSeconds(period);
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds), TimeUnit.SECONDS.toMillis(periodInSeconds));
}
private void scheduleNonRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay) {
final int delayInSeconds = getTimeInSeconds(delay);
final int periodInSeconds = 0;
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds));
}
private int getTimeInSeconds(final JComboBox<Integer> comboBox) {
if (comboBox != null && comboBox.getSelectedItem() != null)
return ((Integer) comboBox.getSelectedItem());
else
return 0;
}
private TimerTask getTimerTask(final String reminderText, final Integer delayInSeconds, final Integer periodInSeconds) {
return new TimerTask() {
@Override
public void run() {
new ReminderPopupFrame(reminderApplication, reminderText, delayInSeconds, periodInSeconds);
}
};
}
private JButton createCancelButton() {
final JButton button = new JButton("cancel");
button.setName("Cancel");
button.addActionListener(e -> this.dispose());
return button;
}
private static JLabel createLabel(final String text, final String name) {
JLabel label = new JLabel(text);
label.setName(name);
return label;
}
}
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/ReminderPopupFrame.java
-151
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@@ -1,151 +0,0 @@
package reminderapplication;
import static reminderapplication.ConstraintsBuilder.*;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class ReminderPopupFrame extends JFrame {
private static final Timer TIMER = new Timer();
private final int AUTOMATIC_CLOSE_TIME_IN_SECONDS = 10;
private final TimeReminderApplication reminderApplication;
private final JLabel reminderTextLabel;
private final JLabel repeatPeriodLabel;
private final JLabel setDelayLabel;
private final JComboBox<Integer> delay;
private final JComboBox<Integer> period;
private final JButton cancelButton;
private final JButton okButton;
private final JTextField textField;
private final JLabel delaysLabel;
private final JLabel periodLabel;
public ReminderPopupFrame(TimeReminderApplication reminderApp, final String text, final Integer delayInSeconds, final Integer periodInSeconds) throws HeadlessException {
this.reminderApplication = reminderApp;
textField = createTextField(text);
delay = createDelayComboBox(delayInSeconds);
period = createPeriodComboBox(periodInSeconds);
cancelButton = createCancelButton();
okButton = createDisabledOkButton();
reminderTextLabel = createReminderTextLabel();
repeatPeriodLabel = createRepeatPeriodLabel();
setDelayLabel = createSetDelayLabel();
delaysLabel = createDelaysLabel();
periodLabel = createPeriodLabel();
configureVisualRepresentation();
configureActions();
}
private void configureActions() {
scheduleClosing();
}
private void scheduleClosing() {
final TimerTask timerTask = new TimerTask() {
@Override
public void run() {
ReminderPopupFrame.this.dispose();
}
};
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(AUTOMATIC_CLOSE_TIME_IN_SECONDS));
}
private void configureVisualRepresentation() {
configureFrame();
setLocationRelativeTo(null);
setLayout(new GridBagLayout());
add(reminderTextLabel, constraint(0,0));
add(repeatPeriodLabel, constraint(1,0));
add(setDelayLabel, constraint(2,0));
add(textField, constraint(0, 1));
add(delay, constraint(1, 1));
add(period, constraint(2, 1));
add(delaysLabel, constraint(1,3));
add(periodLabel, constraint(2,3));
add(okButton, constraint(1, 4));
add(cancelButton, constraint(2, 4));
pack();
setVisible(true);
}
private void configureFrame() {
setTitle("Set Reminder");
setName("Set Reminder");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
private static JLabel createSetDelayLabel() {
return createLabel("Set Delay", "Set Delay Label");
}
private static JLabel createRepeatPeriodLabel() {
return createLabel("Set Period", "Set Repeat Period Label");
}
private static JLabel createReminderTextLabel() {
return createLabel("Reminder Text", "Reminder Text Label");
}
private JLabel createPeriodLabel() {
return createLabel("0", "Period label");
}
private JLabel createDelaysLabel() {
return createLabel("30", "Delays Label");
}
private JComboBox<Integer> createPeriodComboBox(final Integer periodInSeconds) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{0, 5, 10, 20}));
comboBox.setName("set Period");
comboBox.setSelectedItem(periodInSeconds);
comboBox.addActionListener(e -> periodLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JComboBox<Integer> createDelayComboBox(Integer delay) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{30, 25, 15, 5}));
comboBox.setSelectedItem(delay);
comboBox.setName("set Delay");
comboBox.addActionListener(e -> delaysLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JTextField createTextField(final String text) {
final JTextField textField = new JTextField(20);
textField.setName("Field");
textField.setText(text);
return textField;
}
private JButton createDisabledOkButton() {
final JButton button = new JButton("ok");
button.setName("OK");
button.setEnabled(false);
return button;
}
private JButton createCancelButton() {
final JButton button = new JButton("cancel");
button.setName("Cancel");
button.addActionListener(e -> this.dispose());
return button;
}
private static JLabel createLabel(final String text, final String name) {
JLabel label = new JLabel(text);
label.setName(name);
return label;
}
}
core-java-modules/core-java-11-2/README.md
-1
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@@ -5,7 +5,6 @@ This module contains articles about Java 11 core features
### Relevant articles
- [Guide To Java 8 Optional](https://www.baeldung.com/java-optional)
- [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
- [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
- [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
- [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)
core-java-modules/core-java-12/pom.xml
+4 -26
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@@ -8,9 +8,9 @@
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
@@ -21,30 +21,8 @@
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>12</maven.compiler.source.version>
<maven.compiler.target.version>12</maven.compiler.target.version>
<java.version>17</java.version>
</properties>
</project>
core-java-modules/core-java-12/src/test/java/com/baeldung/switchExpression/SwitchUnitTest.java
-13
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@@ -19,19 +19,6 @@ public class SwitchUnitTest {
Assert.assertEquals(value, 2);
}
@Test
public void switchLocalVariable(){
var month = Month.AUG;
int i = switch (month){
case JAN,JUN, JUL -> 3;
case FEB,SEP, OCT, NOV, DEC -> 1;
case MAR,MAY, APR, AUG -> {
int j = month.toString().length() * 4;
break j;
}
};
Assert.assertEquals(12, i);
}
enum Month {JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC}
}
core-java-modules/core-java-13/pom.xml
+4 -30
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@@ -8,39 +8,13 @@
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<release>13</release>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>13</maven.compiler.source.version>
<maven.compiler.target.version>13</maven.compiler.target.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
<java.version>17</java.version>
</properties>
</project>
core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java
-1
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@@ -7,7 +7,6 @@ import org.junit.Test;
public class SwitchExpressionsWithYieldUnitTest {
@Test
@SuppressWarnings("preview")
public void whenSwitchingOnOperationSquareMe_thenWillReturnSquare() {
var me = 4;
var operation = "squareMe";
core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java
-2
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@@ -8,7 +8,6 @@ public class TextBlocksUnitTest {
private static final String JSON_STRING = "{\r\n" + "\"name\" : \"Baeldung\",\r\n" + "\"website\" : \"https://www.%s.com/\"\r\n" + "}";
@SuppressWarnings("preview")
private static final String TEXT_BLOCK_JSON = """
{
"name" : "Baeldung",
@@ -25,7 +24,6 @@ public class TextBlocksUnitTest {
}
@SuppressWarnings("removal")
@Test
public void whenTextBlocks_thenFormattedWorksAsFormat() {
assertThat(TEXT_BLOCK_JSON.formatted("baeldung")
core-java-modules/core-java-13/src/test/java/com/baeldung/switchExpression/SwitchExpressionsUnitTest.java
-4
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@@ -13,7 +13,6 @@ import org.junit.Test;
public class SwitchExpressionsUnitTest {
@Test
@SuppressWarnings ("preview")
public void whenSwitchingOverMonthJune_thenWillReturn3() {
var month = JUNE;
@@ -29,7 +28,6 @@ public class SwitchExpressionsUnitTest {
}
@Test
@SuppressWarnings ("preview")
public void whenSwitchingOverMonthAugust_thenWillReturn24() {
var month = AUGUST;
@@ -47,7 +45,6 @@ public class SwitchExpressionsUnitTest {
}
@Test
@SuppressWarnings ("preview")
public void whenSwitchingOverMonthJanuary_thenWillReturn3() {
Function<Month, Integer> func = (month) -> {
@@ -61,7 +58,6 @@ public class SwitchExpressionsUnitTest {
}
@Test
@SuppressWarnings ("preview")
public void whenSwitchingOverMonthAugust_thenWillReturn2() {
var month = AUGUST;
core-java-modules/core-java-14/pom.xml
-1
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@@ -48,7 +48,6 @@
<properties>
<maven.compiler.release>14</maven.compiler.release>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
core-java-modules/core-java-15/pom.xml
+4 -31
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@@ -8,10 +8,9 @@
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../pom.xml</relativePath>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
@@ -27,34 +26,8 @@
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
<source>14</source>
<target>14</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.release>15</maven.compiler.release>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
<java.version>17</java.version>
</properties>
</project>
core-java-modules/core-java-16/README.md
+1 -1
View File
@@ -4,4 +4,4 @@
- [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
- [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
- [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
- [Value-Based Classes in Java](https://www.baeldung.com/java-value-based-classes)
core-java-modules/core-java-16/src/main/java/com/baeldung/value_based_class/Point.java
+54
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@@ -0,0 +1,54 @@
package com.baeldung.value_based_class;
import java.util.Objects;
import jdk.internal.ValueBased;
/**
* This class is written with the intention that it can serve as an example of
* what a Value-based class could be.
*/
@ValueBased
public final class Point {
private final int x;
private final int y;
private final int z;
private static Point ORIGIN = new Point(0, 0, 0);
private Point(int x, int y, int z) {
this.x = x;
this.y = y;
this.z = z;
}
public static Point valueOfPoint(int x, int y, int z) {
// returns a cached instance if it is origin, or a new instance
if (isOrigin(x, y, z))
return ORIGIN;
return new Point(x, y, z);
}
@Override
public String toString() {
return "Point{" + "x=" + x + ", y=" + y + ", z=" + z + '}';
}
@Override
public boolean equals(Object other) {
if (other == null || getClass() != other.getClass())
return false;
Point point = (Point) other;
return x == point.x && y == point.y && z == point.z;
}
@Override
public int hashCode() {
return Objects.hash(x, y, z);
}
private static boolean isOrigin(int x, int y, int z) {
return x == 0 && y == 0 && z == 0;
}
}
core-java-modules/core-java-16/src/test/java/com/baeldung/value_based_class/ValueBasedClassUnitTest.java
+44
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@@ -0,0 +1,44 @@
package com.baeldung.value_based_class;
import java.util.ArrayList;
import java.util.List;
import org.junit.Assert;
import org.junit.Test;
public class ValueBasedClassUnitTest {
@Test
public void givenAutoboxedAndPrimitive_whenCompared_thenReturnEquals() {
List<Integer> list = new ArrayList<>();
list.add(1); // this is autoboxed
Assert.assertEquals(list.get(0), Integer.valueOf(1));
}
@Test
public void givenValueBasedPoint_whenCreated_thenReturnsObjects() {
Point p1 = Point.valueOfPoint(1, 2, 3);
Point p2 = Point.valueOfPoint(2, 3, 4);
Assert.assertNotEquals(p1, p2);
}
@Test
public void givenValueBasedPoint_whenCompared_thenReturnEquals() {
Point p1 = Point.valueOfPoint(1, 2, 3);
Point p2 = Point.valueOfPoint(1, 2, 3);
Assert.assertEquals(p1, p2);
}
@Test
public void givenValueBasedPoint_whenOrigin_thenReturnCachedInstance() {
Point p1 = Point.valueOfPoint(0, 0, 0);
Point p2 = Point.valueOfPoint(0, 0, 0);
Point p3 = Point.valueOfPoint(1, 2, 3);
// the following should not be assumed for value-based classes
Assert.assertTrue(p1 == p2);
Assert.assertFalse(p1 == p3);
}
}
core-java-modules/core-java-17/README.md
+1
View File
@@ -7,3 +7,4 @@
- [Random Number Generators in Java 17](https://www.baeldung.com/java-17-random-number-generators)
- [Sealed Classes and Interfaces in Java](https://www.baeldung.com/java-sealed-classes-interfaces)
- [Migrate From Java 8 to Java 17](https://www.baeldung.com/java-migrate-8-to-17)
- [Format Multiple ‘or’ Conditions in an If Statement in Java](https://www.baeldung.com/java-multiple-or-conditions-if-statement)
core-java-modules/core-java-17/src/test/java/com/baeldung/multipleorwithif/MultipleOrWithIfUnitTest.java
+126
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@@ -0,0 +1,126 @@
package com.baeldung.multipleorwithif;
import static java.time.Month.DECEMBER;
import static java.time.Month.NOVEMBER;
import static java.time.Month.OCTOBER;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.in;
import static org.hamcrest.Matchers.is;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.time.Month;
import java.util.List;
import java.util.Random;
import java.util.Set;
import java.util.function.Predicate;
import org.junit.jupiter.api.Test;
class MultipleOrWithIfUnitTest {
private final Random rand = new Random();
final Set<Month> months = Set.of(OCTOBER, NOVEMBER, DECEMBER);
@Test
public void givenIfStatement_whenMultipleOrOperator_thenAssert() {
assertTrue(multipleOrOperatorIf(monthIn()));
assertFalse(multipleOrOperatorIf(monthNotIn()));
}
boolean multipleOrOperatorIf(Month month) {
if (month == OCTOBER || month == NOVEMBER || month == DECEMBER) {
return true;
}
return false;
}
@Test
public void givenSwitch_whenMultipleCase_thenBreakAndAssert() {
assertTrue(switchMonth(monthIn()));
assertFalse(switchMonth(monthNotIn()));
}
boolean switchMonth(Month month) {
return switch (month) {
case OCTOBER, NOVEMBER, DECEMBER -> true;
default -> false;
};
}
@Test
public void givenAllowedValuesList_whenContains_thenAssert() {
assertTrue(contains(monthIn()));
assertFalse(contains(monthNotIn()));
}
@Test
public void givenPredicates_whenTestMultipleOr_thenAssert() {
assertTrue(predicateWithIf(monthIn()));
assertFalse(predicateWithIf(monthNotIn()));
}
@Test
public void givenInputList_whenFilterWithPredicate_thenAssert() {
List<Month> list = List.of(monthIn(), monthIn(), monthNotIn());
list.stream()
.filter(this::predicateWithIf)
.forEach(m -> assertThat(m, is(in(months))));
}
Predicate<Month> orPredicate() {
Predicate<Month> predicate = x -> x == OCTOBER;
Predicate<Month> predicate1 = x -> x == NOVEMBER;
Predicate<Month> predicate2 = x -> x == DECEMBER;
return predicate.or(predicate1)
.or(predicate2);
}
boolean predicateWithIf(Month month) {
if (orPredicate().test(month)) {
return true;
}
return false;
}
@Test
public void givenContainsInSetPredicate_whenTestPredicate_thenAssert() {
Predicate<Month> collectionPredicate = this::contains;
assertTrue(collectionPredicate.test(monthIn()));
assertFalse(collectionPredicate.test(monthNotIn()));
}
@Test
public void givenInputList_whenFilterWithContains_thenAssert() {
List<Month> monthList = List.of(monthIn(), monthIn(), monthNotIn());
monthList.stream()
.filter(this::contains)
.forEach(m -> assertThat(m, is(in(months))));
}
private boolean contains(Month month) {
if (months.contains(month)) {
return true;
}
return false;
}
private Month monthIn() {
return Month.of(rand.ints(10, 13)
.findFirst()
.orElse(10));
}
private Month monthNotIn() {
return Month.of(rand.ints(1, 10)
.findFirst()
.orElse(1));
}
}
core-java-modules/core-java-17/src/test/java/com/baeldung/recordproperties/ReadRecordPropertiesByReflectionUnitTest.java
+89
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@@ -0,0 +1,89 @@
package com.baeldung.recordproperties;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.lang.reflect.Field;
import java.lang.reflect.RecordComponent;
import java.util.ArrayList;
import org.junit.jupiter.api.Test;
record Player(String name, int age, Long score) {
}
public class ReadRecordPropertiesByReflectionUnitTest {
private static final Player ERIC = new Player("Eric", 28, 4242L);
@Test
void whenUsingRecordComponent_thenGetExpectedResult() {
var fields = new ArrayList<Field>();
RecordComponent[] components = Player.class.getRecordComponents();
for (var comp : components) {
try {
Field field = ERIC.getClass()
.getDeclaredField(comp.getName());
field.setAccessible(true);
fields.add(field);
} catch (NoSuchFieldException e) {
// for simplicity, error handling is skipped
}
}
assertEquals(3, fields.size());
var nameField = fields.get(0);
var ageField = fields.get(1);
var scoreField = fields.get(2);
try {
assertEquals("name", nameField.getName());
assertEquals(String.class, nameField.getType());
assertEquals("Eric", nameField.get(ERIC));
assertEquals("age", ageField.getName());
assertEquals(int.class, ageField.getType());
assertEquals(28, ageField.get(ERIC));
assertEquals("score", scoreField.getName());
assertEquals(Long.class, scoreField.getType());
assertEquals(4242L, scoreField.get(ERIC));
} catch (IllegalAccessException exception) {
// for simplicity, error handling is skipped
}
}
@Test
void whenUsingClassGetDeclaredField_thenGetExpectedResult() {
// record has no public fields
assertEquals(0, Player.class.getFields().length);
var fields = new ArrayList<Field>();
for (var field : Player.class.getDeclaredFields()) {
field.setAccessible(true);
fields.add(field);
}
assertEquals(3, fields.size());
var nameField = fields.get(0);
var ageField = fields.get(1);
var scoreField = fields.get(2);
try {
assertEquals("name", nameField.getName());
assertEquals(String.class, nameField.getType());
assertEquals("Eric", nameField.get(ERIC));
assertEquals("age", ageField.getName());
assertEquals(int.class, ageField.getType());
assertEquals(28, ageField.get(ERIC));
assertEquals("score", scoreField.getName());
assertEquals(Long.class, scoreField.getType());
assertEquals(4242L, scoreField.get(ERIC));
} catch (IllegalAccessException ex) {
// for simplicity, error handling is skipped
}
}
}
core-java-modules/core-java-18/README.md
View File
core-java-modules/core-java-18/pom.xml
+55
View File
@@ -0,0 +1,55 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-18</artifactId>
<name>core-java-18</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<forkCount>1</forkCount>
</configuration>
<dependencies>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-api</artifactId>
<version>${surefire.plugin.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>18</maven.compiler.source.version>
<maven.compiler.target.version>18</maven.compiler.target.version>
<maven.compiler.release>18</maven.compiler.release>
<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
</properties>
</project>
core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/FinalizationExamples.java
+27
View File
@@ -0,0 +1,27 @@
package com.baeldung.finalization_closeable_cleaner;
import java.io.FileInputStream;
import java.io.IOException;
public class FinalizationExamples {
FileInputStream fis = null;
public void readFileOperationWithFinalization() throws IOException {
try {
fis = new FileInputStream("input.txt");
// perform operation on the file
System.out.println(fis.readAllBytes().length);
} finally {
if (fis != null)
fis.close();
}
}
public void readFileOperationWithTryWith() throws IOException {
try (FileInputStream fis = new FileInputStream("input.txt")) {
// perform operations
System.out.println(fis.readAllBytes().length);
}
}
}
core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyCleanerResourceClass.java
+48
View File
@@ -0,0 +1,48 @@
package com.baeldung.finalization_closeable_cleaner;
import java.lang.ref.Cleaner;
public class MyCleanerResourceClass implements AutoCloseable {
private static Resource resource;
private static final Cleaner cleaner = Cleaner.create();
private final Cleaner.Cleanable cleanable;
public MyCleanerResourceClass() {
resource = new Resource();
this.cleanable = cleaner.register(this, new CleaningState());
}
public void useResource() {
// using the resource here
resource.use();
}
@Override
public void close() {
// perform actions to close all underlying resources
this.cleanable.clean();
}
static class CleaningState implements Runnable {
CleaningState() {
// constructor
}
@Override
public void run() {
// some cleanup action
System.out.println("Cleanup done");
}
}
static class Resource {
void use() {
System.out.println("Using the resource");
}
void close() {
System.out.println("Cleanup done");
}
}
}
core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyCloseableResourceClass.java
+25
View File
@@ -0,0 +1,25 @@
package com.baeldung.finalization_closeable_cleaner;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class MyCloseableResourceClass implements AutoCloseable {
private final FileInputStream fis;
public MyCloseableResourceClass() throws FileNotFoundException {
this.fis = new FileInputStream("src/main/resources/file.txt");
}
public int getByteLength() throws IOException {
System.out.println("Some operation");
return this.fis.readAllBytes().length;
}
@Override
public void close() throws IOException {
System.out.println("Finalized object");
this.fis.close();
}
}
core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyFinalizableResourceClass.java
+24
View File
@@ -0,0 +1,24 @@
package com.baeldung.finalization_closeable_cleaner;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class MyFinalizableResourceClass {
private FileInputStream fis;
public MyFinalizableResourceClass() throws FileNotFoundException {
this.fis = new FileInputStream("src/main/resources/file.txt");
}
public int getByteLength() throws IOException {
System.out.println("Some operation");
return this.fis.readAllBytes().length;
}
@Override
protected void finalize() throws Throwable {
System.out.println("Finalized object");
this.fis.close();
}
}
core-java-modules/core-java-18/src/main/resources/file.txt
+1
View File
@@ -0,0 +1 @@
This is a test file.
core-java-modules/core-java-18/src/test/java/com/baeldung/finalization_closeable_cleaner/FinalizationCloseableCleanerUnitTest.java
+36
View File
@@ -0,0 +1,36 @@
package com.baeldung.finalization_closeable_cleaner;
import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
import java.io.IOException;
import org.junit.Assert;
import org.junit.Test;
public class FinalizationCloseableCleanerUnitTest {
@Test
public void givenMyFinalizationResource_whenUsingFinalize_thenShouldClean() {
assertDoesNotThrow(() -> {
MyFinalizableResourceClass mfr = new MyFinalizableResourceClass();
mfr.getByteLength();
});
}
@Test
public void givenMyCleanerResource_whenUsingCleanerAPI_thenShouldClean() {
assertDoesNotThrow(() -> {
try (MyCleanerResourceClass myCleanerResourceClass = new MyCleanerResourceClass()) {
myCleanerResourceClass.useResource();
}
});
}
@Test
public void givenCloseableResource_whenUsingTryWith_thenShouldClose() throws IOException {
int length = 0;
try (MyCloseableResourceClass mcr = new MyCloseableResourceClass()) {
length = mcr.getByteLength();
}
Assert.assertEquals(20, length);
}
}
core-java-modules/core-java-21/README.md
+5
View File
@@ -0,0 +1,5 @@
## Relevant Articles
- [Sequenced Collections in Java 21](https://www.baeldung.com/java-21-sequenced-collections)
- [String Templates in Java 21](https://www.baeldung.com/java-21-string-templates)
- [Unnamed Classes and Instance Main Methods in Java 21](https://www.baeldung.com/java-21-unnamed-class-instance-main)
- [Unnamed Patterns and Variables in Java 21](https://www.baeldung.com/java-unnamed-patterns-variables)
core-java-modules/core-java-21/pom.xml
+47
View File
@@ -0,0 +1,47 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-21</artifactId>
<name>core-java-21</name>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>21</source>
<target>21</target>
<!-- Needed due to a bug with JDK 21, described here: https://issues.apache.org/jira/browse/MCOMPILER-546?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&focusedCommentId=17767513 -->
<debug>false</debug>
<compilerArgs>
<arg>--enable-preview</arg>
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>21</maven.compiler.source.version>
<maven.compiler.target.version>21</maven.compiler.target.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

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