merge code for testing

core-java-modules/core-java-8/src/main/java/com/ossez/game/RockPaperScissorsGame.java

@@ -0,0 +1,73 @@
+package com.ossez.game;
+
+import java.util.*;
+
+class RockPaperScissorsGame {
+
+    enum Move {
+        ROCK("rock"),
+        PAPER("paper"),
+        SCISSORS("scissors");
+
+        private String value;
+
+        Move(String value) {
+            this.value = value;
+        }
+
+        public String getValue() {
+            return value;
+        }
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int wins = 0;
+        int losses = 0;
+
+        System.out.println("Welcome to Rock-Paper-Scissors! Please enter \"rock\", \"paper\", \"scissors\", or \"quit\" to exit.");
+
+        while (true) {
+            System.out.println("-------------------------");
+            System.out.print("Enter your move: ");
+            String playerMove = scanner.nextLine();
+
+            if (playerMove.equals("quit")) {
+                System.out.println("You won " + wins + " times and lost " + losses + " times.");
+                System.out.println("Thanks for playing! See you again.");
+                break;
+            }
+
+            if (Arrays.stream(Move.values()).noneMatch(x -> x.getValue().equals(playerMove))) {
+                System.out.println("Your move isn't valid!");
+                continue;
+            }
+
+            String computerMove = getComputerMove();
+
+            if (playerMove.equals(computerMove)) {
+                System.out.println("It's a tie!");
+            } else if (isPlayerWin(playerMove, computerMove)) {
+                System.out.println("You won!");
+                wins++;
+            } else {
+                System.out.println("You lost!");
+                losses++;
+            }
+        }
+    }
+
+    private static boolean isPlayerWin(String playerMove, String computerMove) {
+        return playerMove.equals(Move.ROCK.value) && computerMove.equals(Move.SCISSORS.value)
+                || (playerMove.equals(Move.SCISSORS.value) && computerMove.equals(Move.PAPER.value))
+                || (playerMove.equals(Move.PAPER.value) && computerMove.equals(Move.ROCK.value));
+    }
+
+    private static String getComputerMove() {
+        Random random = new Random();
+        int randomNumber = random.nextInt(3);
+        String computerMove = Move.values()[randomNumber].getValue();
+        System.out.println("Computer move: " + computerMove);
+        return computerMove;
+    }
+}

core-java-modules/core-java-8/src/main/java/com/ossez/interfaceVsAbstractClass/ChidlCircleInterfaceImpl.java

@@ -0,0 +1,14 @@
+package com.ossez.interfaceVsAbstractClass;
+
+public class ChidlCircleInterfaceImpl implements CircleInterface {
+    private String color;
+
+    @Override
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+}

core-java-modules/core-java-8/src/main/java/com/ossez/interfaceVsAbstractClass/ChildCircleClass.java

@@ -0,0 +1,5 @@
+package com.ossez.interfaceVsAbstractClass;
+
+public class ChildCircleClass extends CircleClass {
+
+}

core-java-modules/core-java-8/src/main/java/com/ossez/interfaceVsAbstractClass/CircleClass.java

@@ -0,0 +1,23 @@
+package com.ossez.interfaceVsAbstractClass;
+
+import java.util.Arrays;
+import java.util.List;
+
+public abstract class CircleClass {
+
+    private String color;
+    private List<String> allowedColors = Arrays.asList("RED", "GREEN", "BLUE");
+
+    public boolean isValid() {
+        return allowedColors.contains(getColor());
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+}

core-java-modules/core-java-8/src/main/java/com/ossez/interfaceVsAbstractClass/CircleInterface.java

@@ -0,0 +1,14 @@
+package com.ossez.interfaceVsAbstractClass;
+
+import java.util.Arrays;
+import java.util.List;
+
+public interface CircleInterface {
+    List<String> allowedColors = Arrays.asList("RED", "GREEN", "BLUE");
+
+    String getColor();
+
+    public default boolean isValid() {
+        return allowedColors.contains(getColor());
+    }
+}

core-java-modules/core-java-8/src/main/java/com/ossez/jarArguments/JarExample.java

@@ -0,0 +1,18 @@
+package com.ossez.jarArguments;
+
+public class JarExample {
+
+    public static void main(String[] args) {
+        System.out.println("Hello Baeldung Reader in JarExample!");
+        
+        if(args == null) {
+            System.out.println("You have not provided any arguments!");
+        }else {
+            System.out.println("There are "+args.length+" argument(s)!");
+            for(int i=0; i<args.length; i++) {
+                System.out.println("Argument("+(i+1)+"):" + args[i]);
+            }
+        }
+    }
+
+}

core-java-modules/core-java-8/src/main/java/com/ossez/localization/App.java

@@ -0,0 +1,20 @@
+package com.ossez.localization;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+
+public class App {
+    /**
+     * Runs all available formatter
+     *
+     * @param args
+     */
+    public static void main(String[] args) {
+        List<Locale> locales = Arrays.asList(new Locale[]{Locale.UK, Locale.ITALY, Locale.FRANCE, Locale.forLanguageTag("pl-PL")});
+        Localization.run(locales);
+        JavaSEFormat.run(locales);
+        ICUFormat.run(locales);
+    }
+
+}

core-java-modules/core-java-8/src/main/java/com/ossez/localization/ICUFormat.java

@@ -0,0 +1,29 @@
+package com.ossez.localization;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.ResourceBundle;
+
+import com.ibm.icu.text.MessageFormat;
+
+public class ICUFormat {
+
+    public static String getLabel(Locale locale, Object[] data) {
+        ResourceBundle bundle = ResourceBundle.getBundle("formats", locale);
+        String format = bundle.getString("label-icu");
+        MessageFormat formatter = new MessageFormat(format, locale);
+        return formatter.format(data);
+    }
+
+    public static void run(List<Locale> locales) {
+        System.out.println("ICU formatter");
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 0 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 1 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 2 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 3 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 0 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 1 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 2 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 3 })));
+    }
+}

core-java-modules/core-java-8/src/main/java/com/ossez/localization/JavaSEFormat.java

@@ -0,0 +1,24 @@
+package com.ossez.localization;
+
+import java.text.MessageFormat;
+import java.util.Date;
+import java.util.List;
+import java.util.Locale;
+import java.util.ResourceBundle;
+
+public class JavaSEFormat {
+
+    public static String getLabel(Locale locale, Object[] data) {
+        ResourceBundle bundle = ResourceBundle.getBundle("formats", locale);
+        final String pattern = bundle.getString("label");
+        final MessageFormat formatter = new MessageFormat(pattern, locale);
+        return formatter.format(data);
+    }
+
+    public static void run(List<Locale> locales) {
+        System.out.println("Java formatter");
+        final Date date = new Date(System.currentTimeMillis());
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { date, "Alice", 0 })));
+        locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { date, "Alice", 2 })));
+    }
+}

core-java-modules/core-java-8/src/main/java/com/ossez/localization/Localization.java

@@ -0,0 +1,18 @@
+package com.ossez.localization;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.ResourceBundle;
+
+public class Localization {
+
+    public static String getLabel(Locale locale) {
+        final ResourceBundle bundle = ResourceBundle.getBundle("messages", locale);
+        return bundle.getString("label");
+    }
+
+    public static void run(List<Locale> locales) {
+        locales.forEach(locale -> System.out.println(getLabel(locale)));
+    }
+
+}

core-java-modules/core-java-8/src/main/java/com/ossez/stream/SkipLimitComparison.java

@@ -0,0 +1,46 @@
+package com.ossez.stream;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class SkipLimitComparison {
+
+    public static void main(String[] args) {
+        skipExample();
+        limitExample();
+        limitInfiniteStreamExample();
+        getEvenNumbers(10, 10).stream()
+            .forEach(System.out::println);
+    }
+
+    public static void skipExample() {
+        Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
+            .filter(i -> i % 2 == 0)
+            .skip(2)
+            .forEach(i -> System.out.print(i + " "));
+    }
+
+    public static void limitExample() {
+        Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
+            .filter(i -> i % 2 == 0)
+            .limit(2)
+            .forEach(i -> System.out.print(i + " "));
+    }
+
+    public static void limitInfiniteStreamExample() {
+        Stream.iterate(0, i -> i + 1)
+            .filter(i -> i % 2 == 0)
+            .limit(10)
+            .forEach(System.out::println);
+    }
+
+    private static List<Integer> getEvenNumbers(int offset, int limit) {
+        return Stream.iterate(0, i -> i + 1)
+            .filter(i -> i % 2 == 0)
+            .skip(offset)
+            .limit(limit)
+            .collect(Collectors.toList());
+    }
+
+}

core-java-modules/core-java-8/src/main/java/com/ossez/uuid/UuidHelper.java

@@ -0,0 +1,33 @@
+package com.ossez.uuid;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.UUID;
+
+public class UuidHelper {
+
+    public static byte[] convertUUIDToBytes(UUID uuid) {
+        ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
+        bb.putLong(uuid.getMostSignificantBits());
+        bb.putLong(uuid.getLeastSignificantBits());
+        return bb.array();
+    }
+
+    public static UUID convertBytesToUUID(byte[] bytes) {
+        ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+        long high = byteBuffer.getLong();
+        long low = byteBuffer.getLong();
+        return new UUID(high, low);
+    }
+
+    public static void main(String[] args) {
+        UUID uuid = UUID.randomUUID();
+        System.out.println("Original UUID: " + uuid);
+
+        byte[] bytes = convertUUIDToBytes(uuid);
+        System.out.println("Converted byte array: " + Arrays.toString(bytes));
+
+        UUID uuidNew = convertBytesToUUID(bytes);
+        System.out.println("Converted UUID: " + uuidNew);
+    }
+}

core-java-modules/core-java-8/src/main/resources/META-INF/persistence.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<persistence xmlns="http://java.sun.com/xml/ns/persistence"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
+	version="2.0">
+
+	<persistence-unit
+		name="com.baeldung.optionalreturntype"
+		transaction-type="RESOURCE_LOCAL">
+		<description>Persist Optional Return Type Demo</description>
+		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+		<class>com.baeldung.optionalreturntype.User</class>
+		<class>com.baeldung.optionalreturntype.UserOptional</class>
+		<!-- 
+		<class>com.baeldung.optionalreturntype.UserOptionalField</class>
+		-->
+		<exclude-unlisted-classes>true</exclude-unlisted-classes>
+
+		<properties>
+			<property name="javax.persistence.jdbc.driver"
+				value="org.h2.Driver" />
+			<property name="javax.persistence.jdbc.url"
+				value="jdbc:h2:mem:test" />
+			<property name="javax.persistence.jdbc.user" value="sa" />
+			<property name="javax.persistence.jdbc.password" value="" />
+			<property name="hibernate.dialect"
+				value="org.hibernate.dialect.H2Dialect" />
+			<property name="hibernate.hbm2ddl.auto" value="create-drop" />
+			<property name="show_sql" value="true" />
+			<property name="hibernate.temp.use_jdbc_metadata_defaults"
+				value="false" />
+		</properties>
+	</persistence-unit>
+</persistence>

core-java-modules/core-java-8/src/main/resources/formats_en.properties

@@ -0,0 +1,2 @@
+label=On {0, date, short} {1} has sent you {2, choice, 0#no messages|1#a message|2#two messages|2<{2,number,integer} messages}.
+label-icu={0} has sent you {2, plural, =0 {no messages} =1 {a message} other {{2, number, integer} messages}}.

core-java-modules/core-java-8/src/main/resources/formats_fr.properties

@@ -0,0 +1,2 @@
+label={0, date, short}, {1}{2, choice, 0# ne|0<} vous a envoyé {2, choice, 0#aucun message|1#un message|2#deux messages|2<{2,number,integer} messages}.
+label-icu={0} {2, plural, =0 {ne } other {}}vous a envoyé {2, plural, =0 {aucun message} =1 {un message} other {{2, number, integer} messages}}.

core-java-modules/core-java-8/src/main/resources/formats_it.properties

@@ -0,0 +1,2 @@
+label={0, date, short} {1} ti ha inviato {2, choice, 0#nessun messagio|1#un messaggio|2#due messaggi|2<{2, number, integer} messaggi}.
+label-icu={0} {2, plural, =0 {non } other {}}ti ha inviato {2, plural, =0 {nessun messaggio} =1 {un messaggio} other {{2, number, integer} messaggi}}.

core-java-modules/core-java-8/src/main/resources/formats_pl.properties

@@ -0,0 +1,2 @@
+label=W {0, date, short} {1}{2, choice, 0# nie|0<} wys\u0142a\u0142a ci {2, choice, 0#\u017Cadnych wiadomo\u015Bci|1#wiadomo\u015B\u0107|2#dwie wiadomo\u015Bci|2<{2, number, integer} wiadomo\u015Bci}.
+label-icu={0} {2, plural, =0 {nie } other {}}{1, select, male {wys\u0142a\u0142} female {wys\u0142a\u0142a} other {wys\u0142a\u0142o}} ci {2, plural, =0 {\u017Cadnej wiadomo\u015Bci} =1 {wiadomo\u015B\u0107} other {{2, number, integer} wiadomo\u015Bci}}.

core-java-modules/core-java-8/src/main/resources/messages_en.properties

@@ -0,0 +1 @@
+label=Alice has sent you a message.

core-java-modules/core-java-8/src/main/resources/messages_fr.properties

@@ -0,0 +1 @@
+label=Alice vous a envoyé un message.

core-java-modules/core-java-8/src/main/resources/messages_it.properties

@@ -0,0 +1 @@
+label=Alice ti ha inviato un messaggio.

core-java-modules/core-java-8/src/main/resources/messages_pl.properties

@@ -0,0 +1 @@
+label=Alice wys\u0142a\u0142a ci wiadomo\u015B\u0107.