Merge branch 'master' of https://github.com/eugenp/tutorials

algorithms-miscellaneous-5/pom.xml

@@ -17,6 +17,11 @@
             <artifactId>commons-codec</artifactId>
             <version>${commons-codec.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-math3</artifactId>
+            <version>${commons-math3.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
@@ -28,6 +33,7 @@
             <artifactId>tradukisto</artifactId>
             <version>${tradukisto.version}</version>
         </dependency>
+
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -52,6 +58,7 @@
         <tradukisto.version>1.0.1</tradukisto.version>
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
         <commons-codec.version>1.11</commons-codec.version>
+        <commons-math3.version>3.6.1</commons-math3.version>
     </properties>
 
 </project>

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/caesarcipher/CaesarCipher.java

@@ -0,0 +1,83 @@
+package com.baeldung.algorithms.caesarcipher;
+
+import org.apache.commons.math3.stat.inference.ChiSquareTest;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+
+public class CaesarCipher {
+    private static final char LETTER_A = 'a';
+    private static final char LETTER_Z = 'z';
+    private static final int ALPHABET_SIZE = LETTER_Z - LETTER_A + 1;
+    private static final double[] ENGLISH_LETTERS_PROBABILITIES = {0.073, 0.009, 0.030, 0.044, 0.130, 0.028, 0.016, 0.035, 0.074, 0.002, 0.003, 0.035, 0.025, 0.078, 0.074, 0.027, 0.003, 0.077, 0.063, 0.093, 0.027, 0.013, 0.016, 0.005, 0.019, 0.001};
+
+    public String cipher(String message, int offset) {
+        StringBuilder result = new StringBuilder();
+
+        for (char character : message.toCharArray()) {
+            if (character != ' ') {
+                int originalAlphabetPosition = character - LETTER_A;
+                int newAlphabetPosition = (originalAlphabetPosition + offset) % ALPHABET_SIZE;
+                char newCharacter = (char) (LETTER_A + newAlphabetPosition);
+                result.append(newCharacter);
+            } else {
+                result.append(character);
+            }
+        }
+
+        return result.toString();
+    }
+
+    public String decipher(String message, int offset) {
+        return cipher(message, ALPHABET_SIZE - (offset % ALPHABET_SIZE));
+    }
+
+    public int breakCipher(String message) {
+        return probableOffset(chiSquares(message));
+    }
+
+    private double[] chiSquares(String message) {
+        double[] expectedLettersFrequencies = expectedLettersFrequencies(message.length());
+
+        double[] chiSquares = new double[ALPHABET_SIZE];
+
+        for (int offset = 0; offset < chiSquares.length; offset++) {
+            String decipheredMessage = decipher(message, offset);
+            long[] lettersFrequencies = observedLettersFrequencies(decipheredMessage);
+            double chiSquare = new ChiSquareTest().chiSquare(expectedLettersFrequencies, lettersFrequencies);
+            chiSquares[offset] = chiSquare;
+        }
+
+        return chiSquares;
+    }
+
+    private long[] observedLettersFrequencies(String message) {
+        return IntStream.rangeClosed(LETTER_A, LETTER_Z)
+          .mapToLong(letter -> countLetter((char) letter, message))
+          .toArray();
+    }
+
+    private long countLetter(char letter, String message) {
+        return message.chars()
+          .filter(character -> character == letter)
+          .count();
+    }
+
+    private double[] expectedLettersFrequencies(int messageLength) {
+        return Arrays.stream(ENGLISH_LETTERS_PROBABILITIES)
+          .map(probability -> probability * messageLength)
+          .toArray();
+    }
+
+    private int probableOffset(double[] chiSquares) {
+        int probableOffset = 0;
+        for (int offset = 0; offset < chiSquares.length; offset++) {
+            System.out.println(String.format("Chi-Square for offset %d: %.2f", offset, chiSquares[offset]));
+            if (chiSquares[offset] < chiSquares[probableOffset]) {
+                probableOffset = offset;
+            }
+        }
+
+        return probableOffset;
+    }
+}

algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/caesarcipher/CaesarCipherUnitTest.java

@@ -0,0 +1,83 @@
+package com.baeldung.algorithms.caesarcipher;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CaesarCipherUnitTest {
+    private static final String SENTENCE = "he told me i could never teach a llama to drive";
+    private static final String SENTENCE_SHIFTED_THREE = "kh wrog ph l frxog qhyhu whdfk d oodpd wr gulyh";
+    private static final String SENTENCE_SHIFTED_TEN = "ro dyvn wo s myevn xofob dokmr k vvkwk dy nbsfo";
+
+    private CaesarCipher algorithm = new CaesarCipher();
+
+    @Test
+    void givenSentenceAndShiftThree_whenCipher_thenCipheredMessageWithoutOverflow() {
+        String cipheredSentence = algorithm.cipher(SENTENCE, 3);
+
+        assertThat(cipheredSentence)
+          .isEqualTo(SENTENCE_SHIFTED_THREE);
+    }
+
+    @Test
+    void givenSentenceAndShiftTen_whenCipher_thenCipheredMessageWithOverflow() {
+        String cipheredSentence = algorithm.cipher(SENTENCE, 10);
+
+        assertThat(cipheredSentence)
+          .isEqualTo(SENTENCE_SHIFTED_TEN);
+    }
+
+    @Test
+    void givenSentenceAndShiftThirtySix_whenCipher_thenCipheredLikeTenMessageWithOverflow() {
+        String cipheredSentence = algorithm.cipher(SENTENCE, 36);
+
+        assertThat(cipheredSentence)
+          .isEqualTo(SENTENCE_SHIFTED_TEN);
+    }
+
+    @Test
+    void givenSentenceShiftedThreeAndShiftThree_whenDecipher_thenOriginalSentenceWithoutOverflow() {
+        String decipheredSentence = algorithm.decipher(SENTENCE_SHIFTED_THREE, 3);
+
+        assertThat(decipheredSentence)
+          .isEqualTo(SENTENCE);
+    }
+
+    @Test
+    void givenSentenceShiftedTenAndShiftTen_whenDecipher_thenOriginalSentenceWithOverflow() {
+        String decipheredSentence = algorithm.decipher(SENTENCE_SHIFTED_TEN, 10);
+
+        assertThat(decipheredSentence)
+          .isEqualTo(SENTENCE);
+    }
+
+    @Test
+    void givenSentenceShiftedTenAndShiftThirtySix_whenDecipher_thenOriginalSentenceWithOverflow() {
+        String decipheredSentence = algorithm.decipher(SENTENCE_SHIFTED_TEN, 36);
+
+        assertThat(decipheredSentence)
+          .isEqualTo(SENTENCE);
+    }
+
+    @Test
+    void givenSentenceShiftedThree_whenBreakCipher_thenOriginalSentence() {
+        int offset = algorithm.breakCipher(SENTENCE_SHIFTED_THREE);
+
+        assertThat(offset)
+          .isEqualTo(3);
+
+        assertThat(algorithm.decipher(SENTENCE_SHIFTED_THREE, offset))
+          .isEqualTo(SENTENCE);
+    }
+
+    @Test
+    void givenSentenceShiftedTen_whenBreakCipher_thenOriginalSentence() {
+        int offset = algorithm.breakCipher(SENTENCE_SHIFTED_TEN);
+
+        assertThat(offset)
+          .isEqualTo(10);
+
+        assertThat(algorithm.decipher(SENTENCE_SHIFTED_TEN, offset))
+          .isEqualTo(SENTENCE);
+    }
+}

core-java-modules/core-java-date-operations/src/test/java/com/baeldung/datetime/sql/TimeUtilsUnitTest.java

@@ -7,15 +7,9 @@ import org.junit.Test;
 import com.baeldung.datetime.sql.TimeUtils;
 
 import java.text.ParseException;
-import java.util.Date;
 
 public class TimeUtilsUnitTest {
 
-    @Test
-    public void givenCurrentTime_thenNowIsReturned() {
-        assertEquals(TimeUtils.getNow(), new Date());
-    }
-
     @Test(expected = IllegalArgumentException.class)
     public void givenTimeAsString_whenPatternIsNotRespected_thenExceptionIsThrown() {
         TimeUtils.getTime("10 11 12");

core-java-modules/core-java-io-2/.gitignore

@@ -1,3 +1,5 @@
-# Intellij
-.idea/
-*.iml
+0.*
+
+# Files generated by integration tests
+# *.txt
+/temp

core-java-modules/core-java-io-2/README.md

@@ -1,4 +1,15 @@
+## Core Java IO
 
-### Relevant Articles:
+This module contains articles about core Java input and output (IO)
 
+### Relevant Articles: 
 - [Create a File in a Specific Directory in Java](https://www.baeldung.com/java-create-file-in-directory)
+- [How to Read a Large File Efficiently with Java](https://www.baeldung.com/java-read-lines-large-file)
+- [Java – Write to File](https://www.baeldung.com/java-write-to-file)
+- [FileNotFoundException in Java](https://www.baeldung.com/java-filenotfound-exception)
+- [Delete the Contents of a File in Java](https://www.baeldung.com/java-delete-file-contents)
+- [List Files in a Directory in Java](https://www.baeldung.com/java-list-directory-files)
+- [Java – Append Data to a File](https://www.baeldung.com/java-append-to-file)
+- [How to Copy a File with Java](https://www.baeldung.com/java-copy-file)
+- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
+- [[<-- Prev]](/core-java-modules/core-java-io)

core-java-modules/core-java-io-2/pom.xml

@@ -16,57 +16,16 @@
     <dependencies>
         <!-- utils -->
         <dependency>
-            <groupId>net.sourceforge.collections</groupId>
-            <artifactId>collections-generic</artifactId>
-            <version>${collections-generic.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-collections4</artifactId>
-            <version>${commons-collections4.version}</version>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
         </dependency>
+        <!-- utils -->
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
             <version>${commons-io.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-math3</artifactId>
-            <version>${commons-math3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.decimal4j</groupId>
-            <artifactId>decimal4j</artifactId>
-            <version>${decimal4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.bouncycastle</groupId>
-            <artifactId>bcprov-jdk15on</artifactId>
-            <version>${bouncycastle.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.unix4j</groupId>
-            <artifactId>unix4j-command</artifactId>
-            <version>${unix4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.googlecode.grep4j</groupId>
-            <artifactId>grep4j</artifactId>
-            <version>${grep4j.version}</version>
-        </dependency>
-        <!-- web -->
-        <!-- marshalling -->
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-            <version>${jackson.version}</version>
-        </dependency>
         <!-- logging -->
         <dependency>
             <groupId>log4j</groupId>
@@ -78,12 +37,6 @@
             <artifactId>log4j-over-slf4j</artifactId>
             <version>${org.slf4j.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.projectlombok</groupId>
-            <artifactId>lombok</artifactId>
-            <version>${lombok.version}</version>
-            <scope>provided</scope>
-        </dependency>
         <!-- test scoped -->
         <dependency>
             <groupId>org.assertj</groupId>
@@ -91,86 +44,6 @@
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>com.jayway.awaitility</groupId>
-            <artifactId>awaitility</artifactId>
-            <version>${avaitility.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>commons-codec</groupId>
-            <artifactId>commons-codec</artifactId>
-            <version>${commons-codec.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.javamoney</groupId>
-            <artifactId>moneta</artifactId>
-            <version>${moneta.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.owasp.esapi</groupId>
-            <artifactId>esapi</artifactId>
-            <version>${esapi.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.sun.messaging.mq</groupId>
-            <artifactId>fscontext</artifactId>
-            <version>${fscontext.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.codepoetics</groupId>
-            <artifactId>protonpack</artifactId>
-            <version>${protonpack.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>one.util</groupId>
-            <artifactId>streamex</artifactId>
-            <version>${streamex.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>io.vavr</groupId>
-            <artifactId>vavr</artifactId>
-            <version>${vavr.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>${jmh-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh-generator-annprocess.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.hsqldb</groupId>
-            <artifactId>hsqldb</artifactId>
-            <version>${hsqldb.version}</version>
-            <scope>runtime</scope>
-        </dependency>
-        <!-- https://mvnrepository.com/artifact/org.asynchttpclient/async-http-client -->
-        <dependency>
-            <groupId>org.asynchttpclient</groupId>
-            <artifactId>async-http-client</artifactId>
-            <version>${async-http-client.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.opencsv</groupId>
-            <artifactId>opencsv</artifactId>
-            <version>${opencsv.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <!-- Mime Type Resolution Libraries -->
-        <dependency>
-            <groupId>org.apache.tika</groupId>
-            <artifactId>tika-core</artifactId>
-            <version>${tika.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>net.sf.jmimemagic</groupId>
-            <artifactId>jmimemagic</artifactId>
-            <version>${jmime-magic.version}</version>
-        </dependency>
     </dependencies>
 
     <build>
@@ -182,22 +55,6 @@
             </resource>
         </resources>
         <plugins>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>exec-maven-plugin</artifactId>
-                <version>${exec-maven-plugin.version}</version>
-                <configuration>
-                    <executable>java</executable>
-                    <mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass>
-                    <arguments>
-                        <argument>-Xmx300m</argument>
-                        <argument>-XX:+UseParallelGC</argument>
-                        <argument>-classpath</argument>
-                        <classpath />
-                        <argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
-                    </arguments>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
@@ -210,70 +67,9 @@
         </plugins>
     </build>
 
-    <profiles>
-        <profile>
-            <id>integration</id>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.codehaus.mojo</groupId>
-                        <artifactId>exec-maven-plugin</artifactId>
-
-                        <executions>
-                            <execution>
-                                <id>run-benchmarks</id>
-                                <!-- <phase>integration-test</phase> -->
-                                <phase>none</phase>
-                                <goals>
-                                    <goal>exec</goal>
-                                </goals>
-                                <configuration>
-                                    <classpathScope>test</classpathScope>
-                                    <executable>java</executable>
-                                    <arguments>
-                                        <argument>-classpath</argument>
-                                        <classpath />
-                                        <argument>org.openjdk.jmh.Main</argument>
-                                        <argument>.*</argument>
-                                    </arguments>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
-    </profiles>
-
     <properties>
-
-        <!-- util -->
-        <bouncycastle.version>1.55</bouncycastle.version>
-        <commons-codec.version>1.10</commons-codec.version>
-        <commons-math3.version>3.6.1</commons-math3.version>
-        <decimal4j.version>1.0.3</decimal4j.version>
-        <commons-collections4.version>4.1</commons-collections4.version>
-        <collections-generic.version>4.01</collections-generic.version>
-        <unix4j.version>0.4</unix4j.version>
-        <grep4j.version>1.8.7</grep4j.version>
-        <fscontext.version>4.6-b01</fscontext.version>
-        <protonpack.version>1.13</protonpack.version>
-        <streamex.version>0.6.5</streamex.version>
-        <vavr.version>0.9.0</vavr.version>
-        <opencsv.version>4.1</opencsv.version>
-        <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
-        <avaitility.version>1.7.0</avaitility.version>
-
-        <!-- maven plugins -->
         <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
-        <hsqldb.version>2.4.0</hsqldb.version>
-        <esapi.version>2.1.0.1</esapi.version>
-        <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
-        <async-http-client.version>2.4.5</async-http-client.version>
-        <!-- Mime Type Libraries -->
-        <tika.version>1.18</tika.version>
-        <jmime-magic.version>0.1.5</jmime-magic.version>
     </properties>
 
 </project>

core-java-modules/core-java-io-2/src/main/java/com/baeldung/listfiles/ListFiles.java

@@ -1,4 +1,4 @@
-package com.baeldung.files;
+package com.baeldung.listfiles;
 
 import java.io.File;
 import java.io.IOException;

core-java-modules/core-java-io-2/src/test/java/com/baeldung/appendtofile/AppendToFileManualTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.file;
+package com.baeldung.appendtofile;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -22,9 +22,7 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
-import com.baeldung.util.StreamUtils;
-
-public class FilesManualTest {
+public class AppendToFileManualTest {
 
     public static final String fileName = "src/main/resources/countries.properties";
 

core-java-modules/core-java-io-2/src/test/java/com/baeldung/appendtofile/StreamUtils.java

@@ -1,11 +1,11 @@
-package com.baeldung.util;
+package com.baeldung.appendtofile;
+
+import org.apache.commons.io.IOUtils;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.StringWriter;
 
-import org.apache.commons.io.IOUtils;
-
 public class StreamUtils {
 
     public static String getStringFromInputStream(InputStream input) throws IOException {

core-java-modules/core-java-io-2/src/test/java/com/baeldung/createfiles/CreateFilesUnitTest.java

@@ -5,15 +5,27 @@ import org.junit.Test;
 
 import java.io.File;
 import java.io.IOException;
-
+import org.junit.BeforeClass;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 public class CreateFilesUnitTest {
+
+    @BeforeClass
+    public static void clean() {
+        File tempDirectory = new File(System.getProperty("java.io.tmpdir"));
+        File file1 = new File(tempDirectory.getAbsolutePath() + "/testFile.txt");
+        File file2 = new File(tempDirectory, "newFile.txt");
+        File file3 = new File(tempDirectory.getAbsolutePath() + File.separator + "newFile2.txt");
+        file1.delete();
+        file2.delete();
+        file3.delete();
+    }
+
     @Test
     public void givenAnExistingDirectory_whenCreatingAFileWithAbsolutePath_thenFileIsCreated() throws IOException {
         File tempDirectory = new File(System.getProperty("java.io.tmpdir"));
-        File fileWithAbsolutePath = new File(tempDirectory.getAbsolutePath() + "/myDirectory/testFile.txt");
+        File fileWithAbsolutePath = new File(tempDirectory.getAbsolutePath() + "/testFile.txt");
 
         assertFalse(fileWithAbsolutePath.exists());
 
@@ -25,7 +37,7 @@ public class CreateFilesUnitTest {
     @Test
     public void givenAnExistingDirectory_whenCreatingANewDirectoryAndFileWithRelativePath_thenFileIsCreated() throws IOException {
         File tempDirectory = new File(System.getProperty("java.io.tmpdir"));
-        File fileWithRelativePath = new File(tempDirectory, "myDirectory/newFile.txt");
+        File fileWithRelativePath = new File(tempDirectory, "newFile.txt");
 
         assertFalse(fileWithRelativePath.exists());
 
@@ -37,7 +49,7 @@ public class CreateFilesUnitTest {
     @Test
     public void whenCreatingAFileWithFileSeparator_thenFileIsCreated() throws IOException {
         File tempDirectory = new File(System.getProperty("java.io.tmpdir"));
-        File newFile = new File(tempDirectory.getAbsolutePath() + File.separator + "newFile.txt");
+        File newFile = new File(tempDirectory.getAbsolutePath() + File.separator + "newFile2.txt");
 
         assertFalse(newFile.exists());
 

core-java-modules/core-java-io-2/src/test/java/com/baeldung/deletecontents/FilesClearDataUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.file;
+package com.baeldung.deletecontents;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
@@ -20,8 +20,6 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
-import com.baeldung.util.StreamUtils;
-
 public class FilesClearDataUnitTest {
 	
     public static final String FILE_PATH = "src/test/resources/fileexample.txt";

core-java-modules/core-java-io-2/src/test/java/com/baeldung/deletecontents/StreamUtils.java

@@ -0,0 +1,16 @@
+package com.baeldung.deletecontents;
+
+import org.apache.commons.io.IOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringWriter;
+
+public class StreamUtils {
+
+    public static String getStringFromInputStream(InputStream input) throws IOException {
+        StringWriter writer = new StringWriter();
+        IOUtils.copy(input, writer, "UTF-8");
+        return writer.toString();
+    }
+}

core-java-modules/core-java-io-2/src/test/java/com/baeldung/filenotfoundexception/FileNotFoundExceptionUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.core.exceptions;
+package com.baeldung.filenotfoundexception;
 
 import org.junit.Test;
 import org.slf4j.Logger;

core-java-modules/core-java-io-2/src/test/java/com/baeldung/listfiles/ListFilesUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.file;
+package com.baeldung.listfiles;
 
 import static org.junit.Assert.assertEquals;
 
@@ -8,7 +8,7 @@ import java.util.Set;
 
 import org.junit.Test;
 
-import com.baeldung.files.ListFiles;
+import com.baeldung.listfiles.ListFiles;
 
 public class ListFilesUnitTest {
 

core-java-modules/core-java-io-2/src/test/java/com/baeldung/readlargefile/ReadLargeFileUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java;
+package com.baeldung.readlargefile;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -16,7 +16,7 @@ import com.google.common.base.Charsets;
 import com.google.common.io.Files;
 
 @Ignore("need large file for testing")
-public class JavaIoUnitTest {
+public class ReadLargeFileUnitTest {
     protected final Logger logger = LoggerFactory.getLogger(getClass());
 
     // tests - iterate lines in a file

core-java-modules/core-java-io-2/src/test/java/com/baeldung/writetofile/JavaWriteToFileUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.writetofile;
+package com.baeldung.writetofile;
 
 import static org.junit.Assert.assertEquals;
 

core-java-modules/core-java-io-2/src/test/resources/HelloWorld.txt

@@ -1 +0,0 @@
-Hello, World!