Merge branch 'eugenp:master' into master

Author: vshanbha

core-java-modules/core-java-collections-7/src/main/java/com/baeldung/PrintStack.java

@@ -2,6 +2,7 @@
 
 import java.util.ArrayDeque;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.Deque;
 import java.util.Iterator;
@@ -42,13 +43,12 @@ public static void givenStack_whenUsingDirectForEach_thenPrintStack() {
 
     public static void givenStack_whenUsingStreamReverse_thenPrintStack() {
         Stack<Integer> stack = new Stack<>();
-        stack.push(10);
         stack.push(20);
+        stack.push(10);
         stack.push(30);
 
-        stack.stream()
-            .sorted(Comparator.reverseOrder())
-            .forEach(System.out::println);
+        Collections.reverse(stack);
+        stack.forEach(System.out::println);
     }
 
     public static void givenStack_whenUsingIterator_thenPrintStack() {

core-java-modules/core-java-collections-7/src/test/java/com/baeldung/printstack/PrintStackUnitTest.java

@@ -30,7 +30,7 @@ void givenStack_whenUsingDirectForEach_thenPrintStack() throws Exception {
     @Test
     void givenStack_whenUsingStreamReverse_thenPrintStack() throws Exception {
         String output = tapSystemOut(() -> PrintStack.givenStack_whenUsingStreamReverse_thenPrintStack());
-        assertEquals("30\n20\n10\n", output.replace("\r\n", "\n"));
+        assertEquals("30\n10\n20\n", output.replace("\r\n", "\n"));
     }
 
     @Test

core-java-modules/core-java-io-8/pom.xml

@@ -0,0 +1,37 @@
+<?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-io-8</artifactId>
+    <packaging>jar</packaging>
+    <name>core-java-io-8</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>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.openjdk.jmh</groupId>
+                            <artifactId>jmh-generator-annprocess</artifactId>
+                            <version>${jmh-generator.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    
+</project>

core-java-modules/core-java-io-8/src/test/java/com/baeldung/replacewordinfile/ReplaceWordInFileUnitTest.java

@@ -0,0 +1,100 @@
+package com.baeldung.replacewordinfile;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.List;
+import java.util.Scanner;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.apache.commons.io.FileUtils;
+import org.junit.jupiter.api.Test;
+
+public class ReplaceWordInFileUnitTest {
+
+    private static final String FILE_PATH = "src/test/resources/data.txt";
+    private static final String FILE_OUTPUT_PATH = "src/test/resources/data_output.txt";
+    private static final String OUTPUT_TO_VERIFY = "This is a test file."+System.lineSeparator()+"This is a test file."+System.lineSeparator()+"This is a test file.";
+
+    @Test
+    public void givenFile_whenUsingBufferedReader_thenReplacedWordCorrect() throws IOException {
+        StringBuilder fileContent = new StringBuilder();
+        try (BufferedReader br = Files.newBufferedReader(Paths.get(FILE_PATH))) {
+            String line;
+            while ((line = br.readLine()) != null){
+                fileContent.append(line).append(System.lineSeparator());
+            }
+            String replacedContent = fileContent.toString().replace("sample","test").trim();
+            try (FileWriter fw = new FileWriter(FILE_OUTPUT_PATH)) {
+                fw.write(replacedContent);
+            }
+
+            assertEquals(OUTPUT_TO_VERIFY,replacedContent);
+        }
+    }
+
+    @Test
+    public void givenFile_whenUsingScanner_thenReplacedWordCorrect() throws IOException {
+        StringBuilder fileContent = new StringBuilder();
+        try (Scanner scanner = new Scanner(new File(FILE_PATH))) {
+            while (scanner.hasNextLine()){
+                fileContent.append(scanner.nextLine()).append(System.lineSeparator());
+            }
+            String replacedContent = fileContent.toString().replace("sample","test").trim();
+            try (FileWriter fw = new FileWriter(FILE_OUTPUT_PATH)) {
+                fw.write(replacedContent);
+            }
+
+            assertEquals(OUTPUT_TO_VERIFY,replacedContent);
+        }
+    }
+
+    @Test
+    public void givenFile_whenUsingFilesAPI_thenReplacedWordCorrect() throws IOException{
+        try (Stream<String> lines = Files.lines(Paths.get(FILE_PATH))) {
+            List<String> list = lines.map(line -> line.replace("sample", "test"))
+              .collect(Collectors.toList());
+            Files.write(Paths.get(FILE_OUTPUT_PATH), list, StandardCharsets.UTF_8);
+
+            assertEquals(OUTPUT_TO_VERIFY,String.join(System.lineSeparator(), list));
+        }
+    }
+
+    @Test
+    public void givenFile_whenUsingFileUtils_thenReplacedWordCorrect() throws IOException{
+        StringBuilder fileContent = new StringBuilder();
+        List<String> lines = FileUtils.readLines(new File(FILE_PATH), "UTF-8");
+        lines.forEach(line -> fileContent.append(line).append(System.lineSeparator()));
+        String replacedContent = fileContent.toString().replace("sample","test").trim();
+        try (FileWriter fw = new FileWriter(FILE_OUTPUT_PATH)) {
+            fw.write(replacedContent);
+        }
+
+        assertEquals(OUTPUT_TO_VERIFY,replacedContent);
+    }
+
+    @Test
+    public void givenLargeFile_whenUsingFilesAPI_thenReplacedWordCorrect() throws IOException{
+        try (Stream<String> lines = Files.lines(Paths.get(FILE_PATH))) {
+            Files.writeString(Paths.get(FILE_OUTPUT_PATH), "",StandardCharsets.UTF_8, StandardOpenOption.CREATE,StandardOpenOption.TRUNCATE_EXISTING);
+            lines.forEach(line -> {
+                line = line.replace("sample", "test") + System.lineSeparator();
+                try {
+                    Files.writeString(Paths.get(FILE_OUTPUT_PATH),line,StandardCharsets.UTF_8, StandardOpenOption.APPEND);
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            });
+
+            assertEquals(OUTPUT_TO_VERIFY,Files.readString(Paths.get(FILE_OUTPUT_PATH)).trim());
+        }
+    }
+}

core-java-modules/core-java-io-8/src/test/resources/data.txt

@@ -0,0 +1,3 @@
+This is a sample file.
+This is a sample file.
+This is a sample file.

core-java-modules/core-java-io-8/src/test/resources/data_output.txt

@@ -0,0 +1,3 @@
+This is a test file.
+This is a test file.
+This is a test file.

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

@@ -0,0 +1,16 @@
+<?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-lambdas-2</artifactId>
+    <packaging>jar</packaging>
+    <name>core-java-lambdas-2</name>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+</project>