BAEL-5767: Writing an ArrayList of Strings into a Text File (#12783)

* Deep vs Shallow copy of an object in java

* update indentaions

* Create a BMI Caclualtor in Java

* Create a BMI Caclualtor in Java

* Delete unused packages

* BAEL-5708: Create a BMI Calculator in Java

* BAEL-5708: Create a BMI Calculator in Java

* BAEL-5767:Writing an ArrayList of Strings into a Text File

* BAEL-5767:Writing an ArrayList of Strings into a Text File

* Deleting files from core-java-io

* BAEL-5767: Writing an ArrayList of Strings into a Text File

* Removed files from core-java-11-2

* BAEL-5767:Writing an ArrayList of Strings into a Text File

* BAEL-5767:Writing an ArrayList of Strings into a Text File

* BAEL-5767:Writing an ArrayList of Strings into a Text File

core-java-modules/core-java-11-3/src/main/java/com/baeldung/filewriter/BufferedWriterExample.java

@@ -0,0 +1,19 @@
+package com.baeldung.filewriter;
+
+import java.io.BufferedWriter;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.List;
+
+public class BufferedWriterExample {
+
+    public static String generateFileFromStringList(List<String> stringList) throws IOException {
+        final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+        BufferedWriter br = new BufferedWriter(new FileWriter(TEXT_FILENAME));
+        for (String str : stringList) {
+            br.write(str + System.lineSeparator());
+        }
+        br.close();
+        return TEXT_FILENAME;
+    }
+}

core-java-modules/core-java-11-3/src/main/java/com/baeldung/filewriter/FileWriteStringExample.java

@@ -0,0 +1,22 @@
+package com.baeldung.filewriter;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.List;
+
+public class FileWriteStringExample {
+    public static String generateFileFromStringList(List<String> stringList) throws IOException {
+        final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+        Path filePath = Paths.get(TEXT_FILENAME);
+        Files.deleteIfExists(filePath);
+        Files.createFile(filePath);
+        for (String str : stringList) {
+            Files.writeString(filePath, str + System.lineSeparator(),
+                    StandardOpenOption.APPEND);
+        }
+        return filePath.toString();
+    }
+}

core-java-modules/core-java-11-3/src/main/java/com/baeldung/filewriter/FileWriterExample.java

@@ -0,0 +1,18 @@
+package com.baeldung.filewriter;
+
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.List;
+
+public class FileWriterExample {
+
+    public static String generateFileFromStringList(List<String> stringList) throws IOException {
+        final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+        FileWriter fileWriter = new FileWriter(TEXT_FILENAME);
+        for (String str : stringList) {
+            fileWriter.write(str + System.lineSeparator());
+        }
+        fileWriter.close();
+        return TEXT_FILENAME;
+    }
+}

core-java-modules/core-java-11-3/src/test/java/com/baeldung/filewriter/BufferedWriterUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.filewriter;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.Assert.assertTrue;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+
+public class BufferedWriterUnitTest {
+
+    private static final List<String> stringList = Arrays.asList("Hello", "World");
+
+    @Test
+    public void givenUsingBufferedWriter_whenStringList_thenGetTextFile() throws IOException {
+        String fileName = BufferedWriterExample.generateFileFromStringList(stringList);
+        long count = Files.lines(Paths.get(fileName)).count();
+        assertTrue("No. of lines in file should be equal to no. of Strings in List", ((int) count) == stringList.size());
+    }
+}

core-java-modules/core-java-11-3/src/test/java/com/baeldung/filewriter/FileWriteStringUnitTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.filewriter;
+
+import org.junit.jupiter.api.Test;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertTrue;
+
+
+public class FileWriteStringUnitTest {
+
+    private static final List<String> stringList = Arrays.asList("Hello", "World");
+
+    @Test
+    public void givenUsingFileWriteString_whenStringList_thenGetTextFile() throws IOException {
+        String fileName = FileWriteStringExample.generateFileFromStringList(stringList);
+        long count = Files.lines(Paths.get(fileName)).count();
+        assertTrue("No. of lines in file should be equal to no. of Strings in List", ((int) count) == stringList.size());
+    }
+}

core-java-modules/core-java-11-3/src/test/java/com/baeldung/filewriter/FileWriterUnitTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.filewriter;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertTrue;
+
+public class FileWriterUnitTest {
+
+    private static final List<String> stringList = Arrays.asList("Hello", "World");
+
+    @Test
+    public void givenUsingFileWriter_whenStringList_thenGetTextFile() throws IOException {
+        String fileName = FileWriterExample.generateFileFromStringList(stringList);
+        long count = Files.lines(Paths.get(fileName)).count();
+        assertTrue("No. of lines in file should be equal to no. of Strings in List", ((int) count) == stringList.size());
+    }
+}

core-java-modules/core-java-11-3/src/test/resources/sampleTextFile.txt

@@ -0,0 +1,2 @@
+Hello
+World

core-java-modules/core-java-io-apis/src/test/java/com/baeldung/FileWriterExampleUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.filewriter;
+package com.baeldung;
 
 import org.junit.After;
 import org.junit.Assert;

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

@@ -38,6 +38,12 @@
             <artifactId>fscontext</artifactId>
             <version>${fscontext.version}</version>
         </dependency>
+        <dependency>
+            <groupId>javax.activation</groupId>
+            <artifactId>activation</artifactId>
+            <version>1.1</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

core-java-modules/core-java-io/src/test/resources/sampleTextFile.txt

@@ -1,2 +1,2 @@
-Hello 
-World
+Hello
+World