eugenp · maibin · Sep 2, 2024 · Aug 31, 2024
diff --git a/...a-modules/core-java-io/src/main/java/com/baeldung/fileparser/CommonsFileUtilsExample.java b/...a-modules/core-java-io/src/main/java/com/baeldung/fileparser/CommonsFileUtilsExample.java
@@ -0,0 +1,18 @@
+package com.baeldung.fileparser;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.io.FileUtils;
+
+public class CommonsFileUtilsExample {
+
+    static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+        List<String> result = FileUtils.readLines(new File(filename), "utf-8");
+
+        return new ArrayList<>(result);
+    }
+
+}
diff --git a/core-java-modules/core-java-io/src/main/java/com/baeldung/fileparser/FilesLinesExample.java b/core-java-modules/core-java-io/src/main/java/com/baeldung/fileparser/FilesLinesExample.java
@@ -0,0 +1,20 @@
+package com.baeldung.fileparser;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class FilesLinesExample {
+
+    static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+
+        try (Stream<String> lines = Files.lines(Paths.get(filename))) {
+            return lines.collect(Collectors.toCollection(ArrayList::new));
+        }
+
+    }
+
+}
diff --git a/core-java-modules/core-java-io/src/main/java/com/baeldung/fileparser/GuavaFilesExample.java b/core-java-modules/core-java-io/src/main/java/com/baeldung/fileparser/GuavaFilesExample.java
@@ -0,0 +1,19 @@
+package com.baeldung.fileparser;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.google.common.io.Files;
+
+public class GuavaFilesExample {
+
+    static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+        List<String> result = Files.readLines(new File(filename), Charset.forName("utf-8"));
+
+        return new ArrayList<>(result);
+    }
+
+}
diff --git a/...s/core-java-io/src/test/java/com/baeldung/fileparser/CommonsFileUtilsExampleUnitTest.java b/...s/core-java-io/src/test/java/com/baeldung/fileparser/CommonsFileUtilsExampleUnitTest.java
@@ -0,0 +1,20 @@
+package com.baeldung.fileparser;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+class CommonsFileUtilsExampleUnitTest {
+
+    private static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+
+    @Test
+    void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = CommonsFileUtilsExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue(lines.size() == 2, "File does not has 2 lines");
+    }
+
+}
diff --git a/...modules/core-java-io/src/test/java/com/baeldung/fileparser/FilesLinesExampleUnitTest.java b/...modules/core-java-io/src/test/java/com/baeldung/fileparser/FilesLinesExampleUnitTest.java
@@ -0,0 +1,20 @@
+package com.baeldung.fileparser;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+class FilesLinesExampleUnitTest {
+
+    private static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+
+    @Test
+    void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = FilesLinesExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue(lines.size() == 2, "File does not has 2 lines");
+    }
+
+}
diff --git a/...modules/core-java-io/src/test/java/com/baeldung/fileparser/GuavaFilesExampleUnitTest.java b/...modules/core-java-io/src/test/java/com/baeldung/fileparser/GuavaFilesExampleUnitTest.java
@@ -0,0 +1,20 @@
+package com.baeldung.fileparser;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+class GuavaFilesExampleUnitTest {
+
+    private static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+
+    @Test
+    void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = GuavaFilesExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue(lines.size() == 2, "File does not has 2 lines");
+    }
+
+}