Get Current Directory Using Java

sreekanthsnair · sreekanthsnair · commit c9599313c809 · 2019-07-19T11:46:05.000+05:30
diff --git a/core-java-modules/core-java-os/src/main/java/com/baeldung/core/pwd/CurrentDirectoryFetcher.java b/core-java-modules/core-java-os/src/main/java/com/baeldung/core/pwd/CurrentDirectoryFetcher.java
@@ -0,0 +1,40 @@
+package com.baeldung.core.pwd;
+
+import java.io.File;
+import java.nio.file.FileSystems;
+import java.nio.file.Paths;
+
+public final class CurrentDirectoryFetcher {
+
+    public static void main(String[] args) {
+        System.out.printf("Current Directory Using Java System API: %s%n", currentDirectoryUsingSystemProperties());
+
+        System.out.printf("Current Directory Using Java IO File API: %s%n", currentDirectoryUsingFile());
+
+        System.out.printf("Current Directory Using Java NIO FileSystems API: %s%n", currentDirectoryUsingFileSystems());
+
+        System.out.printf("Current Directory Using Java NIO Paths API: %s%n", currentDirectoryUsingPaths());
+    }
+
+    public static String currentDirectoryUsingSystemProperties() {
+        return System.getProperty("user.dir");
+    }
+
+    public static String currentDirectoryUsingPaths() {
+        return Paths.get("")
+            .toAbsolutePath()
+            .toString();
+    }
+
+    public static String currentDirectoryUsingFileSystems() {
+        return FileSystems.getDefault()
+            .getPath("")
+            .toAbsolutePath()
+            .toString();
+    }
+
+    public static String currentDirectoryUsingFile() {
+        return new File("").getAbsolutePath();
+    }
+
+}
diff --git a/core-java-modules/core-java-os/src/test/java/com/baeldung/core/pwd/CurrentDirectoryFetcherTest.java b/core-java-modules/core-java-os/src/test/java/com/baeldung/core/pwd/CurrentDirectoryFetcherTest.java
@@ -0,0 +1,34 @@
+package com.baeldung.core.pwd;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class CurrentDirectoryFetcherTest {
+
+    private static final String CURRENT_DIR = "core-java-os";
+
+    @Test
+    public void whenUsingSystemProperties_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingSystemProperties()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaNioPaths_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingPaths()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaNioFileSystems_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingFileSystems()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaIoFile_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingFile()
+            .endsWith(CURRENT_DIR));
+    }
+}
