Java 11 migraiton: mutex

mutex/src/main/java/com/iluwatar/mutex/App.java

@@ -38,10 +38,10 @@ public class App {
    * main method.
    */
   public static void main(String[] args) {
-    Mutex mutex = new Mutex();
-    Jar jar = new Jar(1000, mutex);
-    Thief peter = new Thief("Peter", jar);
-    Thief john = new Thief("John", jar);
+    var mutex = new Mutex();
+    var jar = new Jar(1000, mutex);
+    var peter = new Thief("Peter", jar);
+    var john = new Thief("John", jar);
     peter.start();
     john.start();
   }

mutex/src/main/java/com/iluwatar/mutex/Jar.java

@@ -48,7 +48,7 @@ public class Jar {
    * Method for a thief to take a bean.
    */
   public boolean takeBean() {
-    boolean success = false;
+    var success = false;
     try {
       lock.acquire();
       success = beans > 0;

mutex/src/main/java/com/iluwatar/mutex/Thief.java

@@ -54,7 +54,7 @@ public class Thief extends Thread {
    */
   @Override
   public void run() {
-    int beans = 0;
+    var beans = 0;
 
     while (jar.takeBean()) {
       beans = beans + 1;

mutex/src/test/java/com/iluwatar/mutex/AppTest.java

@@ -25,15 +25,12 @@ package com.iluwatar.mutex;
 
 import org.junit.jupiter.api.Test;
 
-import java.io.IOException;
-
 /**
  * Application Test Entrypoint
  */
 public class AppTest {
   @Test
-  public void test() throws IOException {
-    String[] args = {};
-    App.main(args);
+  public void test() {
+    App.main(new String[]{});
   }
 }

mutex/src/test/java/com/iluwatar/mutex/JarTest.java

@@ -23,10 +23,11 @@
 
 package com.iluwatar.mutex;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.stream.IntStream;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
 
 /**
  * Test case for taking beans from a Jar
@@ -35,12 +36,10 @@ public class JarTest {
 
   @Test
   public void testTakeBeans() {
-    Mutex mutex = new Mutex();
-    Jar jar = new Jar(10, mutex);
-    for (int i = 0; i < 10; i++) {
-      assertTrue(jar.takeBean());
-    }
+    var mutex = new Mutex();
+    var jar = new Jar(10, mutex);
+    IntStream.range(0, 10).mapToObj(i -> jar.takeBean()).forEach(Assertions::assertTrue);
     assertFalse(jar.takeBean());
   }
 
-}
+}

mutex/src/test/java/com/iluwatar/mutex/MutexTest.java

@@ -23,12 +23,12 @@
 
 package com.iluwatar.mutex;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.fail;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * Test case for acquiring and releasing a Mutex
  */
@@ -36,7 +36,7 @@ public class MutexTest {
 
   @Test
   public void acquireReleaseTest() {
-    Mutex mutex = new Mutex();
+    var mutex = new Mutex();
     assertNull(mutex.getOwner());
     try {
       mutex.acquire();