[Ch15] If you introduce a millisecond sleep, you ALWAYS lose an update on TestSyncTest (9249d4db) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch15/TestSyncTest.java

+11 −3

Changes for src/main/java/ch15/TestSyncTest.java: 11 added lines, 3 removed lines.
Original line number	Diff line number	Diff line
		@@ -2,14 +2,16 @@ package ch15;

		import java.util.concurrent.ExecutorService;
		import java.util.concurrent.Executors;
		import java.util.concurrent.TimeUnit;

		public class TestSyncTest {
		public static void main(String[] args) {
		public static void main(String[] args) throws InterruptedException {
		ExecutorService pool = Executors.newFixedThreadPool(2);
		Balance balance = new Balance();
		pool.execute(() -> incrementBalance50Times(balance));
		pool.execute(() -> incrementBalance50Times(balance));
		pool.shutdown();
		pool.awaitTermination(10, TimeUnit.SECONDS);
		}

		private static void incrementBalance50Times(Balance balance) {
		@@ -21,10 +23,16 @@ public class TestSyncTest {
		}

		class Balance {
		int balance;
		int balance = 0;

		public void increment() {
		balance++;
		int i = balance;
		try {
		Thread.sleep(1);
		} catch (InterruptedException e) {
		e.printStackTrace();
		}
		balance = i + 1;
		}
		}