[Ch15] Shouldn't this be synchronized? (3e711c03) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch15/TestThreads.java

+3 −2

Changes for src/main/java/ch15/TestThreads.java: 3 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		@@ -18,11 +18,12 @@ class Accum {
		private Accum() {
		}

		// singleton
		public static Accum getAccum() {
		return a;
		}

		public void updateCounter(int add) {
		public synchronized void updateCounter(int add) {
		counter += add;
		}

		@@ -51,7 +52,7 @@ class ThreadTwo implements Runnable {
		Accum a = Accum.getAccum();

		public void run() {
		for (int x = 0; x < 99; x++) {
		for (int i = 0; i < 99; i++) {
		a.updateCounter(1);
		try {
		Thread.sleep(50);