staticblock.java

Java Thread Programming (Source

public class StaticBlock extends Object {
	public static synchronized void staticA() {
		System.out.println("entering staticA()");

		try { Thread.sleep(5000); } 
		catch ( InterruptedException x ) { }

		System.out.println("leaving staticA()");
	}

	public static void staticB() {
		System.out.println("entering staticB()");

		synchronized ( StaticBlock.class ) {
			System.out.println(
					"in staticB() - inside sync block");

			try { Thread.sleep(2000); } 
			catch ( InterruptedException x ) { }
		}

		System.out.println("leaving staticB()");
	}

	public static void main(String[] args) {
		Runnable runA = new Runnable() {
				public void run() {
					StaticBlock.staticA();
				}
			};

		Thread threadA = new Thread(runA, "threadA");
		threadA.start();

		try { Thread.sleep(200); } 
		catch ( InterruptedException x ) { }

		Runnable runB = new Runnable() {
				public void run() {
					StaticBlock.staticB();
				}
			};

		Thread threadB = new Thread(runB, "threadB");
		threadB.start();
	}
}