synchronize

package threadimp;

public class MySync {
public static void main(String[] args) {
final MySync sync1 = new MySync(); 
final MySync sync2 = new MySync(); 
new Thread("thread1") {
    @Override
    public void run() {
        synchronized (sync1) {
            System.out.println(this.getName() +  " start");
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println(this.getName() +  " wake up");
        }
    }
}.start();

new Thread("thread2") {
    @Override
    public void run() {
        synchronized (sync1) {
            System.out.println(this.getName() +  " start");
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println(this.getName() +  " wake up");
        }
    }
}.start();
}
}