class Test implements Runnable{

private boolean flag;

Test(boolean flag){

this.flag = flag;

}

public void run(){

if(flag){

synchronized(MyLock.lockA){

System.out.println("if lockA");

synchronized(MyLock.lockB){

System.out.println("if lockB");

}

}

}else{

synchronized(MyLock.lockB){

System.out.println("else lockB");

synchronized(MyLock.lockA){

System.out.println("else lockA");

}

}

}

}

}

class MyLock{

public static final MyLock lockA= new MyLock();

public static final MyLock lockB = new MyLock();

}

class DemoLockTest{

public static void main(String[] arg){

Test a = new Test(true);

Test b = new Test(false);

Thread t1 = new Thread(a);

Thread t2 = new Thread(b);

t1.start();

t2.start();

}

}