java死锁代码

package jiben;

public class DeadLock {

	volatile int ff = 0;
	aa a = null;
	
	public void setA(aa aa){
		this.a = aa;
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		final DeadLock one = new DeadLock();
		final aa two = new aa();
		one.setA(two);
		two.setD(one);
		for(int i=0;i<2;i++){
			new Thread(new Runnable() {
				
				public void run() {
					System.out.println(Thread.currentThread().getName() + "---run");
					if(one.ff==0){
						one.ff = 1;
						one.do1();
						two.do2();
					}else{
						two.do2();
						one.do1();
						one.ff = 0;
					}
				}
			}).start();;
		}
		
	}
	
	public synchronized void do1(){
		System.out.println(Thread.currentThread().getName() + "----1111start");
		a.do2();
		System.out.println(Thread.currentThread().getName() + "----1111end");
	}
	

}

class aa{
	DeadLock d =null;
	public void setD(DeadLock dd){
		this.d = dd;
	}
	public synchronized void do2(){
		System.out.println(Thread.currentThread().getName() + "----222start");
		d.do1();
		System.out.println(Thread.currentThread().getName() + "----222end");
	}
}