死锁--java 只对方法内的语句死锁

public class TestDeadlock implements Runnable {
public int flag = 1;
static Object o1 = new Object();
static Object o2 = new Object();
public void run(){
System.out.println("flag="+flag);
if(flag == 1){
synchronized(o1){//死锁 当flag等于1时死锁o1 同时死锁o2时才能执行输出语句
try{
  Thread.sleep(500);
}catch(Exception e){}

synchronized(o2){
System.out.println("1");
}
}
}
if(flag==0){//死锁 当flag等于0时死锁o2 同时死锁o1时才能执行输出语句
synchronized(o2){
try{
Thread.sleep(500);
}catch(Exception e){}

synchronized(o1){
 System.out.println("0");
}
}
 
  }
 
}
  public static void main(String[] args){
TestDeadlock td1 = new TestDeadlock();
TestDeadlock td2 = new TestDeadlock();
td1.flag = 1;
td2.flag = 0;
Thread t1 = new Thread(td1);
Thread t2 = new Thread(td2);
t1.start();//t1进程开始 死锁o1 进入睡眠 时执行t2进程 死锁o2 则程序会死锁住
t2.start();
}
}