Java 线程死锁的问题解决办法

public class DeadLock {  public static void main(String[] args) {    Object obj = new Object();    Object obj1 = new Object();    DeadLockThread1 D1 = new DeadLockThread1(obj, obj1);    DeadLockThread2 D2 = new DeadLockThread2(obj, obj1);    new Thread(D1,"线程1").start();    new Thread(D2,"线程2").start();  }}class DeadLockThread1 implements Runnable {  private Object obj;  private Object obj1;  public DeadLockThread1(Object obj, Object obj1) {    this.obj = obj;    this.obj1 = obj1;  }  @Override  public void run() {    synchronized (obj) {   //DeadLockThread1锁定obj对象      try {        Thread.sleep(1000);        synchronized (obj1) { //等待锁定obj1对象，obj对象已被DeadLockThread2锁定          obj1.getClass();        }      } catch (InterruptedException e) {        e.printStackTrace();      }    }  }}class DeadLockThread2 implements Runnable {  private Object obj;  private Object obj1;  public DeadLockThread2(Object obj, Object obj1) {    this.obj = obj;    this.obj1 = obj1;  }  @Override  public void run() {    synchronized (obj1) {   //DeadLockThread2锁定obj2对象      try {        Thread.sleep(1000);        synchronized (obj) { //等待锁定obj对象，obj对象已被DeadLockThread1锁定          obj.getClass();        }      } catch (InterruptedException e) {        e.printStackTrace();      }    }  }}