Java项目中出现死锁如何解决

import java.util.Date;public class LockTest {  public static String obj1 = "obj1";  public static String obj2 = "obj2";  public static void main(String[] args) {   LockA la = new LockA();   new Thread(la).start();   LockB lb = new LockB();   new Thread(lb).start();  }}class LockA implements Runnable{  public void run() {   try {     System.out.println(new Date().toString() + " LockA 开始执行");     while(true){      synchronized (LockTest.obj1) {        System.out.println(new Date().toString() + " LockA 锁住 obj1");        Thread.sleep(3000); // 此处等待是给B能锁住机会        synchronized (LockTest.obj2) {         System.out.println(new Date().toString() + " LockA 锁住 obj2");         Thread.sleep(60 * 1000); // 为测试，占用了就不放        }      }     }   } catch (Exception e) {     e.printStackTrace();   }  }}class LockB implements Runnable{  public void run() {   try {     System.out.println(new Date().toString() + " LockB 开始执行");     while(true){      synchronized (LockTest.obj2) {        System.out.println(new Date().toString() + " LockB 锁住 obj2");        Thread.sleep(3000); // 此处等待是给A能锁住机会        synchronized (LockTest.obj1) {         System.out.println(new Date().toString() + " LockB 锁住 obj1");         Thread.sleep(60 * 1000); // 为测试，占用了就不放        }      }     }   } catch (Exception e) {     e.printStackTrace();   }  }}