写一个死锁程序

Posted 2020-10-22

/**

• 死锁
• 产生死锁的原因
• 多个线程由于争夺资源而产生的资源阻塞状态
• 同步的前提
• 2个以上的线程 包含2
• 多个线程使用同一个锁
• @author WangShuang

• */
  public class Demo {
  public static void main(String[] args) {
  Test t = new Test(true);
  Thread rr=new Thread(t);
  rr.start();
  Test t1 = new Test(false);
  Thread rr1=new Thread(t1);
  rr1.start();
  }
  }
  class MyLock{
  public static Object lockA = new Object();
  public static Object lockB = new Object();
  }
  class Test implements Runnable{
  private boolean flag;
  public Test( boolean flag){br/>this.flag=flag;
  }
  @Override
  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");
  }
  }
  }
  }
  }