java 中死锁问题的实例详解

public class DeadLock implements Runnable{  String a;  String b;  boolean flag;  public DeadLock(String a,String b,boolean flag){    this.a=a;    this.b=b;    this.flag=flag;  }  public void run(){    if(flag){//     while(true){          synchronized(a){            System.out.println("锁a");            synchronized(b){              System.out.println("锁b----");            }          }//       }    }else{//   while(true){        synchronized(b){          System.out.println("锁b");          synchronized(a){            System.out.println("锁a----");          }        }//     }    }  }  public static void main(String[] args){  String a=new String("a");  String b=new String("b");  DeadLock d1=new DeadLock(a,b,true);  DeadLock d2=new DeadLock(a,b,false);  Thread t1=new Thread(d1);  Thread t2=new Thread(d2);  t1.start();  t2.start();  System.out.println("欢声笑语中打出GG");  }}