简单java死锁设计002

/**
 * 死锁举例
 * @author lenovo
 *
 */
public class DeadlockTest {

    private static Object obj1 = new Object(); 
    private static Object obj2 = new Object(); 
    public static void main(String[] args) {
        new DeadlockTest().deadLock();
    }
    
    private void deadLock(){
        
        new Thread(new Runnable(){
            @Override
            public void run() {
                synchronized(obj1){
                    try {
                        Thread.sleep(5000);
                        System.out.println("obj1 locking");
                    } catch (InterruptedException e) {}
                    
                    synchronized(obj2){
                        System.out.println("bbb");
                    }
                }
            }
        }).start();
        
        new Thread(new Runnable(){
            @Override
            public void run() {
                synchronized(obj2){
                    try {
                        Thread.sleep(5000);
                        System.out.println("obj2 locking");
                    } catch (InterruptedException e) {}
                    
                    synchronized(obj1){
                        System.out.println("aaa");
                    }
                }
            }
        }).start();
    }
}
//来源：网上抄的

 死锁例子2

package com.loong.main;
public class ThreadDeadlock {
 
    public static void main(String[] args) throws InterruptedException {
        Object obj1 = new Object();
        Object obj2 = new Object();
        Object obj3 = new Object();
 
        Thread t1 = new Thread(new SyncThread(obj1, obj2), "t1");
        Thread t2 = new Thread(new SyncThread(obj2, obj3), "t2");
        Thread t3 = new Thread(new SyncThread(obj3, obj1), "t3");
 
        t1.start();
        Thread.sleep(5000);
        t2.start();
        Thread.sleep(5000);
        t3.start();
 
    }
 
}
 
class SyncThread implements Runnable{
    private Object obj1;
    private Object obj2;
 
    public SyncThread(Object o1, Object o2){
        this.obj1=o1;
        this.obj2=o2;
    }
    @Override
    public void run() {
        String name = Thread.currentThread().getName();
        System.out.println(name + " acquiring lock on "+obj1);
        synchronized (obj1) {
         System.out.println(name + " acquired lock on "+obj1);
         work();
         System.out.println(name + " acquiring lock on "+obj2);
         synchronized (obj2) {
            System.out.println(name + " acquired lock on "+obj2);
            work();
        }
         System.out.println(name + " released lock on "+obj2);
        }
        System.out.println(name + " released lock on "+obj1);
        System.out.println(name + " finished execution.");
    }
    private void work() {
        try {
            Thread.sleep(30000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

t1 acquiring lock on java.lang.Object@3904dd9e
t1 acquired lock on java.lang.Object@3904dd9e
t2 acquiring lock on java.lang.Object@28147a15
t2 acquired lock on java.lang.Object@28147a15
t3 acquiring lock on java.lang.Object@7605d74a
t3 acquired lock on java.lang.Object@7605d74a
t1 acquiring lock on java.lang.Object@28147a15
t2 acquiring lock on java.lang.Object@7605d74a
t3 acquiring lock on java.lang.Object@3904dd9e

// 参考：http://www.importnew.com/9668.html

死锁举例3

package com.loong.main;

public class ThreadDeadLock2 {

    private static Object obj1 = new Object();
    private static Object obj2 = new Object();
    public static void main(String[] args) {
        DeadLock2 dl1 =new DeadLock2(obj1,obj2);
        DeadLock2 dl2 =new DeadLock2(obj1,obj2);
        dl1.flag = 0;
        dl2.flag = 1;
        new Thread(dl1).start();
        new Thread(dl2).start();
    }
}

class DeadLock2 implements Runnable{
     public int flag =0;
     private Object ob1;
    private Object ob2;
    
    public DeadLock2(Object o1,Object o2){
        this.ob1 = o1;
        this.ob2 = o2;
    }
    
    @Override
    public void run() {
        if(flag==0){
            synchronized(ob1){
                System.out.println("ob1" + "starting");
                try {
                    Thread.sleep(5000);
                    System.out.println("ob1" + "ending");
                } catch (InterruptedException e) {}
                
                synchronized(ob2){
                    System.out.println("ob2");
                }
            }
        }
        if(flag==1){
            synchronized(ob2){
                System.out.println("ob2" + "starting");
                try {
                    Thread.sleep(5000);
                    System.out.println("ob2" + "ending");
                } catch (InterruptedException e) {}
                
                synchronized(ob1){
                    System.out.println("ob1");
                }
            }
        }
    }
}
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