简单java死锁设计002
2024-10-21 02:56:31
/**
* 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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