public class Deadlock {
private String a="";
private String b="";
private int n=1;
public void write(){
synchronized (a) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
synchronized (b) {
System.out.println("第" +
n+"次被写入");
n++;
}
}
}
public void read(){
synchronized (b) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
synchronized (a) {
System.out.println("第" +
n+"次被读取");
n++;
}
}
}
public class MyDeadlock implements Runnable{
private Deadlock dl; public MyDeadlock(Deadlock dl) {
this.dl = dl;
} @Override
public void run() {
for(int i=0;i<100;i++){
dl.write();
dl.read();
}
}
public class TestDeadlock {
public static void main(String[] args) {
Deadlock deadlock=new Deadlock();
MyDeadlock md=new MyDeadlock(deadlock);
Thread t1=new Thread(md);
Thread t2=new Thread(md);
t1.start();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
t2.start();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
能sleep的地方都sleep了,就是不死锁,是不是什么地方有问题?
Object b = new Object();
synchronized(a)
{
//
synchronized(b)
{
//
} }
package com.zzx.study.thread;public class TestDeadLock implements Runnable {
public int flag = 1;
static Object o1 = new Object(), o2 = new Object();
public void run() {
System.out.println("flag=" + flag);
if(flag == 1) {
synchronized(o1) {
try {
Thread.sleep(500);
} catch (Exception e) {
e.printStackTrace();
}
synchronized(o2) {
System.out.println("1");
}
}
}
if(flag == 0) {
synchronized(o2) {
try {
Thread.sleep(500);
} catch (Exception e) {
e.printStackTrace();
}
synchronized(o1) {
System.out.println("0");
}
}
}
}
public static void main(String[] args) {
TestDeadLock td1 = new TestDeadLock();
TestDeadLock td2 = new TestDeadLock();
td1.flag = 1;
td2.flag = 0;
Thread t1 = new Thread(td1);
Thread t2 = new Thread(td2);
t1.start();
t2.start();
}
}