标签：多线程 synchronized 并发 static
如果用synchronized修饰一个类成员方法A,那么就不会出现下面的情况:package thread;
public class SyncTest implements Runnable {
public synchronized void m1() throws Exception{
System.out.println("m1开始");
Thread.sleep(2000);
System.out.println("m1结束");
}
public void m2() throws Exception {
System.out.println("m2开始");
Thread.sleep(2000);
System.out.println("m2结束");
}
public void run() {
try {
m1();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws Exception {
SyncTest tt = new SyncTest();
Thread t = new Thread(tt);
t.start();
Thread.sleep(1000); //保证先运行m1
tt.m2();
}
}大家可以先猜一下运行结果/**
* @author Jack Zhang
* @version vb1.0
* @Email virgoboy2004@163.com
* @Date 2012-5-20
*/
public class Test
{
public static synchronized void staticX() throws InterruptedException
{
for (int i = 0; i < 10; i++){
Thread.sleep(1000);
System.out.println("staticX.......................");
}
}
public synchronized void x() throws InterruptedException{
for (int i = 0; i < 10; i++){
Thread.sleep(1000);
System.out.println("x.......................");
}
}
public static void main(String[] args)
{
final Test test1 = new Test();
Thread thread = new Thread(new Runnable(){
public void run(){
try{
test1.x();
}catch (InterruptedException e){
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, "a");
Thread thread1 = new Thread(new Runnable(){
public void run(){
try{
Test.staticX();
} catch (InterruptedException e){
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, "b");
thread1.start();
thread.start();
}
}/**
* @author Jack Zhang
* @version vb1.0
* @Email virgoboy2004@163.com
* @Date 2012-5-20
*/
public class Test
{
public final static Byte[] locks = new Byte[0];
public static void staticX() throws InterruptedException
{
synchronized (locks)
{
for (int i = 0; i < 10; i++)
{
Thread.sleep(1000);
System.out.println("staticX.......................");
}
}
}
public void x() throws InterruptedException
{
synchronized (locks)
{
for (int i = 0; i < 10; i++)
{
Thread.sleep(1000);
System.out.println("x.......................");
}
}
}
public static void main(String[] args)
{
final Test test1 = new Test();
final Test test2 = new Test();
Thread thread = new Thread(new Runnable()
{
public void run()
{
try
{
test1.x();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, "a");
Thread thread1 = new Thread(new Runnable()
{
public void run()
{
try
{
Test.staticX();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, "b");
thread1.start();
thread.start();
}
}结果标签：多线程 synchronized 并发 static
原文地址：http://blog.csdn.net/dlf123321/article/details/42373451
