/*
* 同步函数的使用的锁是this
*
* 同步函数和同步代码块的区别：
* 同步函数的锁是固定的this。
*
* 同步代码块的锁是任意的对象
*
* 建议使用同步代码块
*/
class Ticket_1 implements Runnable{
private int num = 400;
Object obj = new Object();
boolean flag = true;
public void run(){
if(flag)
while(true)
{
synchronized(obj){
if(num > 0){
try{
Thread.sleep(10);
}
catch(InterruptedException e){}
System.out.println(Thread.currentThread().getName() + “……block……..” + num–);
}
}
}
else
while(true)
this.show();
}
public synchronized void show(){
if(num > 0){
try{
Thread.sleep(10);
}
catch(InterruptedException e){}
System.out.println(Thread.currentThread().getName() + “…….function….” + num–);
}
}
}
public class SynThreadDemo {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Ticket_1 t = new Ticket_1();
Thread t1 = new Thread(t);
Thread t2 = new Thread(t);
Thread t3 = new Thread(t);
Thread t4 = new Thread(t);
t1.start();
try{
Thread.sleep(10);
}catch(InterruptedException e){
System.out.println(Thread.currentThread().getName() + “………….”);
}
t.flag = false;
t2.start();
//t3.start();
//t4.start();
}
}
=================================================================================================================================
/*
* 静态的同步函数使用的锁是 该函数所属字节码文件对象
* 可以用getClass方法获取 也可以用当前 类名.class表示
*
*/
class Ticket_2 implements Runnable{
private static int num = 200;
//Object obj = new Object();
boolean flag = true;
public void run(){
if(flag)
while(true)
{
synchronized(Ticket_2.class)//(this.getClass())
{
if(num > 0){
try{
Thread.sleep(10);
}
catch(InterruptedException e){}
System.out.println(Thread.currentThread().getName() + “……block……..” + num–);
}
}
}
else
while(true)
this.show();
}
public static synchronized void show(){
if(num > 0){
try{
Thread.sleep(10);
}
catch(InterruptedException e){}
System.out.println(Thread.currentThread().getName() + “…….function….” + num–);
}
}
}
public class StaticSynFunction {
// TODO Auto-generated method stub
public static void main(String[] args) {
// TODO Auto-generated method stub
Ticket_2 t = new Ticket_2();
Thread t1 = new Thread(t);
Thread t2 = new Thread(t);
Thread t3 = new Thread(t);
Thread t4 = new Thread(t);
t1.start();
try{
Thread.sleep(10);
}catch(InterruptedException e){
System.out.println(Thread.currentThread().getName() + “………….”);
}
t.flag = false;
t2.start();
//t3.start();
//t4.start();
}
}
