package test;
public class Test33{
private static int state = 1;
private static int num1 = 1;
private static int num2 = 2;
public static void main(String[] args) {
final Test33 t = new Test33();
new Thread(new Runnable() {
@Override
public void run() {
while(num1<100){
//两个线程都用t对象作为锁,保证每个交替期间只有一个线程在打印
synchronized (t) {
// 如果state!=1, 说明此时尚未轮到线程1打印, 线程1将调用t的wait()方法, 直到下次被唤醒
if(state!=1){
try {
t.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
// 当state=1时, 轮到线程1打印5次数字
for(int j=0; j<1; j++){
System.out.println(num1);
num1 += 2;
}
// 线程1打印完成后, 将state赋值为2, 表示接下来将轮到线程2打印
state = 2;
// notifyAll()方法唤醒在t上wait的线程2, 同时线程1将退出同步代码块, 释放t锁
t.notifyAll();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
while(num2<100){
synchronized (t) {
if(state!=2){
try {
t.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for(int j=0; j<1; j++){
System.out.println(num2);
num2 += 2;
}
state = 1;
t.notifyAll();
}
}
}
}).start();
}
}