上代码，利用volatile的特性；
package com.tangzhi.example;
public class PrintTest {
public static volatile int OPEN =1;
public static final void main(String[] agrs)throws InterruptedException {
Thread thread1 =new Thread(new Runnable() {
public void run() {
int cnt = 10;
while(cnt-- > 0) {
if (OPEN == 1) {
System.out.println("==>1");
OPEN = 2;
} else {
while (OPEN != 1) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
});
Thread thread2 =new Thread(new Runnable() {
public void run() {
int cnt = 10;
while(cnt-- > 0) {
if (OPEN == 2) {
System.out.println("==>2");
OPEN = 1;
} else {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
});
thread1.start();
thread2.start();
thread1.join();
thread2.join();
}
}
结果：GOOD
==>1
==>2
==>1
==>2
==>1
==>2
==>1
==>2
==>1
==>2
用锁的，再来一个;注意wait的面试题
package com.tangzhi.example;
public class PrintSyncTest {
public static volatile IntegerOPEN =1;
public static final void main(String[] agrs)throws InterruptedException {
Thread thread1 =new Thread(new Runnable() {
public void run() {
int cnt = 10;
while(cnt-- > 0) {
synchronized (OPEN){
try {
OPEN.wait(1000);
System.out.println("==>1");
OPEN = 2;
}catch (Exception e) {
System.out.println("1 ==>" + e);
}
}
}
}
});
Thread thread2 =new Thread(new Runnable() {
public void run() {
int cnt = 10;
while(cnt-- > 0) {
synchronized (OPEN){
try {
OPEN.wait(1000);
System.out.println("==>2");
OPEN = 1;
}catch (Exception e) {
System.out.println("2 ==>" + e);
}
}
}
}
});
thread1.start();
thread2.start();
thread1.join();
thread2.join();
}
}
结果：好样的
==>2
==>1
==>2
==>2
==>1
==>2
==>1
==>2
==>1
==>2
==>1
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