没出现0的结果
starkpan
2017-06-26 23:11
怎么执行都是6，是版本太新了，还是电脑太慢了~唉~
public class SynchronizedDemo {
private boolean ready = false;
private int result=0;
private int number=1;
public void write(){
ready = true;
number =2;
}
public void read(){
if(ready){
result = number*3;
}
System.out.println("result的值是"+result);
}
private class ReadWriteThread extends Thread{
private boolean flag;
public ReadWriteThread(boolean flag){
this.flag = flag;
}
public void run(){
if(flag){
write();
}else{
read();
}
}
}
public static void main(String[] args){
SynchronizedDemo synDemo = new SynchronizedDemo();
synDemo.new ReadWriteThread(true).start();
synDemo.new ReadWriteThread(false).start();
}
}
2回答
-
- Peng_0008
- 2017-06-27 19:20:39
加注释，多次编译，多次执行。
-
- MichaelDuan
- 2020-10-08 08:29:09
基本上循环100000次没有出现过0，
这样循环没有出现0的场景： public static void main(String[] args) { SynchronizedDemo synchronizedDemo = new SynchronizedDemo(); for (int i = 0; i < 100000; i++) { synchronizedDemo.new SynchronizedDemoThread(true).start(); synchronizedDemo.new SynchronizedDemoThread(false).start(); } } 这样循环可以出现1的场景: public static void main(String[] args) { for (int i = 0; i < 100000; i++) { SynchronizedDemo synchronizedDemo = new SynchronizedDemo(); synchronizedDemo.new SynchronizedDemoThread(true).start(); synchronizedDemo.new SynchronizedDemoThread(false).start(); } }
细说Java多线程之内存可见性
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