java单例指令重排_java实现数组去重

/** * 验证指令重排的案例 * 顺序执行下，x和y不可能同时为0，如果出现了同时为0，则说明发生了指令重排。 */
public class InstructionRearrangement { 

static int a = 0, b = 0, x = 0, y = 0;
public static void main(String[] args) throws InterruptedException { 

while (true) { 

Thread one = new Thread(() -> { 

a = 1;
x = b;
});
Thread other = new Thread(() -> { 

b = 1;
y = a;
});
one.start();
other.start();
one.join();
other.join();
//没有指令重排，x和y不可能同时为0
if (x == 0 && y == 0) { 

System.out.println("x=" + x + ",y=" + y);
}
a = 0;
b = 0;
x = 0;
y = 0;
}
}
}