Multi-threading 中 如何讓執行緒可以交互執行 會涉及到三個方法：
/**
* @author sunwc
* @create 2023-03-24 下午 03:02
*/
public class PrintNumberInteraction {
public static void main(String[] args) {
Number number = new Number();
Thread t1 = new Thread(number);
Thread t2 = new Thread(number);
t1.setName("thread 1");
t2.setName("thread 2");
t1.start();
t2.start();
}
}
class Number implements Runnable {
private int number = 1;
@Override
public void run() {
while (number <= 50) {
synchronized (this) {
// 喚醒阻塞中的執行緒
this.notify();
if (number <= 50) {
System.out.println(Thread.currentThread().getName() + ": number - " + number);
number++;
}
try {
// 當前執行緒阻塞並釋放同步鎖，讓其它執行緒進入
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
輸出結果：
thread 2: number - 1
thread 1: number - 2
thread 2: number - 3
thread 1: number - 4
thread 2: number - 5
thread 1: number - 6
thread 2: number - 7
thread 1: number - 8
thread 2: number - 9
thread 1: number - 10
thread 2: number - 11
thread 1: number - 12
thread 2: number - 13
thread 1: number - 14
thread 2: number - 15
thread 1: number - 16
thread 2: number - 17
thread 1: number - 18
thread 2: number - 19
thread 1: number - 20
thread 2: number - 21
thread 1: number - 22
thread 2: number - 23
thread 1: number - 24
thread 2: number - 25
thread 1: number - 26
thread 2: number - 27
thread 1: number - 28
thread 2: number - 29
thread 1: number - 30
thread 2: number - 31
thread 1: number - 32
thread 2: number - 33
thread 1: number - 34
thread 2: number - 35
thread 1: number - 36
thread 2: number - 37
thread 1: number - 38
thread 2: number - 39
thread 1: number - 40
thread 2: number - 41
thread 1: number - 42
thread 2: number - 43
thread 1: number - 44
thread 2: number - 45
thread 1: number - 46
thread 2: number - 47
thread 1: number - 48
thread 2: number - 49
thread 1: number - 50
1.調用的要求不同：sleep()可以在任何需要的場景下使用；wait()必須使用在 synchronized修飾的區塊 或 同步方法中
2.關於是否釋放同步鎖：若兩的方法都使用在 synchronized 結構中，sleep不會釋放鎖；而wait()會釋放鎖