public class Test {

    public static void main(String[] args){
        
        MeThread me = new MeThread();
        Thread t = new Thread(me);
        t.start();

        boolean flag = true;
        int i = 1;
        synchronized (me) {
            
            while (flag) {
                System.out.println(Thread.currentThread().getName()
 
+i);
                i++;
                if (i % 10 == 0) {
                    try {
                        me.notify();//Thread.currentThread().notifyAll();
                        i = 0;
                        me.wait();//wait()必須放在notify()後邊，先喚醒再自己暫停，不存在先暫停，再喚醒
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
 
finally {
                        System.out.println("===========");
                    }
                }
            }
        }
    }
}

class MeThread implements Runnable {
    @Override
    public synchronized void run() {
        int i = 0;
        
        boolean flag = true;
        
 
while (flag) {
            System.out.println(Thread.currentThread().getName() + i);
            i++;
            if (i % 5 == 0) {
                try {
                    this.notify();//Thread.currentThread().notifyAll();
                    i = 0;
                    this.wait();
                } catch (InterruptedException e) {
                    
                    e.printStackTrace();
                }finally {
                    System.out.println("===========");
                    
                }
            }
        }
    }
}

執行結果

main0
main1
main2
main3
main4
main5
main6
main7
main8
main9
===========
Thread-00
Thread-01
Thread-02
Thread-03
Thread-04
===========
main0
main1
main2
main3
main4
main5
main6
main7
main8
main9
===========
Thread-00
Thread-01
Thread-02
Thread-03
Thread-04
===========

線程練習--主線程執行10次，非主線程執行5次