1、

寫兩個執行緒，一個執行緒列印1-52，另一個執行緒列印字母A-Z。

列印順序為12A34B56C……5152Z。

學習執行緒之間的通訊協調關係。

程式碼

執行緒類Thread01

package com.ljq.test;

public class Thread01 implements Runnable {
    private Object obj;

    public Thread01(Object obj) {
        this.obj = obj;
    }

    public void run() {
        synchronized (obj) {
            for
 
 (int i = 1; i <= 26; i++) {
                System.out.print(2 * i - 1 + "");
                System.out.print(2 * i + "");
                obj.notifyAll();
                try {
                    obj.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

執行緒類Thread02

package com.ljq.test;

public class Thread02 implements Runnable {
    private Object obj;

    public Thread02(Object obj) {
        this.obj = obj;
    }

    public void run() {
        synchronized (obj) {

            for (char c = 'A'; c <= 'Z'; c++) {
                System.out.print(c + "");
                obj.notifyAll();
                try
 
 {
                    obj.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }
        }
    }

}

測試類ThreadTest

package com.ljq.test;

public class ThreadTest {
    
    public static void main(String[] args) {
        Object obj = new Object();
        Thread01 t1 = new Thread01(obj);
        Thread02 t2 = new Thread02(obj);
        Thread thread01 = new Thread(t1);
        Thread thread02 = new Thread(t2);
        thread01.start();
        thread02.start();
    }

}