本程式為實現兩個執行緒來回呼叫，要求main執行緒呼叫100次，sub執行緒呼叫10次，以上步驟反覆50次。
主要思想是將控制執行緒同步的程式碼寫在資源類內，而不是run方法內

具體程式碼

Business.java

/**
 * Created by lance on 2017/12/18.
 */
public class Business {
    public static boolean isSub=false;//判斷是否輪到sub執行緒執行

    public synchronized void sub(int i){
        if(!isSub){
            try
 
 {
                this.wait();//等待main執行完喚醒自己
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        for(int j=0;j<10;j++){
            System.out.println("sub"+j+", loop "+i);
        }

        isSub=false;
        this.notify();//喚醒main
    }

    public
 
 synchronized void main(int i){
        if(isSub){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        for(int j=0;j<100;j++){
            System.out.println("                       Main"+j+", loop "
 
+i);
        }
        isSub=true;
        this.notify();
    }
}

ThreadMain.java

public class ThreadMain extends Thread {
    Business business;
    public ThreadMain(Business business){
        this.business=business;
    }
    @Override
    public void run(){
        for(int i=0;i<50;i++){
            business.main(i);
        }
    }
}

ThreadSub.java

public class ThreadSub extends Thread{
    Business business;
    public ThreadSub(Business business){
        this.business=business;
    }
    @Override
    public void run(){
        for(int i=0;i<50;i++){
            business.sub(i);
        }
    }
}

Client.java

public class Client {
    public static void main(String args[]){
        Business business=new Business();
        ThreadMain threadMain=new ThreadMain(business);
        ThreadSub threadSub=new ThreadSub(business);
        threadMain.start();
        threadSub.start();
    }
}