子线程和 主线程 互换

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package demo;   /**  * 子线程循环5次，主线程循环10次。依次交替。整个交替循环3次  *  */ public class ThreadTest {     public static void main(String[] args) {         init();     }           static void init(){         final Print p = new Print();//封装了 循环的动作         new Thread(new Runnable(){               @Override             public void run() {                 for(int i=0;i<3;i++){                         p.subPrint(5);//循环5次                     }                 }         }).start();                   new Thread(new Runnable(){                           @Override             public void run() {                 for(int i=0;i<3;i++){                     p.mainPrint(10);//循环10次                 }             }                       }).start();     }   }

　　

Print：

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package demo;   /**  * 两个方法之间互斥 （方法里面完整执行完），用 Sflag实现 开关控制 两个方法的切换  *  */ public class Print {     boolean Sflag = true;     public synchronized void subPrint(int num){         while(!Sflag){//避免 伪唤醒             try {                 this.wait();             } catch (InterruptedException e) {                 e.printStackTrace();             }         }         for(int i=1;i<=num;i++){             System.out.println(Thread.currentThread().getName()+":"+i);         }         Sflag = false;         this.notifyAll();     }     public synchronized void mainPrint(int num){         while(Sflag){             try {                 this.wait();             } catch (InterruptedException e) {                 e.printStackTrace();             }         }         for(int i=1;i<=num;i++){             System.out.println(Thread.currentThread().getName()+":"+i);         }         Sflag = true;         this.notifyAll();     }   }