设置三个线程顺序打印数字问题(转载)

第一种方法：通过共享对象锁的方式实现
记住调用wait方法时候需要在同步代码块内，否则会报java.lang.IllegalMonitorStateException异常！

package com.test;class Prints {public int num = 0;synchronized public void methodA() throws InterruptedException{while(num!=0){wait();}System.out.println(Thread.currentThread().getName()+":"+num);num = 1;notifyAll();}synchronized public void methodB() throws InterruptedException{while(num!=1){wait();}System.out.println(Thread.currentThread().getName()+":"+num);num = 2;notifyAll();}synchronized public void methodC() throws InterruptedException{while(num!=2){wait();}System.out.println(Thread.currentThread().getName()+":"+num);notifyAll();}
}
class ThreadClassA implements Runnable{private Prints p;public ThreadClassA(Prints p) {this.p = p;}@Overridepublic void run() {try {p.methodA();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
class ThreadClassB implements Runnable{private Prints p;public ThreadClassB(Prints p) {this.p = p;}@Overridepublic void run() {try {p.methodB();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
class ThreadClassC implements Runnable{private Prints p;public ThreadClassC(Prints p) {this.p = p;}@Overridepublic void run() {try {p.methodC();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
public class MainDemo{public static void main(String[] args) throws CloneNotSupportedException {Prints p = new Prints();ThreadClassA a = new ThreadClassA(p);ThreadClassB b = new ThreadClassB(p);ThreadClassC c = new ThreadClassC(p);Thread t1 = new Thread(a);Thread t2 = new Thread(b);Thread t3 = new Thread(c);t1.start();t2.start();t3.start();}
}

第二种方法：通过主线程Join()，join的理解：https://www.cnblogs.com/lcplcpjava/p/6896904.html

package com.test;class Prints {public int num = 0;synchronized public void methodA() throws InterruptedException{while(num!=0){wait();}System.out.println(Thread.currentThread().getName()+":"+num);num = 1;notifyAll();}synchronized public void methodB() throws InterruptedException{while(num!=1){wait();}System.out.println(Thread.currentThread().getName()+":"+num);num = 2;notifyAll();}synchronized public void methodC() throws InterruptedException{while(num!=2){wait();}System.out.println(Thread.currentThread().getName()+":"+num);notifyAll();}
}
class ThreadClassA implements Runnable{private Prints p;public ThreadClassA(Prints p) {this.p = p;}@Overridepublic void run() {
//      synchronized (Thread.currentThread()) {System.out.println("1");
//      }
/*      try {p.methodA();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}*/}}
class ThreadClassB implements Runnable{private Prints p;public ThreadClassB(Prints p) {this.p = p;}@Overridepublic void run() {System.out.println("2");
/*      try {p.methodB();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}*/}}
class ThreadClassC implements Runnable{private Prints p;public ThreadClassC(Prints p) {this.p = p;}@Overridepublic void run() {System.out.println("3");
/*      try {p.methodC();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}*/}}
public class MainDemo{public static void main(String[] args) throws CloneNotSupportedException, InterruptedException {Prints p = new Prints();ThreadClassA a = new ThreadClassA(p);ThreadClassB b = new ThreadClassB(p);ThreadClassC c = new ThreadClassC(p);Thread t1 = new Thread(a);Thread t2 = new Thread(b);Thread t3 = new Thread(c);t1.start();t1.join();t2.start();t2.join();t3.start();t3.join();}
}

第三种：通过线程执行时调用join方法

package com.test;import java.util.Random;class T1 extends Thread {public void run(){Random random = new Random();try {Thread.sleep(random.nextInt(1000));} catch (InterruptedException e) {e.printStackTrace();}System.out.println("in T1");}
}class T2 extends Thread{private Thread thread;public T2(Thread thread) {this.thread = thread;}public void run(){try {thread.join();} catch (InterruptedException e) {e.printStackTrace();}System.out.println("in T2");}
}class T3 extends Thread{private Thread thread;public T3(Thread thread) {this.thread = thread;}public void run(){try {thread.join();} catch (InterruptedException e) {e.printStackTrace();}System.out.println("in T3");}
}
public class MainDemo{public static void main(String[] args) throws CloneNotSupportedException, InterruptedException {T1 t1 = new T1();T2 t2 = new T2(t1);T3 t3 = new T3(t2);t2.start();t1.start();t3.start();}
}

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设置三个线程顺序打印数字问题(转载)

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