打印ABC

有三个线程ID分别是A、B、C,请有多线编程实现，在屏幕上循环打印ABC十次

 

 

package Thread.abc;

public class ABCPrintInOrder {
	
	
	public static void main(String[] args) {
		Object obj = new Object();
		
		PrintA A = new PrintA();
		PrintC C = new PrintC(A);
		PrintB B = new PrintB(C);
		A.setPrintB(B);
		A.setPrintC(C);
		
		A.start();
	}
}

class PrintA extends Thread {
	PrintB B;
	PrintC C;
	
	public PrintA(){}
	public PrintA(PrintB B){ this.B = B; }
	
	@Override
	public synchronized void start() {
		super.start();
		synchronized (this.B){
			try {
				//System.out.println("A: B僵尸");
				this.B.wait();
			} catch (InterruptedException e) {}
		}
		//System.out.println("A: B准备开始执行");
		B.start();
	}
	
	@Override
	public void run() {
		while(true){
			print();
			try {
				Thread.sleep(300);
			} catch (InterruptedException e) {}
		}
	}
	
	public void print(){
		System.out.println("A");

		synchronized (this.B){
			//System.out.println("A: 复活B");
			this.B.notifyAll();
		}
		synchronized (this.C) {
			try {
				//System.out.println("A: 僵尸C");
				this.C.wait();
			} catch (InterruptedException e) { }
		}
		
		synchronized (this) {
			try {
				//System.out.println("A: 僵尸A");
				this.wait();
			} catch (InterruptedException e) { }
		}
	}
	
	public void setPrintB(PrintB B){ this.B = B; }
	public void setPrintC(PrintC C){ this.C = C; }
}

class PrintB extends Thread {
	
	PrintC C;
	public PrintB(PrintC C){ this.C = C; }
	
	@Override
	public synchronized void start() {
		super.start();
		synchronized (this.C){
			try {
				//System.out.println("B: C僵尸");
				this.C.wait();
			} catch (InterruptedException e) {}
		}
		//System.out.println("B: C准备开始执行");
		C.start();
	}

	@Override
	public void run() {
		while(true){
			print();
			try {
				Thread.sleep(400);
			} catch (InterruptedException e) { }
		}
	}
	
	public void print(){
		System.out.println("B");
		synchronized (this.C){
			this.C.notifyAll();
		}
		synchronized (this) {
			try {
				this.wait();
			} catch (InterruptedException e) { }
		}
	}
}

class PrintC extends Thread {
	
	PrintA A;
	
	public PrintC(PrintA A){
		this.A = A;
	}
	
	@Override
	public void run() {
		while(true){
			print();
			try {
				Thread.sleep(500);
			} catch (InterruptedException e) { }
		}
	}
	
	public void print(){
		System.out.println("C");
		synchronized (this.A){
			//System.out.println("--------------");
			this.A.notifyAll();
		}
		synchronized (this) {
			try {
				this.wait();
			} catch (InterruptedException e) { }
		}
	}
}