Java多线程实现同时输出

Java多线程实现同时输出

一道经典的面试题目：两个线程，分别打印AB，其中线程A打印A，线程B打印B，各打印10次，使之出现ABABABABA.. 的效果

package com.shangshe.path;

public class ThreadAB {

/**

* @param args

*/

public static void main(String[] args) {

final Print business = new Print();

new Thread(new Runnable() {

public void run() {

for(int i=0;i<10;i++) {

business.print_A();

}

}

}).start();

new Thread(new Runnable() {

public void run() {

for(int i=0;i<10;i++) {

business.print_B();

}

}

}).start();

}

}

class Print {

private boolean flag = true;

public synchronized void print_A () {

while(!flag) {

try {

this.wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.print("A");

flag = false;

this.notify();

}

public synchronized void print_B () {

while(flag) {

try {

this.wait();

} catch (InterruptedException e) {http://

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.print("B");

flag = true;

this.notify();

}

}

由上面的例子我们可以设计出3个线程乃至于n个线程的程序，下面给出的例子是3个线程，分别打印A，B，C 10次，使之出现ABCABC.. 的效果

public class ThreadABC {

/**

* @param args

*/

public shttp://tatic void main(String[] args) {

final Print business = new Print();

new Thread(new Runnable() {

public void run() {

for(int i=0;i<100;i++) {

business.print_A();

}

}

}).start();

new Thread(new Runnable() {

public void run() {

for(int i=0;i<100;i++) {

business.print_B();

}

}

}).start();

new Thread(new Runnable() {

public void run() {

for(int i=0;i<100;i++) {

business.print_C();

}

}

}).start();

}

}

class Print {

private boolean should_a = true;

private boolean should_b = false;

private boolean should_c = false;

public synchronized void print_A () {

while(should_b || should_c) {

try {

this.wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.print("A");

should_a = false;

should_yVuOMavb = true;

should_c = false;

thihttp://s.notifyAll();

}

public synchronized void print_B () {

while(should_a || should_c) {

try {

this.wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.print("B");

should_a = false;

should_b = false;

should_c = true;

this.notifyAll();

}

public synchronized void print_C () {

while(should_a || should_b) {

try {

this.wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.print("C");

should_a = true;

should_b = false;

should_c = false;

this.notifyAll();

}

}

再一次证明了软件工程的重要性了；在多线程程序中，应该说在程序中，我们应该把那些业务逻辑代码放到同一个类中，使之高内聚，低耦合

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