【转】生产者消费者问题应用：两个线程交替打印A、B各10次

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// 打印机类 public class Printer { private boolean hasBufferToPrint = false ; // 打印缓冲区是否有内容可以打印 // 打印A：相当于生产者，放一张纸 public synchronized void printA() { while (hasBufferToPrint) { // 缓冲区还有内容 try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.print( "A" ); hasBufferToPrint = true ; notify(); // 唤醒打印B的线程 } // 打印B：相当于消费者，消耗缓冲区中的纸，打印纸张 public synchronized void printB() { while (!hasBufferToPrint) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.print( "B" ); hasBufferToPrint = false ; notify(); // 唤醒打印A的线程 } static class ThreadA extends Thread { private Printer printer; public ThreadA(Printer printer) { this .printer = printer; } public void run() { for ( int i = 0 ; i < 10 ; i++) { printer.printA(); } } } static class ThreadB extends Thread { private Printer printer; public ThreadB(Printer printer) { this .printer = printer; } public void run() { for ( int i = 0 ; i < 10 ; i++) { printer.printB(); } } } public static void main(String args[]) { Printer printer = new Printer(); // A、B线程共享同一个打印机 Thread a = new ThreadA(printer); Thread b = new ThreadB(printer); a.start(); b.start(); } }

转载于:https://my.oschina.net/u/2393600/blog/468205