Java线程(24)：新特征-条件变量(三)
unt, int x) {
this.name = name;
this.myCount = myCount;
this.x = x;
}
public void run() {
myCount.drawing(x, name);
}
}
/**
* 普通银行账户，不可透支
*/
class MyCount {
private String oid; //账号
private int cash; //账户余额
MyCount(String oid, int cash) {
this.oid = oid;
this.cash = cash;
}
/**
* 存款
*
* @param x 操作金额
* @param name 操作人
*/
public synchronized void saving( int x, String name) {
if (x > 0) {
cash += x; //存款
System.out.println(name + "存款" + x + "，当前余额为" + cash);
}
notifyAll(); //唤醒所有等待线程。
}
/**
* 取款
*
* @param x 操作金额
* @param name 操作人
*/
public synchronized void drawing( int x, String name) {
if (cash - x < 0) {
try {
wait();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
} else {
cash -= x; //取款
System.out.println(name + "取款" + x + "，当前余额为" + cash);
}
notifyAll(); //唤醒所有存款操作
}
}
输出结果为：
李四存款3600，当前余额为13600
王五取款2700，当前余额为10900
老张存款600，当前余额为11500
老牛取款1300，当前余额为10200
胖子取款800，当前余额为9400
张三存款2000，当前余额为11400
Process finished with exit code 0
结合先前同步代码知识，举一反三，将此例改为同步代码块来实现，代码如下：
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Java线程：改为同步代码块
*
* @author leizhimin 2009-11-5 10:57:29
*/
public class Test {
public static void main(String[] args) {
//创建并发访问的账户
MyCount myCount = new MyCount( "95599200901215522", 10000);
//创建一个线程池
ExecutorService pool = Executors.newFixedThreadPool(2);
Thread t1 = new SaveThread( "张三", myCount, 2000);
Thread t2 = new SaveThread( "李四", myCount, 3600);
Thread t3 = new DrawThread( "王五", myCount, 2700);
Thread t4 = new SaveThread( "老张", myCount, 600);
Thread t5 = new DrawThread( "老牛", myCount, 1300);
Thread t6 = new DrawThread( "胖子", myCount, 800);
//执行各个线程
pool.execute(t1);
pool.execute(t2);
pool.execute(t3);
pool.execute(t4);
pool.execute(t5);
pool.execute(t6);
//关闭线程池
pool.shutdown();
}
}
/**
* 存款线程类
*/
class SaveThread extends Thread {
private String name; //操作人
private MyCount myCount; //账户
private int x; //存款金额
SaveThread(String name, MyCount myCount, int x) {
this.name = name;
this.myCount = myCount;
this.x = x;
}
public void run() {
myCount.saving(x, name);
}
}
/**
* 取款线程类
*/
class DrawThread extends Thread {
private Strin