第四章多线程习题

最新推荐文章于 2021-06-19 15:38:27 发布

原创最新推荐文章于 2021-06-19 15:38:27 发布 · 236 阅读

CC 4.0 BY-SA版权

本文通过两个具体案例介绍Java中线程的实现方式：继承Thread类与实现Runnable接口。此外，还提供了一个模拟银行ATM取款机的同步操作案例，演示了如何使用synchronized关键字确保线程安全。

package xiancheng;

public class TW extends Thread {

public void run() {
for (int i = 1; i <= 5; i++) {
System.out.print(i+" ");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

}

package xiancheng;

public class TestTW {
public static void main(String[] args) {
TW tw=new TW();
tw.start();
}
}

package xiancheng;

public class TWO implements Runnable{

public void run() {
for (int i = 1; i <=5 ; i++) {
System.out.println(i+" ");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

}

package xiancheng;

public class TestTWO {
public static void main(String[] args) {
Thread thread=new Thread(new TWO());
thread.start();
}

}

package xiancheng;

public class ATM implements Runnable {
private int totalMoney = 500;

public synchronized void run() {
for (int i = 0; i < 5; i++) {
takeMoney();
}
// while(true) {
// if(totalMoney<=0) {
// System.out.println("余额不足以支付"+Thread.currentThread().getName()+"的取款,余额为0");
// break;
// }
// takeMoney();
// }
}

public synchronized void takeMoney() {
if (totalMoney <= 0) {
System.out.println("余额不足以支付" + Thread.currentThread().getName() + "的取款,余额为0");
return;
}
System.out.println(Thread.currentThread().getName() + "准备取款");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
totalMoney -= 100;
System.out.println(Thread.currentThread().getName() + "完成取款");

}

}

package xiancheng;

public class TestATM {
public static void main(String[] args) {
ATM atm = new ATM();
new Thread(atm, "张三").start();
new Thread(atm, "张三的老婆").start();

}
}