package Chapter17;
public class DoorOpen {
static String[] keys = new String[] { "第1把钥匙", "第2把钥匙" };
static class DoorKey1 extends Thread { // 静态内部类
public void run() {
synchronized (keys[0]) { // 在同一时间只能有一个类访问
System.out.println("我拿起了" + keys[0] + ",在等着朋友用" + keys[1]
+ "开防盗门");
try {
Thread.sleep(100); // 线程休眠
} catch (Exception e) { // 捕获异常
System.out.println("线程休眠出错：" + e.getMessage());
}
synchronized (keys[1]) {
System.out.println("我又拿出来" + keys[1] + "打开了防盗门");
}
}
}
}
static class DoorKey2 extends Thread { // 静态内部类
public void run() {
synchronized (keys[0]) {
System.out.println("\n朋友拿出了" + keys[0] + ",在等待我用" + keys[1]
+ "开防盗门");
try {
Thread.sleep(100); // 线程休眠
} catch (Exception e) { // 捕获异常
System.out.println("线程休眠出错：" + e.getMessage());
}
synchronized (keys[1]) {
System.out.println("朋友又拿出了" + keys[1] + "打开了防盗门");
}
}
}
}
static class GoWrong extends Thread { // 静态守护线程类
public GoWrong() {
this.setDaemon(true); // 线程设置守护
}
public void run() {
while (true) {
try {
Thread.sleep(1000); // 线程休眠
} catch (Exception e) { // 捕获异常
System.out.println("线程休眠出错：" + e.getMessage());
}
System.out.println("守护线程：程序正在运行...");
}
}
}
public static void main(String[] args) { // java程序主入口处
DoorKey1 one = new DoorKey1(); // 实例化对象
DoorKey2 two = new DoorKey2();
GoWrong daemon = new GoWrong();
one.start(); // 启动线程
two.start();
daemon.start();
}
}
