java - Java 中带有 try 的 finally 方法

Question

类 DaemonThread 扩展线程 {

public void run() {
    System.out.println("Entering run method");

    try {
        System.out.println("In run Method: currentThread() is"
            + Thread.currentThread());

        while (true) {
            try {
                Thread.sleep(500);
            } catch (InterruptedException x) {
                System.out.println("hi");
            }

            // System.out.println("In run method: woke up again");

            finally {
                System.out.println("Leaving run1 Method");
            }
        }
    } finally {
        System.out.println("Leaving run Method");
    }

}

public static void main(String[] args) {
    System.out.println("Entering main Method");

    DaemonThread t = new DaemonThread();
    t.setDaemon(true);
    t.start();

    try {
        Thread.sleep(900);
    } catch (InterruptedException x) {}

    System.out.println("Leaving main method");
}

}

为什么第二个 finally 方法不运行...据我所知，无论条件如何，finally 方法都必须运行..但在这种情况下，只有第一个 finally 方法，为什么第二个 finally 不运行。

Answer 1

println 语句永远不会到达，因为 while(true) 循环永远不会结束!

如果你离开那个循环，那么第二个 finally block 将被执行。