如何使用 DISPOSE_ON_CLOSE 或 EXIT_ON_CLOSE 的窗口关闭操作调用 ShutdownHook 线程 [英] How to invoke ShutdownHook thread with a window close operation of DISPOSE_ON_CLOSE or EXIT_ON_CLOSE

问题描述

假设 Runtime.getRuntime().addShutdownHook(new Thread() 已经正确设置，那么如何在 Java 应用程序窗口 (JFrame) 时调用 ShutdownHook 线程>) 被关闭(在这种情况下是唯一的窗口)并且处理窗口默认关闭操作是 DISPOSE_ON_CLOSE 或 EXIT_ON_CLOSE?

Assuming that Runtime.getRuntime().addShutdownHook(new Thread() has been set up correctly, how can the ShutdownHook thread be invoked when a Java application window (JFrame) is closed (in this case the only window) and the dispose window default close operation is DISPOSE_ON_CLOSE or EXIT_ON_CLOSE?

请注意，对于使用 System.exit(0) 处理的退出命令，然后通过 ShutdownHook 线程馈送，应用程序正确终止，因为所有关联的线程在 Java 应用程序退出之前终止.所以我想通过关闭 JFrame 窗口通过 ShutdownHook 线程清理来完成同样的事情.

Note that for a quit command handled with a System.exit(0) which is then fed through the ShutdownHook thread, the application terminates correctly as all the associated threads are terminated before the Java application exits. So I want to accomplish the same thing by making the closing of the JFrame window go through the ShutdownHook thread clean up.

推荐答案

这根据您的规范工作.如果我通过单击 X 按钮关闭框架，则会调用关闭挂钩.

This works according to your spec. If I close the frame by clicking the X button, the shutdown hook is invoked.

import javax.swing.*;

class ShutDownHookDemo {

    public static void endMessage() {
        // clean up threads here..
        System.out.println("Thanks for using the app.");
    }

    public static void main(String[] args) {
        Thread t = new Thread() {
            public void run() {
                endMessage();
            }
        };
        Runtime.getRuntime().addShutdownHook(t);

        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(300,300);

        f.setVisible(true);
    }
}

这篇关于如何使用 DISPOSE_ON_CLOSE 或 EXIT_ON_CLOSE 的窗口关闭操作调用 ShutdownHook 线程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！