java 菜单

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了java 菜单，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含3588字，纯文字阅读大概需要6分钟。

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简介

java 核心编程

code

/*
 * @Author: your name
 * @Date: 2020-11-08 08:29:37
 * @LastEditTime: 2020-11-08 09:15:21
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: /java/calcu/MenuFrame.java
 */
package calcu;

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

/**
 * @description:
 * @param {*}
 * @return {*}
 */
public class MenuFrame extends JFrame {
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 200;
    private Action saveAction;
    private Action saveAsAction;
    private JCheckBoxMenuItem readonlyItem;
    private JPopupMenu popup;

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new MenuFrame();
            frame.setTitle("ImageTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }

    class TestAction extends AbstractAction {
        public TestAction(String name) {
            super(name);
        }

        public void actionPerformed(ActionEvent event) {
            System.out.println(getValue(Action.NAME) + " selected.");
        }
    }

    public MenuFrame() {
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        JMenu fileMenu = new JMenu("File");
        fileMenu.add(new TestAction("New"));

        // demostrate accelerators
        JMenuItem openItem = fileMenu.add(new TestAction("Open"));
        openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));

        fileMenu.addSeparator();

        saveAction = new TestAction("Save");
        JMenuItem saveItem = fileMenu.add(saveAction);
        saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));

        saveAsAction = new TestAction("Save As");
        fileMenu.add(saveAsAction);
        fileMenu.addSeparator();

        fileMenu.add(new AbstractAction("Exit") {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });
        // demostract checkbox and radio button menus

        readonlyItem = new JCheckBoxMenuItem("Read-only");
        readonlyItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                boolean saveOk = !readonlyItem.isSelected();
                saveAction.setEnabled(saveOk);
                saveAsAction.setEnabled(saveOk);
            }
        });
        ButtonGroup group = new ButtonGroup();

        JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
        insertItem.setSelected(true);
        JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");

        group.add(insertItem);
        group.add(overtypeItem);

        // demostrate icon

        Action cutAction = new TestAction("Cut");
        cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
        Action copyAction = new TestAction("Copy");
        copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
        Action pasteAction = new TestAction("Paste");
        pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));

        JMenu editMenu = new JMenu("Edit");
        editMenu.add(cutAction);
        editMenu.add(copyAction);
        editMenu.add(pasteAction);

        // demostrate nested menus

        JMenu optionMenu = new JMenu("Options");

        optionMenu.add(readonlyItem);
        optionMenu.addSeparator();
        optionMenu.add(insertItem);
        optionMenu.add(overtypeItem);

        editMenu.addSeparator();
        editMenu.add(optionMenu);

        // demostrate mnemonics

        JMenu helpMenu = new JMenu("Help");
        helpMenu.setMnemonic('H');

        JMenuItem indexItem = new JMenuItem("Index");
        indexItem.setMnemonic('I');
        helpMenu.add(indexItem);

        // you can also add the mnemonic key to an action
        Action aboutAction = new TestAction("About");
        aboutAction.putValue(Action.MNEMONIC_KEY, new Integer('A'));
        helpMenu.add(aboutAction);

        // add all top-level menus to menu bar

        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(helpMenu);

        // demostrate pop-ups

        popup = new JPopupMenu();
        popup.add(cutAction);
        popup.add(copyAction);
        popup.add(pasteAction);

        JPanel panel = new JPanel();
        panel.setComponentPopupMenu(popup);
        add(panel);

    }
}

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