最大化JFrame的行动？

编程入门行业动态更新时间:2024-10-25 03:33:29

本文介绍了最大化JFrame的行动？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

有没有人知道在发生特定操作后如何最大化JFrame？我将在下面发布我的代码，我是一个不评论我的代码的恶魔（我会在某些时候这样做）但它应该是相当自我解释的。我试图做的是从菜单中选择选项后使框架最大化。如果有人能告诉我如何编辑我的代码来解决这个问题，我们将不胜感激。

Does anyone know how to maximize a JFrame once a specfic action has occured? I'll post my code below, I'm a fiend for not commenting my code (I'll do it at some point) but it should be fairly self explanitory. What I was trying to do was to get the frame to maximize once the option was selected from the menu. If anyone can tell me how I need to edit my code to pull this off, it would be greatly appreciated.

谢谢！

import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.JMenu; import javax.swing.JMenuItem; import javax.swing.ButtonGroup; import javax.swing.JMenuBar; import javax.swing.KeyStroke; import javax.swing.ImageIcon; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JScrollPane; import javax.swing.JFrame; public class MainMenu implements ActionListener { JTextArea output; JScrollPane scrollPane; String newline = "\n"; MapMenu maps = new MapMenu(); public JMenuBar createMenuBar() { JMenuBar menuBar; JMenu menu; JMenuItem menuItem; JMenuItem minOption, maxOption; //Create the menu bar. menuBar = new JMenuBar(); //Build the first menu. menu = new JMenu("File"); menu.setMnemonic(KeyEvent.VK_A); menu.getAccessibleContext().setAccessibleDescription("For window operations"); menuBar.add(menu); minOption = new JMenuItem("Minimize", KeyEvent.VK_T); minOption.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_1, ActionEvent.ALT_MASK)); minOption.getAccessibleContext().setAccessibleDescription("Will minimize window"); minOption.setActionCommand("Minimize"); minOption.addActionListener(this); menu.add(minOption); maxOption = new JMenuItem("Maximize", KeyEvent.VK_T); maxOption.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_2, ActionEvent.ALT_MASK)); maxOption.getAccessibleContext().setAccessibleDescription("Will maximize window"); maxOption.setActionCommand("Maximize"); maxOption.addActionListener(this); menu.add(maxOption); menuItem = new JMenuItem("Exit", KeyEvent.VK_T); menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_3, ActionEvent.ALT_MASK)); menuItem.getAccessibleContext().setAccessibleDescription("Will close window"); menuItem.addActionListener(this); menu.add(menuItem); //Build second menu in the menu bar. menu = new JMenu("Pages"); menu.setMnemonic(KeyEvent.VK_N); menu.getAccessibleContext().setAccessibleDescription("For accessing other pages"); menuBar.add(menu); menuItem = new JMenuItem("Date Calculator", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens date calculator"); menuItem.addActionListener(this); menu.add(menuItem); menuItem = new JMenuItem("Maps", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens popular maps"); menuItem.addActionListener(this); menu.add(menuItem); menuItem = new JMenuItem("Points System", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens points chart"); menuItem.addActionListener(this); menu.add(menuItem); menuItem = new JMenuItem("Foreign Language Re-targets", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens LPS Lists"); menuItem.addActionListener(this); menu.add(menuItem); //Build third menu in the menu bar. menu = new JMenu("Resources"); menu.setMnemonic(KeyEvent.VK_N); menu.getAccessibleContext().setAccessibleDescription("For external resources"); menuBar.add(menu); menuItem = new JMenuItem("Helpful Sites", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens website links"); menuItem.addActionListener(this); menu.add(menuItem); //Build fourth menu in the menu bar. menu = new JMenu("Help"); menu.setMnemonic(KeyEvent.VK_N); menu.getAccessibleContext().setAccessibleDescription("For help pages"); menuBar.add(menu); menuItem = new JMenuItem("How To Use", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens tutorial for AAA"); menuItem.addActionListener(this); menu.add(menuItem); menuItem = new JMenuItem("About", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens information about AAA"); menuItem.addActionListener(this); menu.add(menuItem); menuItem = new JMenuItem("Update", KeyEvent.VK_T); menuItem.getAccessibleContext().setAccessibleDescription("Opens website for AAA"); menuItem.addActionListener(this); menu.add(menuItem); return menuBar; } public Container createContentPane() { //Create the content-pane-to-be. JPanel contentPane = new JPanel(new BorderLayout()); contentPane.setOpaque(true); //Create a scrolled text area. output = new JTextArea(5, 30); output.setEditable(false); scrollPane = new JScrollPane(output); //Add the text area to the content pane. contentPane.add(scrollPane, BorderLayout.CENTER); return contentPane; } // Returns just the class name -- no package info. protected String getClassName(Object o) { String classString = o.getClass().getName(); int dotIndex = classString.lastIndexOf("."); return classString.substring(dotIndex+1); } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path) { java.URL imgURL = MainMenu.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame.setDefaultLookAndFeelDecorated(false); JFrame frame = new JFrame("Account Appeal Aide"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. MainMenu demo = new MainMenu(); frame.setJMenuBar(demo.createMenuBar()); frame.setContentPane(demo.createContentPane()); //Display the window. frame.setSize(500, 400); frame.setVisible(true); frame.setResizable(false); Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); int w = frame.getSize().width; int h = frame.getSize().height; int x = (dim.width-w)/2; int y = (dim.height-h)/2; frame.setLocation(x, y); } public void maximizeFrame(JFrame aFrame) { aFrame.setExtendedState(aFrame.getExtendedState()|JFrame.MAXIMIZED_BOTH); } public void actionPerformed(ActionEvent e) { if("Minimize".equals(e.getActionCommand())) { maps.openMapMenu(); } if("Maximize".equals(e.getActionCommand())) { //maximizeFrame(); } } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }

}

推荐答案

您不需要包含当前状态;这应该足够了：

You don't need to include the current state; this should be enough:

aFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);

您需要在 actionPerformed 方法，所以你应该把它变成一个私有字段。

You will need access to your frame in the actionPerformed method, though, so you should probably make it a private field.

在你的课程开始时，你声明一些字段。这些都应该标记为私有，你也应该添加框架。所以它看起来像这样：

At the beginning of your class, you declare some fields. Those should all be marked private, and you should add the frame as well. So it would look like this:

public class MainMenu implements ActionListener { private JTextArea output; private JScrollPane scrollPane; private String newline = "\n"; private MapMenu maps = new MapMenu(); private JFrame frame;

然后，当你有 JFrame frame = new JFrame（Account上诉助手）; ，只需执行 frame = new JFrame（帐户上诉助理）; 代替; frame 已经宣布。然后，您也可以在 actionPerformed 中使用它：

Then, later, when you have JFrame frame = new JFrame("Account Appeal Aide");, just do frame = new JFrame("Account Appeal Aide"); instead; frame has already been declared. Then, you can use it in actionPerformed as well: