java第几次作业?忘了

最新推荐文章于 2025-08-14 09:11:10 发布

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本文介绍了一个使用Java Swing实现的简单应用程序，通过菜单选项可以在两个不同的面板之间进行切换。该应用包括一个计算器面板和一个设置面板，每个面板都有特定的功能组件，并通过事件监听器实现了面板间的动态切换。

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
public class Main  {
    public static void main(String[] arg) throws Exception{
        final JFrame  jframe=new JFrame("测试窗口");
        jframe.setSize(500, 500);
        jframe.setLocationRelativeTo(null);
        jframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        jframe.setVisible(true);

        JMenuBar menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("主菜单");
        menuBar.add(fileMenu);

        JMenuItem initMenuItem = new JMenuItem("界面一");
        JMenuItem aftMenuItem = new JMenuItem("界面二");
        JMenuItem exitMenuItem = new JMenuItem("exit");
        fileMenu.add(initMenuItem);
        fileMenu.add(aftMenuItem);
        fileMenu.addSeparator();
        fileMenu.add(exitMenuItem);

        CalPanel panel1 = new CalPanel();
        setPanel panel2 = new setPanel();
        jframe.add(panel2);
        panel2.setVisible(false);
        //panel2.setVisible(false);
        jframe.add(panel1);
        panel1.setVisible(false);

        initMenuItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                jframe.remove(panel1);
                jframe.add(panel2);
                panel2.setVisible(true);    
                }
        });

        aftMenuItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                jframe.remove(panel2);
                jframe.add(panel1);
                panel1.setVisible(true);

            }
        });


        jframe.setJMenuBar(menuBar);
        jframe.setVisible(true);
    }
}

import java.awt.*;  
import javax.swing.*;  
    public class CalPanel extends JPanel  
    {  
        private final JButton []buttons;  
        private static final String []names = {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};  
        JTextField displayField=new JTextField(20);   
        JPanel p = new JPanel (new GridLayout (4,4,3,3));  
        public CalPanel()  
        {  
           // super("Calculator");  
            setLayout (new BorderLayout());  
            buttons = new JButton[names.length];  
            for (int i=0;i<names.length;i++) {  
                buttons[i] = new JButton (names[i]);  
                p.add (buttons[i]);  
            }  
            this.add (displayField,BorderLayout.NORTH);  
            this.add (p,BorderLayout.CENTER);  

        }  
    }

import java.awt.*;
import javax.swing.JPanel;
import javax.swing.*;
import java.awt.event.*;
public class setPanel extends JPanel {
    private final JLabel label1;
    private final JLabel label2;
    private JTextField Field1;
    private JTextField Field2;
    private JButton Button1 = new JButton("   Ok    ");
    private JButton Button2 = new JButton("Cancle");
    private JButton Button3 = new JButton("  Help  ");
    public final JCheckBox checkbox1;
    public final JCheckBox checkbox2;
    protected BorderLayout layout;
    public setPanel()
    {
        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));    
        JPanel panel2 = new JPanel();
        panel2.setLayout(new BoxLayout(panel2, BoxLayout.Y_AXIS));
        JPanel panel3 = new JPanel();
        panel3.setLayout(new BoxLayout(panel3, BoxLayout.Y_AXIS));
        JPanel panel6 = new JPanel();
        panel6.setLayout(new BoxLayout(panel6, BoxLayout.Y_AXIS));
        JPanel panel4 = new JPanel();
        panel4.setLayout(new FlowLayout());
        JPanel panel5 = new JPanel();
        panel5.setLayout(new FlowLayout());
        layout=new BorderLayout();
        setLayout(layout);
        Box box1 = Box.createVerticalBox();
        panel.add(box1);
        box1.add(Box.createRigidArea(new Dimension(15,30)));
        box1.add(Button1);
        box1.add(box1.createVerticalStrut(20));
        box1.add(Button2);
        box1.add(box1.createVerticalStrut(20));
        box1.add(Button3);
        this.add(panel,BorderLayout.EAST);
        Box box2 = Box.createVerticalBox();
        box2.add(Box.createRigidArea(new Dimension(20,50)));
        panel2.add(box2);
        checkbox1 = new JCheckBox("snap to Grid");
        box2.add(checkbox1);
        box2.add(box2.createVerticalStrut(10));
        checkbox2 = new JCheckBox("show Grid");
        box2.add(checkbox2);
        this.add(panel2, BorderLayout.WEST);
        Box box3 = Box.createVerticalBox();

        box3.add(Box.createRigidArea(new Dimension(70,30)));
        panel3.add(box3);
        Box box4 = Box.createVerticalBox();

        label1 = new JLabel("X:");
        Field1 = new JTextField(5);
        panel4.add(label1);
        panel4.add(Field1);
        box3.add(panel4);
        label2 = new JLabel("Y:");
        Field2 = new JTextField(5);
        panel5.add(label2);
        panel5.add(Field2);
        box3.add(panel5);
        this.add(panel3, BorderLayout.CENTER);
    }
}