一个问题_Java相关

一个问题

编写程序，实现如图所示功能：在宽高文本框中输入数值，当单击“更改”按钮时，将窗体大小改为文本框中输入值，单击“退出”时，退出应用程序。

搜索更多相关的解决方案: 编写程序 应用程序 文本框 如图所示

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贴一个代码，随便写的，不过能运行：）

程序代码：

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

class LabelPanel extends JPanel { JTextField width, hight;

LabelPanel() { add(new JLabel(\"宽\")); width = new JTextField(10); add(width);

add(new JLabel(\"高\")); hight = new JTextField(10); add(hight); } }

class MyFrame extends JFrame { private LabelPanel panel = new LabelPanel(); public MyFrame() { setTitle(\"窗口大小\"); setSize(300, 200);

Container contentPane = getContentPane(); contentPane.add(panel, BorderLayout.CENTER); contentPane.add(new ButtonPanel(), BorderLayout.SOUTH); } private class ButtonPanel extends JPanel implements ActionListener { JButton modify = new JButton(\"更改\"); JButton quit = new JButton(\"退出\"); public ButtonPanel() { modify.addActionListener(this); quit.addActionListener(this);

add(modify); add(quit); }

public void actionPerformed(ActionEvent e) { Object source = e.getSource();

if(source == modify) { String width = panel.width.getText(); String hight = panel.hight.getText(); if(width.equals(\"\") || hight.equals(\"\")) JOptionPane.showMessageDialog(MyFrame.this, \"Please enter the data!\"); else { int w = Integer.parseInt(width); int h = Integer.parseInt(hight); MyFrame.this.setSize(w, h); } } else if(source == quit) { System.exit(0); } } } }

public class EventTest { public static void main(String[] args) { MyFrame test = new MyFrame(); test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); test.show(); } }

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