javagui设计——计算器

第 1 页 共 12 页Java GUI 设计运用 Java Swing 技术实现一个简单的“计算器” ，界面如下：第 2 页 共 12 页以上测试 6/3=2.0主要实现代码如下:package domain;import javax.swing.*;import javax.swing.event.*;import java.awt.*;import java.awt.event.*;public class calculator extends JFrame implements ActionListener JFrame frame;private JButton jia = new JButton(“+“);private JButton jian = new JButton(“-“);private JButton cheng = new JButton(“*“);private JButton chu = new JButton(“/“);private JButton qiuyi = new JButton(“%“);private JButton deng = new JButton(“=“);private JButton fu = new JButton(“+/-“);private JButton dian = new JButton(“.“);private JButton kai = new JButton(“sqrt“);private JButton diao = new JButton(“1/x“);private TextField k1 = new TextField();private objConversion convert = new objConversion();JMenuItem copy, paste, help, about;JButton backspace, ce, c, num0, num1, num2, num3, num4, num5, num6, num7,第 3 页 共 12 页num8, num9;Container cp;JTextField text;String copycontent = “;boolean clickable = true, clear = true;int all = 0;double qian;String fuhao;int first = 1;public calculator() setTitle(“计算器“);setSize(400, 300);setLocation(250, 200);text = new JTextField(25);text.setText(“0.“);text.setHorizontalAlignment(JTextField.RIGHT);/ 从右到左JPanel cp1 = new JPanel();JPanel cp2 = new JPanel();JPanel cp3 = new JPanel();cp = getContentPane();cp.add(cp1, “North“);cp.add(cp2, “Center“);cp.add(cp3, “South“);cp1.setLayout(new GridLayout(1, 6);cp2.setLayout(new GridLayout(1, 3);cp3.setLayout(new GridLayout(6, 6);ButtonGroup btg = new ButtonGroup();JTextField t3 = new JTextField(25);cp1.add(text);text.setEditable(false);text.setBackground(new Color(255, 255, 255);backspace = new JButton(“Backspace“);backspace.setForeground(new Color(255, 0, 0);backspace.addActionListener(this);ce = new JButton(“CE“);第 4 页 共 12 页ce.setForeground(new Color(255, 0, 0);ce.addActionListener(this);c = new JButton(“C“);c.setForeground(new Color(255, 0, 0);c.addActionListener(this);k1.setVisible(false);cp2.add(k1);cp2.add(backspace);cp2.add(ce);cp2.add(c);num0 = new JButton(“0“);num1 = new JButton(“1“);num2 = new JButton(“2“);num3 = new JButton(“3“);num4 = new JButton(“4“);num5 = new JButton(“5“);num6 = new JButton(“6“);num7 = new JButton(“7“);num8 = new JButton(“8“);num9 = new JButton(“9“);cp3.add(num7);num7.addActionListener(this);cp3.add(num8);num8.addActionListener(this);cp3.add(num9);num9.addActionListener(this);cp3.add(num6);num6.addActionListener(this);cp3.add(num5);num5.addActionListener(this);cp3.add(num4);num4.addActionListener(this);cp3.add(num3);num3.addActionListener(this);cp3.add(num2);num2.addActionListener(this);cp3.add(num1);num1.addActionListener(this);diao.addActionListener(this);cp3.add(num0);num0.addActionListener(this);cp3.add(chu);第 5 页 共 12 页chu.setForeground(new Color(255, 0, 0);chu.addActionListener(this);cp3.add(kai);kai.addActionListener(this);cp3.add(cheng);cheng.setForeground(new Color(255, 0, 0);cheng.addActionListener(this);cp3.add(qiuyi);qiuyi.addActionListener(this);cp3.add(jian);jian.setForeground(new Color(255, 0, 0);jian.addActionListener(this);cp3.add(diao);cp3.add(fu);fu.addActionListener(this);cp3.add(dian);dian.addActionListener(this);cp3.add(jia);jia.setForeground(new Color(255, 0, 0);jia.addActionListener(this);cp3.add(deng);deng.setForeground(new Color(255, 0, 0);deng.addActionListener(this);JMenuBar mainMenu = new JMenuBar();setJMenuBar(mainMenu);JMenu editMenu = new JMenu(“编辑“);JMenu helpMenu = new JMenu(“帮助“);mainMenu.add(editMenu);mainMenu.add(helpMenu);copy = new JMenuItem(“ 复制“);paste = new JMenuItem(“ 粘贴“);KeyStroke copyks = KeyStroke.getKeyStroke(KeyEvent.VK_C,Event.CTRL_MASK);copy.setAccelerator(copyks);/ 设置退出菜单选项加上快捷键KeyStroke pasteks = KeyStroke.getKeyStroke(KeyEvent.VK_V,Event.CTRL_MASK);paste.setAccelerator(pasteks);/ 设置退出菜单选项加上快捷键editMenu.add(copy);editMenu.add(paste);copy.addActionListener(this);paste.addActionListener(this);help = new JMenuItem(“ 帮助主题“);第 6 页 共 12 页about = new JMenuItem(“ 关于计算器“);helpMenu.add(help);helpMenu.add(about);help.addActionListener(this);about.addActionListener(this);addWindowListener(new WindowDestroyer();/ 结束窗口public void actionPerformed(ActionEvent e)/ 响应动作代码if (first = 1)text.setText(“);first = 0;/ 第一次把文本框 0.清空Object temp = e.getSource();if (temp = copy) copycontent = text.getText();if (temp = paste) text.setText(text.getText() + copycontent);if (temp = help) / 打开系统帮助文件 要查资料try String filePath = “C:/WINDOWS/Help/calc.chm“;Runtime.getRuntime().exec(“cmd.exe /c “ + filePath); catch (Exception eeee) System.out.println(“打开系统的计算器出错 “);if (temp = about) JOptionPane.showMessageDialog(frame,“ Java 计算器n n07 计算机 3 班 20072481 刘学龙“, “ 关于计算器“,JOptionPane.INFORMATION_MESSAGE);try String dec = text.getText();num2.setEnabled(true);第 7 页 共 12 页num3.setEnabled(true);num4.setEnabled(true);num5.setEnabled(true);num6.setEnabled(true);num7.setEnabled(true);num8.setEnabled(true);num9.setEnabled(true); catch (Exception ee) System.out.println(“转换出错,可能你没有输入任何字符 “);text.setText(“转换出错 “);clear = false;if (temp = backspace)