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仿windows的java计算器
import java.awt.*;import javax.swing.*;import java.awt.event.*;public class Calculator extends JFrame implements ActionListener{ private static final long serialVersionUID = 1L; private JButton[] btn; private String[] labels = {"MC","MR","MS","M+","M-", "←","CE","C","±","√", "7","8","9","/","%", "4","5","6","*","1/x", "1","2","3","-","=", "0",".","+"}; private double d1 = 0.0, d2 = 0.0; private String opt = "操作符"; private JTextArea result = new JTextArea("0",3,20); public Calculator(String title) { super(title); this.setVisible(true); this.setBounds(400, 300, 200, 350); result.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); addMenu(); btn = new JButton[28]; for(int i=0;i<btn.length;i++) { btn[i] = new JButton(labels[i]); } this.add(result, BorderLayout.NORTH); Panel p = new Panel(); p.setLayout(new GridLayout(3,1)); Panel p1 = new Panel(); p1.setLayout(new GridLayout(2,5,2,2)); for(int i=0;i<10;i++) { p1.add(btn[i]); } Panel p2 = new Panel(); p2.setLayout(new GridLayout(2,5,2,2)); for(int i=10;i<20;i++) { p2.add(btn[i]); } Panel p3 = new Panel(); GridBagLayout gridbag = new GridBagLayout(); GridBagConstraints c = new GridBagConstraints(); p3.setLayout(gridbag); c.fill = GridBagConstraints.BOTH; c.insets = new Insets(1,1,0,0); c.weightx = 1.0; addButton(p3,btn[20],gridbag,c); addButton(p3,btn[21],gridbag,c); addButton(p3,btn[22],gridbag,c); addButton(p3,btn[23],gridbag,c); c.gridwidth =GridBagConstraints.REMAINDER; c.gridheight=2; addButton(p3,btn[24],gridbag,c); //0 c.gridx = 0; c.gridwidth=2; c.gridheight=1; addButton(p3,btn[25],gridbag,c); c.gridx=2; c.gridwidth=1; c.gridheight=1; addButton(p3,btn[26],gridbag,c); //+ c.gridx=3; c.gridwidth=1; c.gridheight=1; addButton(p3,btn[27],gridbag,c); p.add(p1); p.add(p2); p.add(p3); this.add(p,BorderLayout.CENTER); this.pack(); this.setResizable(false); //for(int i=0;i<28;i++) // System.out.println("btn["+i+"]: "+btn[i].getActionCommand()); for(int i=0;i<28;i++) btn[i].addActionListener(this); //关闭窗口 this.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e) { System.exit(0); } }); } public void addMenu() { JMenuBar mb = new JMenuBar(); //查看 JMenu viewMenu = new JMenu("查看(V)"); viewMenu.setMnemonic(‘V‘); JMenuItem stardardItem = new JMenuItem("标准型"); JMenuItem scienceItem = new JMenuItem("科学型"); JMenuItem digitalItem = new JMenuItem("数字统计"); JMenuItem basicItem = new JMenuItem("基本"); //编辑 JMenu editMenu = new JMenu("编辑(E)"); editMenu.setMnemonic(‘E‘); final JMenuItem copyItem = new JMenuItem("复制(C)"); copyItem.setAccelerator(KeyStroke.getKeyStroke(‘C‘,InputEvent.CTRL_MASK)); copyItem.setMnemonic(‘C‘); copyItem.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { result.selectAll(); result.copy(); } }); final JMenuItem pasteItem = new JMenuItem("粘贴(V)"); pasteItem.setAccelerator(KeyStroke.getKeyStroke(‘V‘,InputEvent.CTRL_MASK)); pasteItem.setMnemonic(‘V‘); pasteItem.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { result.paste(); } }); final JMenuItem cutItem = new JMenuItem("剪切(X)"); cutItem.setAccelerator(KeyStroke.getKeyStroke(‘X‘,InputEvent.CTRL_MASK)); cutItem.setMnemonic(‘X‘); cutItem.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { result.selectAll(); result.cut(); } }); //帮助 JMenu helpMenu = new JMenu("帮助(H)"); helpMenu.setMnemonic(‘H‘); JMenuItem viewHelpItem = new JMenuItem("查看帮助"); JMenuItem aboutItem = new JMenuItem("关于计算器"); //添加菜单项 viewMenu.add(stardardItem); viewMenu.add(scienceItem); viewMenu.addSeparator(); viewMenu.add(digitalItem); viewMenu.addSeparator(); viewMenu.add(basicItem); editMenu.add(copyItem); editMenu.add(pasteItem); editMenu.add(cutItem); helpMenu.add(viewHelpItem); helpMenu.addSeparator(); helpMenu.add(aboutItem); //添加菜单 mb.add(viewMenu); mb.add(editMenu); mb.add(helpMenu); final JPopupMenu pm = new JPopupMenu(); pm.add(copyItem); pm.add(pasteItem); pm.add(cutItem); result.addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent e) { if(e.isPopupTrigger()) pm.show(result,e.getX(),e.getY()); } }); result.add(pm); this.setJMenuBar(mb); } public void addButton(Panel p,JButton btn,GridBagLayout g, GridBagConstraints c) { g.setConstraints(btn, c); p.add(btn); } public static void main(String[] args) { new Calculator("Java 计算器"); } @Override public void actionPerformed(ActionEvent e) { Object t = e.getSource(); try{ //0-9的数字按钮 for(int i=25;i<26;i++) if(t.equals(btn[i])) result.setText(result.getText()+(i-25));//0 for(int i=20;i<23;i++) if(t.equals(btn[i])) result.setText(result.getText()+(i-19));//1 2 3 for(int i=15;i<18;i++) if(t.equals(btn[i])) result.setText(result.getText()+(i-11));//4 5 6 for(int i=10;i<13;i++) if(t.equals(btn[i])) result.setText(result.getText()+(i-3));// 7 8 9 //加法+ if(t.equals(btn[27])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); opt = "+"; } //减法- if(t.equals(btn[23])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); opt = "-"; } //乘法* if(t.equals(btn[18])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); result.setText(""); opt = "*"; } //除法/ if(t.equals(btn[13])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); opt = "/"; } //取模 if(t.equals(btn[14])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); opt = "%"; } //四则运算、取模结果 if(t.equals(btn[24])) { d2 = Double.parseDouble(result.getText()); System.out.println(d2); //result.setText(""); if(opt.equals("+")) result.setText(""+(d1+d2)); else if(opt.equals("-")) result.setText(""+(d1-d2)); else if(opt.equals("*")) result.setText(""+(d1*d2)); else if(opt.equals("/")) { if(d2 == 0) result.setText("除数不能为0"); else result.setText(""+(d1/d2)); } else if(opt.equals("%")) result.setText(""+(d1%d2)); } //求导 if(t.equals(btn[19])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); opt = "1/x"; if(opt.equals("1/x")) result.setText(""+(1/d1)); } //开方 if(t.equals(btn[9])) { d1 = Double.parseDouble(result.getText()); System.out.println(d1); opt = "√"; if(opt.equals("√")) { if(d1 > 0) result.setText(""+Math.sqrt(d1)); else result.setText("负数没有平方根"); } } //CE or C if(t.equals(btn[6]) || t.equals(btn[7])) { result.setText(""); } //← if(t.equals(btn[5])) { String s = result.getText(); result.setText(s.substring(0,s.length()-1)); } //± if(t.equals(btn[8])) { d1 = Double.parseDouble(result.getText()); result.setText(""+(-d1)); } //. if(t.equals(btn[26])) { if(result.getText().trim().indexOf(".") != -1) //判断字符串中是否已经包含了小数点 { } else //如果没有小数点 { if(result.getText().trim().equals("0"))//如果开始为0 { result.setText(("0"+e.getActionCommand()).toString()); } else if(result.getText().trim().equals(""))//如果初时显示为空 { } else { result.setText((result.getText()+e.getActionCommand()).toString()); } } } }catch(Exception ee){} }}运行结果：
ps：由于能力有限，第一行的按钮功能没有实现，关于菜单的地方还有一点不足之处。。。。。。哪位大神给我修改下？谢谢
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