简单计算器.rar计算器计算器计算器

import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; import java.util.LinkedList; import java.text.NumberFormat; public class ComputerPad extends Frame implements ActionListener { NumberButton numberButton[]; OperationButton oprationButton[]; Button 小数点按钮,正负号按钮,退格按钮, 求倒数按钮,等号按钮,清零按钮; Panel panel; JTextField resultShow; String 运算符号[]={"+","-","*","/"}; LinkedList 链表; boolean 是否按下等号=false; public ComputerPad() { super("计算器"); 链表=new LinkedList(); numberButton=new NumberButton[10]; for(int i=0;i<=9;i++) { numberButton[i]=new NumberButton(i); numberButton[i].addActionListener(this); } oprationButton=new OperationButton[4]; for(int i=0;i<4;i++) { oprationButton[i]=new OperationButton(运算符号[i]); oprationButton[i].addActionListener(this); } 小数点按钮=new Button("."); 正负号按钮 =new Button("+/-"); 等号按钮=new Button("="); 求倒数按钮=new Button("1/x"); 退格按钮=new Button("退格"); 清零按钮=new Button("C"); 清零按钮.setForeground(Color.red); 退格按钮.setForeground(Color.red); 等号按钮.setForeground(Color.red); 求倒数按钮.setForeground(Color.blue); 正负号按钮.setForeground(Color.blue); 小数点按钮.setForeground(Color.blue); 退格按钮.addActionListener(this); 清零按钮.addActionListener(this); 等号按钮.addActionListener(this); 小数点按钮.addActionListener(this); 正负号按钮.addActionListener(this); 求倒数按钮.addActionListener(this); resultShow=new JTextField(10); resultShow.setHorizontalAlignment(JTextField.RIGHT); resultShow.setForeground(Color.blue); resultShow.setFont(new Font("TimesRoman",Font.PLAIN,14)); resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED)); resultShow.setBackground(Color.white); resultShow.setEditable(false); panel=new Panel(); panel.setLayout(new GridLayout(4,5)); panel.add(numberButton[1]); panel.add(numberButton[2]); panel.add(numberButton[3]); panel.add(oprationButton[0]); panel.add(清零按钮); panel.add(numberButton[4]); panel.add(numberButton[5]); panel.add(numberButton[6]); panel.add(oprationButton[1]); panel.add(退格按钮); panel.add(numberButton[7]); panel.add(numberButton[8]); panel.add(numberButton[9]); panel.add(oprationButton[2]); panel.add(求倒数按钮); panel.add(numberButton[0]); panel.add(正负号按钮); panel.add(小数点按钮); panel.add(oprationButton[3]); panel.add(等号按钮); add(panel,BorderLayout.CENTER); add(resultShow,BorderLayout.NORTH); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); setVisible(true); setBounds(100,50,240,180); setResizable(false); validate(); } public void actionPerformed(ActionEvent e) { if(e.getSource() instanceof NumberButton) { NumberButton b=(NumberButton)e.getSource(); if(链表.size()==0) { int number=b.getNumber(); 链表.add(""+number); resultShow.setText(""+number); 是否按下等号=false; } else if(链表.size()==1&&是否按下等号==false) { int number=b.getNumber(); String num=(String)链表.getFirst(); String s=num.concat(""+number); 链表.set(0,s); resultShow.setText(s); } else if(链表.size()==1&&是否按下等号==true) { int number=b.getNumber(); 链表.removeFirst(); 链表.add(""+number); 是否按下等号=false; resultShow.setText(""+number); } else if(链表.size()==2) { int number=b.getNumber(); 链表.add(""+number); resultShow.setText(""+number); } else if(链表.size()==3) { int number=b.getNumber(); String num=(String)链表.getLast(); String s=num.concat(""+number); 链表.set(2,s); resultShow.setText(s); } } else if(e.getSource() instanceof OperationButton) { OperationButton b=(OperationButton)e.getSource(); if(链表.size()==1) { String fuhao=b.get运算符号(); 链表.add(fuhao); } else if(链表.size()==2) { String fuhao=b.get运算符号(); 链表.set(1,fuhao); } else if(链表.size()==3) { String fuhao=b.get运算符号(); String number1=(String)链表.getFirst(); String number2=(String)链表.getLast(); String 运算符号=(String)链表.get(1); try { double n1=Double.parseDouble(number1); double n2=Double.parseDouble(number2); double n=0; if(运算符号.equals("+")) { n=n1+n2; } else if(运算符号.equals("-")) { n=n1-n2; } else if(运算符号.equals("*")) { n=n1*n2; } else if(运算符号.equals("/")) { n=n1/n2; } 链表.clear(); 链表.add(""+n); 链表.add(fuhao); resultShow.setText(""+n); } catch(Exception ee) { } } } else if(e.getSource()==等号按钮) { 是否按下等号=true; if(链表.size()==1||链表.size()==2) { String num=(String)链表.getFirst(); resultShow.setText(""+num); } else if(链表.size()==3) { String number1=(String)链表.getFirst(); String number2=(String)链表.getLast(); String 运算符号=(String)链表.get(1); try { double n1=Double.parseDouble(number1); double n2=Double.parseDouble(number2); double n=0; if(运算符号.equals("+")) { n=n1+n2; } else if(运算符号.equals("-")) { n=n1-n2; } else if(运算符号.equals("*")) { n=n1*n2; } else if(运算符号.equals("/")) { n=n1/n2; } resultShow.setText(""+n); 链表.set(0,""+n); 链表.removeLast(); 链表.removeLast(); } catch(Exception ee) { } } } else if(e.getSource()==小数点按钮) { if(链表.size()==0) { 是否按下等号=false; } else if(链表.size()==1)