jisuanqi.java

计算器

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
import java.util.*;
class MyWing extends Frame implements ActionListener
{  
  Button a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
  Box box1,box2,box3,box4,box0;
  TextField text;
  String str;
  int num;
  double num1,num2,num3;
  MyWing (String s)
  {
   super(s);
   setLayout(new BorderLayout());
   setSize(250,250);
   setLocation(380,220);
   setBackground(Color.green);
   Panel p=new Panel();
   text=new TextField("0",26);
   text.setBackground(Color.white);
   text.setEditable(false);
   text.setFocusable(false);
   p.add(text);
   add(p,BorderLayout.NORTH);
   box0=Box.createHorizontalBox();
   box1=Box.createVerticalBox();
   box2=Box.createVerticalBox();
   box3=Box.createVerticalBox();
   box4=Box.createVerticalBox();
   a0=new Button("7");
   a0.addActionListener(this);
   a1=new Button("4");
   a1.addActionListener(this);
   a2=new Button("1");
   a2.addActionListener(this);
   a3=new Button("0");
   a3.addActionListener(this);
   a4=new Button("←");
   a4.addActionListener(this);
   a5=new Button("8");
   a5.addActionListener(this);
   a6=new Button("5");
   a6.addActionListener(this);
   a7=new Button("2");
   a7.addActionListener(this);
   a8=new Button(".");
   a8.addActionListener(this);
   a9=new Button("T");
   a9.addActionListener(this);
   b0=new Button("9");
   b0.addActionListener(this);
   b1=new Button("6");
   b1.addActionListener(this);
   b2=new Button("3");
   b2.addActionListener(this);
   b3=new Button("=");
   b3.addActionListener(this);
   b4=new Button("C");
   b4.addActionListener(this);
   b5=new Button("+");
   b5.addActionListener(this);
   b6=new Button("-");
   b6.addActionListener(this);
   b7=new Button("*");
   b7.addActionListener(this);
   b8=new Button("/");
   b8.addActionListener(this);
   b9=new Button("SHUT");
   b9.setBackground(Color.red);
   b9.addActionListener(this);
   box1.add(a0);
   box1.add(Box.createVerticalStrut(12));
   box1.add(a1);
   box1.add(Box.createVerticalStrut(12));
   box1.add(a2);
   box1.add(Box.createVerticalStrut(12));
   box1.add(a3);
   box1.add(Box.createVerticalStrut(12));
   box1.add(a4);
   box1.add(Box.createVerticalStrut(12));
   box2.add(a5);
   box2.add(Box.createVerticalStrut(12));
   box2.add(a6);
   box2.add(Box.createVerticalStrut(12));
   box2.add(a7);
   box2.add(Box.createVerticalStrut(12));
   box2.add(a8);
   box2.add(Box.createVerticalStrut(12));
   box2.add(a9);
   box2.add(Box.createVerticalStrut(12));
   box3.add(b0);
   box3.add(Box.createVerticalStrut(12));
   box3.add(b1);
   box3.add(Box.createVerticalStrut(12));
   box3.add(b2);
   box3.add(Box.createVerticalStrut(12));
   box3.add(b3);
   box3.add(Box.createVerticalStrut(12));
   box3.add(b4);
   box3.add(Box.createVerticalStrut(12));
   box4.add(b5);
   box4.add(Box.createVerticalStrut(12));
   box4.add(b6);
   box4.add(Box.createVerticalStrut(12));
   box4.add(b7);
   box4.add(Box.createVerticalStrut(12));
   box4.add(b8);
   box4.add(Box.createVerticalStrut(12));
   box4.add(b9);
   box4.add(Box.createVerticalStrut(12));
   box0.add(Box.createHorizontalStrut(12));
   box0.add(box1);
   box0.add(Box.createHorizontalStrut(12));
   box0.add(box2);
   box0.add(Box.createHorizontalStrut(12));
   box0.add(box3);
   box0.add(Box.createHorizontalStrut(12));
   box0.add(box4);
   box0.add(Box.createHorizontalStrut(12));
   add(box0,BorderLayout.CENTER);   
   validate();
   setResizable(false);
   setVisible(true);
  }
  public void actionPerformed(ActionEvent e)
  {
   if(e.getSource()==a0)
   {
    text.setText(text.getText()+7);
   }
   else if(e.getSource()==a1)
   {
    text.setText(text.getText()+4);
   }
   else if(e.getSource()==a2)
   {
    text.setText(text.getText()+1);
   }
   else if(e.getSource()==a3)
   {
    text.setText(text.getText()+0);
   }
   else if(e.getSource()==a4)
   {
    str=text.getText();
    text.setText(str.substring(0,str.length()-1));
   }
   else if(e.getSource()==a5)
   {
    text.setText(text.getText()+8);
   }
   else if(e.getSource()==a6)
   {
    text.setText(text.getText()+5);
   }
   else if(e.getSource()==a7)
   {
    text.setText(text.getText()+2);
   }
   else if(e.getSource()==a8)
   {
    text.setText(text.getText()+".");
   }
   else if(e.getSource()==a9)
   {
    text.setText(""+new Date());
   }
   else if(e.getSource()==b0)
   {
    text.setText(text.getText()+9);
   }
   else if(e.getSource()==b1)
   {
    text.setText(text.getText()+6);
   }
   else if(e.getSource()==b2)
   {
    text.setText(text.getText()+3);
   }
   else if(e.getSource()==b3)
   {
    if(num==1)
    {
      num2=Double.parseDouble(text.getText());
      num3=num1+num2;
    }
    else if(num==2)
    {
      num2=Double.parseDouble(text.getText());
      num3=num1-num2;
    }
    else if(num==3)
    {
      num2=Double.parseDouble(text.getText());
      num3=num1*num2;
    }
    else if(num==4)
    {
      num2=Double.parseDouble(text.getText());
      num3=num1/num2;
    }
    text.setText(""+num3);
   }
   else if(e.getSource()==b4)
   {
    text.setText(null);
    num=0;
    num1=0.0;
    num2=0.0;
   }
   else if(e.getSource()==b5)
   {
    num1=Double.parseDouble(text.getText());
    text.setText("");
    num=1;
   }
   else if(e.getSource()==b6)
   {
    num1=Double.parseDouble(text.getText());
    text.setText("");
    num=2;
   }
   else if(e.getSource()==b7)
   {
    num1=Double.parseDouble(text.getText());
    text.setText("");
    num=3;
   }
   else if(e.getSource()==b8)
   {
    num1=Double.parseDouble(text.getText());
    text.setText("");
    num=4;
   }
   else if(e.getSource()==b9)
   {
    System.exit(0);
   }
  }
}
class JiSuanQi
{
 public static void main (String args[])
 {
  MyWing win=new MyWing("计算器");
 }
}