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计算器JAVA源代码

2007-06-28 10:16:48
版权声明：原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://su3390.blog.51cto.com/176528/32179
计算器JAVA源代码
这是我在培训班时，学了一个月后编写的一个简易计算器的源代码。从设计、编码、实现该程序共用时一天（10个小时）。当时只是学完了JAVA的基础知识，各位也看得出，这里面没有用到高深的技术，全是基础的，所以我当时理解的就是：编程主要需要的是解决问题的思维、思想！现将其公布，希望能给初学者一点起示：
[注：将考贝后，在JDK环境下可直接运行]
[源代码]
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
 class Jsqzj implements ActionListener
{   
    JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
    JFrame f;
    GridLayout c=new GridLayout(4,4);
    JTextField tf = new JTextField();
    public void init()
    {
      f=new JFrame("CardLayout testing");
     Container ct = f.getContentPane();
     tf.setHorizontalAlignment(JTextField.RIGHT);
     ct.add(tf,"North");
     JPanel p2=new JPanel(); 
     ct.add(p2,"Center");
     GridLayout c=new GridLayout(4,4);           
      p2.setLayout(c);                     
     
      JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
        b1=new JButton("1");
        b2=new JButton("2");
        b3=new JButton("3");
        b4=new JButton("4");
        b5=new JButton("5");
        b6=new JButton("6");
        b7=new JButton("7");
        b8=new JButton("8");
        b9=new JButton("9");
        b10=new JButton("0");       
        b11=new JButton(".");
        b12=new JButton("=");
        b13=new JButton("+");
        b14=new JButton("-");
        b15=new JButton("x");
        b16=new JButton("/");              
      
        p2.add(b1);
        b1.addActionListener(this);
        p2.add(b2);
        b2.addActionListener(this);
        p2.add(b3);
        b3.addActionListener(this);
        p2.add(b13);
        b13.addActionListener(this);
        p2.add(b4);
        b4.addActionListener(this);
        p2.add(b5);
        b5.addActionListener(this);
        p2.add(b6);
        b6.addActionListener(this);
        p2.add(b14);
        b14.addActionListener(this);
        p2.add(b7);
        b7.addActionListener(this);
        p2.add(b8);
        b8.addActionListener(this);
        p2.add(b9);
        b9.addActionListener(this);
        p2.add(b15);
        b15.addActionListener(this);
        p2.add(b10);
        b10.addActionListener(this);
        p2.add(b11);
        b11.addActionListener(this);
        p2.add(b12);
        b12.addActionListener(this);      
        p2.add(b16);
        b16.addActionListener(this);       
       
        f.addWindowListener(new WindowAdapter()
                          {
                           public void windowClosing(WindowEvent e)
                           {
                            System.exit(0);
                           }
                          });
        f.setSize(200,180);
        f.setVisible(true);
    }
    double sum=0;
    Vector v=new Vector(1,1);
    Vector v2=new Vector(1,1);
    public Jsqzj()
    {
     v2.addElement(new String("init"));
      v.addElement(new String("init"));
    }
    public void actionPerformed(ActionEvent e)
   {    
    String str=tf.getText();        
     if(e.getActionCommand()=="+")      //加号的实现；
     {      
       if(
            ("+").equals((String)v2.lastElement()) ||
             ("-").equals((String)v2.lastElement()) ||
             ("x").equals((String)v2.lastElement()) ||
             ("/").equals((String)v2.lastElement()) ||
             ("=").equals((String)v2.lastElement())
          )
        {
         tf.setText(String.valueOf(sum));
        }
        else if(("init").equals((String)v2.lastElement()))
             {
               tf.setText(String.valueOf(sum));
               v2.addElement(new String("="));
             }
          else
           {
              double d=Double.parseDouble(str);
             if (("+").equals((String)v.lastElement()))
             {                    
              sum=sum+d;
               tf.setText(String.valueOf(sum));
              }
              else if (("-").equals((String)v.lastElement()))
                   {
                      sum=sum-d;
                     tf.setText(String.valueOf(sum));
                   }
                   else if(("x").equals((String)v.lastElement()))
                        {
                          sum=sum*d;
                          tf.setText(String.valueOf(sum));
                        }
                        else if(("/").equals((String)v.lastElement()))
                             {
                                  sum=sum/d;
                                 tf.setText(String.valueOf(sum));
                             }
                             else if(("=").equals((String)v.lastElement()))
                                  {  
                                    sum=sum+d;                              
                                    tf.setText(String.valueOf(sum));
                                  }
                                  else
                                  {
                                    sum=sum+d;
                                    tf.setText(String.valueOf(sum));
                                  }          
              }
        v.addElement(new String("+"));
        v2.addElement(new String("+"));              
     }
    
     if(e.getActionCommand()=="-")                      //减号的实现；
     {      
       if(
            ("+").equals((String)v2.lastElement()) ||
             ("-").equals((String)v2.lastElement()) ||
             ("x").equals((String)v2.lastElement()) ||
             ("/").equals((String)v2.lastElement()) ||
             ("=").equals((String)v2.lastElement())
          )
        {
         tf.setText(String.valueOf(sum));
        }
        else if(("init").equals((String)v2.lastElement()))
             {
               tf.setText(String.valueOf(sum));
               v2.addElement(new String("="));
             }
          else
           {
              double d=Double.parseDouble(str);
             if (("+").equals((String)v.lastElement()))
             {                    
              sum=sum+d;
               tf.setText(String.valueOf(sum));
              }
              else if (("-").equals((String)v.lastElement()))
                   {
                      sum=sum-d;
                     tf.setText(String.valueOf(sum));
                   }
                   else if(("x").equals((String)v.lastElement()))
                        {
                          sum=sum*d;
                          tf.setText(String.valueOf(sum));
                        }
                        else if(("/").equals((String)v.lastElement()))
                             {
                                  sum=sum/d;
                                 tf.setText(String.valueOf(sum));
                             }
                             else if(("=").equals((String)v.lastElement()))
                                  {  
                                    sum=sum+d;                              
                                    tf.setText(String.valueOf(sum));
                                  }
                                  else
                                  {
                                    sum=sum+d;
                                    tf.setText(String.valueOf(sum));
                                  }          
              }
        v.addElement(new String("-"));
        v2.addElement(new String("-"));              
     }
    
     if(e.getActionCommand()=="x")      //乘号的实现；
     {      
       if(
            ("+").equals((String)v2.lastElement()) ||
             ("-").equals((String)v2.lastElement()) ||
             ("x").equals((String)v2.lastElement()) ||
             ("/").equals((String)v2.lastElement()) ||
             ("=").equals((String)v2.lastElement())
          )
        {
         tf.setText(String.valueOf(sum));
        }
        else if(("init").equals((String)v2.lastElement()))
             {
               tf.setText(String.valueOf(sum));
               v2.addElement(new String("="));
             }
          else
           {
              double d=Double.parseDouble(str);
             if (("+").equals((String)v.lastElement()))
             {                    
              sum=sum+d;
               tf.setText(String.valueOf(sum));
              }
              else if (("-").equals((String)v.lastElement()))
                   {
                      sum=sum-d;
                     tf.setText(String.valueOf(sum));
                   }
                   else if(("x").equals((String)v.lastElement()))
                        {
                          sum=sum*d;
                          tf.setText(String.valueOf(sum));
                        }
                        else if(("/").equals((String)v.lastElement()))
                             {
                                  sum=sum/d;
                                 tf.setText(String.valueOf(sum));
                             }
                             else if(("=").equals((String)v.lastElement()))
                                  {  
                                    sum=sum+d;                              
                                    tf.setText(String.valueOf(sum));
                                  }
                                  else
                                  {
                                    sum=sum+d;
                                    tf.setText(String.valueOf(sum));
                                  }          
              }
        v.addElement(new String("x"));
        v2.addElement(new String("x"));              
     }
    
     if(e.getActionCommand()=="/")      //除号的实现；
     {      
       if(
            ("+").equals((String)v2.lastElement()) ||
             ("-").equals((String)v2.lastElement()) ||
             ("x").equals((String)v2.lastElement()) ||
             ("/").equals((String)v2.lastElement()) ||
             ("=").equals((String)v2.lastElement())
          )
        {
         tf.setText(String.valueOf(sum));
        }
        else if(("init").equals((String)v2.lastElement()))
             {
               tf.setText(String.valueOf(sum));
               v2.addElement(new String("="));
             }
          else
           {
              double d=Double.parseDouble(str);
             if (("+").equals((String)v.lastElement()))
             {                    
              sum=sum+d;
               tf.setText(String.valueOf(sum));
              }
              else if (("-").equals((String)v.lastElement()))
                   {
                      sum=sum-d;
                     tf.setText(String.valueOf(sum));
                   }
                   else if(("x").equals((String)v.lastElement()))
                        {
                          sum=sum*d;
                          tf.setText(String.valueOf(sum));
                        }
                        else if(("/").equals((String)v.lastElement()))
                             {
                                  sum=sum/d;
                                 tf.setText(String.valueOf(sum));
                             }
                             else if(("=").equals((String)v.lastElement()))
                                  {  
                                    sum=sum+d;                              
                                    tf.setText(String.valueOf(sum));
                                  }
                                  else
                                  {
                                    sum=sum+d;
                                    tf.setText(String.valueOf(sum));
                                  }          
              }
        v.addElement(new String("/"));
        v2.addElement(new String("/"));              
     }
   
     if (e.getActionCommand()=="=" )    //等号实现；   
     {  
        if(
            ("+").equals((String)v2.lastElement()) ||
             ("-").equals((String)v2.lastElement()) ||
             ("x").equals((String)v2.lastElement()) ||
             ("/").equals((String)v2.lastElement()) ||
             ("=").equals((String)v2.lastElement())
          )
        {
         tf.setText(String.valueOf(sum));
        }
        else if(("init").equals((String)v2.lastElement()))
             {tf.setText(String.valueOf(sum));}
          else
           {
              double d=Double.parseDouble(str);
             if (("+").equals((String)v.lastElement()))
             {                   
              sum=sum+d;
               tf.setText(String.valueOf(sum));
              }
              else if (("-").equals((String)v.lastElement()))
                   {
                      sum=sum-d;
                     tf.setText(String.valueOf(sum));
                   }
                   else if(("x").equals((String)v.lastElement()))
                        {
                          sum=sum*d;
                          tf.setText(String.valueOf(sum));
                        }
                        else if(("/").equals((String)v.lastElement()))
                             {
                                  sum=sum/d;
                                 tf.setText(String.valueOf(sum));
                             }
                             else if(("=").equals((String)v.lastElement()))
                                  {  
                                     sum=sum+d;
                                    tf.setText(String.valueOf(sum));                             
                                    //tf.setText(String.valueOf(sum));
                                  }
                                  else
                                  {
                                    sum=sum+d;
                                    tf.setText(String.valueOf(sum));
                                  }
            }
        v.addElement(new String("="));
        v2.addElement(new String("="));              
       }
      
      if (e.getActionCommand()=="1" ||                      
          e.getActionCommand()=="2" ||
          e.getActionCommand()=="3" ||
          e.getActionCommand()=="4" ||
          e.getActionCommand()=="5" ||
          e.getActionCommand()=="6" ||
          e.getActionCommand()=="7" ||
          e.getActionCommand()=="8" ||
          e.getActionCommand()=="9" ||
          e.getActionCommand()=="0" ||
          e.getActionCommand()=="."          
         )                              //1，2，3，4，5，6，7，8，9，0，.的实现；
    {     
      if(
            ("+").equals((String)v2.lastElement()) ||
             ("-").equals((String)v2.lastElement()) ||
             ("x").equals((String)v2.lastElement()) ||
             ("/").equals((String)v2.lastElement()) ||
             ("init").equals((String)v2.lastElement())            
        )
        {         
          tf.setText("");
          tf.setText(e.getActionCommand());
        }
      else if (("=").equals((String)v2.lastElement()))
           {
            sum=0;
            tf.setText("");
             tf.setText(e.getActionCommand());
           }
        else
         {
             tf.setText(tf.getText()+e.getActionCommand());//调用其父类中的getText()方法
          }
          v2.addElement(new String(e.getActionCommand()));
    }
     
   
    }
    public static void main(String args[])
    {
       new Jsqzj().init();       
    }
   
}
 

本文出自 “兰色的海洋” 博客，请务必保留此出处http://su3390.blog.51cto.com/176528/32179





    文章评论
 <<   1   2   >>   页数 ( 1/2 )  
2007-06-28 10:28:36
　　牛人哪．．

　　不知道能不能计算二进制啊？

2007-11-01 06:54:04
你把那些if换成 case会更好的

2007-11-21 19:31:42
换毛的case
你懂不

2007-11-29 21:40:17
不怎么样

2007-11-29 21:43:23
for语句
精简一下

 <<   1   2   >>   页数 ( 1/2 )  

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