题目

如何使用Java对象语言编写一个加减乘除计算器要有代码

提问时间：2021-01-22

答案

下面文件名要为：JiSuanQi.java

import java.awt.*;

import java.awt.event.*;

public class JiSuanQi

{

   String s="",s1=null,s2=null;

   Frame f=new Frame("计算器");

  TextField tf=new TextField(30);

  Panel p1=new Panel();

  Panel p2=new Panel();

  Panel p3=new Panel();

  Button bt1=new Button("=");

  Button bt2=new Button("删除");

  Button[] bt=new Button[16];

  int id=0;

   public static void main(String[] args)

   {

       new JiSuanQi().init();

   }

    public void init()

    {

       f.setBackground(new Color(85,247,253));

       f.setLayout(new BorderLayout(4,4));

       p2.setLayout(new GridLayout(4,4,4,4));

       p3.setLayout(new BorderLayout(4,4));

       f.setResizable(false);

       f.add(p1,BorderLayout.NORTH);

       f.add(p2);

       p3.add(bt2,BorderLayout.NORTH);

       p3.add(bt1);

       p1.add(tf);

       f.add(p3,BorderLayout.EAST);

       String[] b={"1","2","3","+","4","5","6","-","7","8","9","*","0",".","复位","/"};

       for(int i=0;i<16;i++)

       {

           bt[i]=new Button(b[i]);

           p2.add(bt[i]);

       }

       bt[0].setForeground(Color.blue);

       bt[1].setForeground(Color.blue);

       bt[2].setForeground(Color.blue);

       bt[4].setForeground(Color.blue);

       bt[5].setForeground(Color.blue);

       bt[6].setForeground(Color.blue);

       bt[8].setForeground(Color.blue);

       bt[9].setForeground(Color.blue);

       bt[10].setForeground(Color.blue);

       bt[12].setForeground(Color.blue);

       bt[13].setForeground(Color.blue);

       bt[3].setForeground(Color.red);

       bt[7].setForeground(Color.red);

       bt[11].setForeground(Color.red);

       bt[15].setForeground(Color.red);

       bt[14].setForeground(Color.red);

       bt1.setForeground(Color.red);

       bt2.setForeground(Color.red);

       f.pack();

       f.setVisible(true);

       f.addWindowListener(new WindowAdapter()

       {

          public void windowClosing(WindowEvent e)

          {

             System.exit(0); 

          } 

       }

       );

       bt[0].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=1;

                 s2+=1;

                 tf.setText(s);

           }

       }

       );

          bt[1].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=2;

                 s2+=2;

                 tf.setText(s);

           }

       }

       );

       bt[2].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=3;

                 s2+=3;

                 tf.setText(s);

           }

       }

       );

       bt[4].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=4;

                 s2+=4;

                 tf.setText(s);

           }

       }

       );

       bt[5].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=5;

                 s2+=5;

                 tf.setText(s);

           }

       }

       );

       bt[6].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=6;

                 s2+=6;

                 tf.setText(s);

           }

       }

       );

       bt[8].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=7;

                 s2+=7;

                 tf.setText(s);

           }

       }

       );

       bt[9].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=8;

                 s2+=8;

                 tf.setText(s);

           }

       }

       );

       bt[10].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=9;

                 s2+=9;

                 tf.setText(s);

           }

       }

       );

       bt[12].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+=0;

                 s2+=0;

                 tf.setText(s);

           }

       }

       );

       bt[13].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s+='.';

                 s2+='.';

                 tf.setText(s);

           }

       }

       );

       bt[3].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s1=s;

                 s+='+';

                 id=1;

                 s2="";

                 tf.setText(s);

           }

       }

       );

       bt[7].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s1=s;

                 s+='-';

                 id=2;

                 s2="";

                 tf.setText(s);

           }

       }

       );

       bt[11].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s1=s;

                 s+='*';

                 id=3;

                 s2="";

                 tf.setText(s);

           }

       }

       );

       bt[14].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s="";

                 s2="";

                 tf.setText(s);

           }

       }

       );

       bt[15].addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 s1=s;

                 s+='/';

                 id=4;

                 s2="";

                 tf.setText(s);

           }

       }

       );

       bt1.addActionListener(new ActionListener()

       {

           public void actionPerformed(ActionEvent e)

           {

                 if(id<1) ;

                    else{

                     s+='=';

                     double a=Double.parseDouble(s1);

                     double b=Double.parseDouble(s2);

                     double c=0;

                     switch(id)

                     {

                       case 1:c=a+b; break;

                       case 2:c=a-b; break;

                       case 3:c=a*b; break;

                       case 4:c=a/b; break;

                     }             

                   s+=c;  

                   tf.setText(s);

                   }          

                 s="";s1="";s2="";id=0;

           }

       }

       );

       bt2.addActionListener(new ActionListener()

       {

               public void actionPerformed(ActionEvent e)

               { 

             char[] c1;

             char[] c2=new char[s.length()-1];

             c1=s.toCharArray();

             for(int i=0;i<s.length()-1;i++)

                 c2[i]=c1[i];

             s=s.valueOf(c2); 

             

             

             if(id<1)

             {

                s1=s;

             }

            if(s2.length()>=1)

            {

             char[] c3;

             char[] c4=new char[s2.length()-1];   

             c3=s2.toCharArray();

             for(int i=0;i<s2.length()-1;i++)

             c4[i]=c3[i];

             s2=s2.valueOf(c4);   

             } 

                    tf.setText(s);   

               }

       }

       );

    }

}