消息框四则运算

源代码

import javax.swing.JOptionPane;  // import class JOptionPane

 

public class Addition1 {

 

    public static void main(String[] args)

    {

        //

        String firstNumber,fuhao,  secondNumber;     

        int number1,          // first number to add

        number2,            // second number to add

       fuhao1;              //fuhao1 to add;

        double  sum, subtract,multiply,chu;

  // read in first number from user as a string

  firstNumber =JOptionPane.showInputDialog( "Enter first integer" );

  // read in second number from user as a string

  secondNumber =JOptionPane.showInputDialog( "Enter second integer" );

  // read in operational character from user as a string

  fuhao=JOptionPane.showInputDialog("Enter yusuanfu：(1+ 2- 3* 4/)");

  number1 = Integer.parseInt( firstNumber );

  number2 = Integer.parseInt( secondNumber );

  fuhao1=Integer.parseInt( fuhao );

  sum = (double)number1 + number2;

  subtract=(double)number1 - number2;

  multiply=(double)number1*number2;

  chu=(double)number1/number2;

  switch(fuhao1)

     {

     case 1:  JOptionPane.showMessageDialog(null, "两数相加等于 " + sum, "Results",JOptionPane.PLAIN_MESSAGE );break;

     case 2:  JOptionPane.showMessageDialog(null,"两数相减等于"+subtract,"Result",JOptionPane.PLAIN_MESSAGE);break;

     case 3:  JOptionPane.showMessageDialog(null,"两数相乘等于"+multiply,"Result",JOptionPane.PLAIN_MESSAGE);break;

     case 4:   JOptionPane.showMessageDialog(null,"两数相除等于"+chu,"Result",JOptionPane.PLAIN_MESSAGE);break;

     default: System.exit( 0 ); 

 

     }

          System.exit( 0 );   // terminate the program

    }

 

}

结果截图