java对话框形式实现加减乘除

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

public class sumit{
   public static void main( String args[] )
   {
      String firstNumber,   // first string entered by user
             secondNumber;  // second string entered by user
      int number1,          // first number to add
          number2;         // second number to add

      // 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" );

      // convert numbers from type String to type int
      number1 = Integer.parseInt( firstNumber );
      number2 = Integer.parseInt( secondNumber );

      // display the results
      JOptionPane.showMessageDialog(
         null, "The sum is: / 和数是:  " +(number1+number2)
         +"\n"+"The difference is: / 减数是："+(number1-number2)
         +"\n"+"The product is: / 积是:"+(number1*number2)
         +"\n"+"The division is: / 商是："+(number1/number2)
       );

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