四则运算之窗口显示

//加减乘除运算
import javax.swing.JOptionPane;
public class Yunsuan {
     public static void main( String args[] )
       {
          String firstNumber,   // 输入第一个数
                 secondNumber;  // 输入第二个数
          int number1,         
              number2,          
              sum,
              cha,
              ji,
              shang;             

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

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

          number1 = Integer.parseInt( firstNumber ); 
          number2 = Integer.parseInt( secondNumber );

          // 加法
          sum = number1 + number2;
          //减法
          cha = number1 - number2;
          //乘法
          ji = number1 * number2;
          //除法
          shang = number1 / number2;

          // 结果显示
          
                  JOptionPane.showMessageDialog(
                             null, "和为 " + sum +"\n"+
                             "差为：" +cha +"\n"+
                             "积为：" + ji + "\n"+ 
                             "商为" +shang +"\n",
                             "Results",
                             JOptionPane.PLAIN_MESSAGE 
                             );
      
         
          System.exit( 0 );   // terminate the program
       }

}