product.java

还不错的java基本实例

// 计算两个整数相乘.
import javax.swing.JOptionPane;  // program uses JOptionPane
public class Product {
   public static void main( String args[] )
   {
      String firstNumber;   
      String secondNumber;  
      int number1;
      int number2;         
      int product;             
      firstNumber = JOptionPane.showInputDialog( "输入乘数" );
      secondNumber =JOptionPane.showInputDialog( "输入被乘数" );
     try {
          number1 = Integer.parseInt( firstNumber );
          number2 = Integer.parseInt( secondNumber );
       }  
catch(NumberFormatException ex)  {
            JOptionPane.showMessageDialog( null,
         "你在输入对话框中没有输入整数值","消息", JOptionPane.PLAIN_MESSAGE );
System.exit( 0 );
       }
          product = number1 * number2;
JOptionPane.showMessageDialog( null,number1+"*"+number2+"="+product ,
              "结果", JOptionPane.PLAIN_MESSAGE );
          System.exit( 0 );   // terminate application with window
     } // end method main
} // end class Product