import java.awt.Graphics ;
import javax.swing.JApplet ;
import javax.swing.JOptionPane;
public class Float extends JApplet{
public void paint(Graphics g)
{
  String firstNumber;
  String secondNumber;
  String thirdNumber;
  float   first;
  float   second;
  float   third;
  float   sum,average,mul,max,min;
  firstNumber = JOptionPane.showInputDialog("Enter first number");
  secondNumber = JOptionPane.showInputDialog("Enter second number");
  thirdNumber = JOptionPane.showInputDialog("Enter third number");
//     number1 = Integer.parseInt(firstNumber);//把String转换成int
  first = Float.parseFloat(firstNumber);
  second = Float.parseFloat(secondNumber);
  third = Float.parseFloat(thirdNumber);
  sum = first + second + third;
  average = sum/3;
     if((second>first)&&(second>third))  max = second ;
       else if((second>first)&&(second<third))  max = third ;
      else max = first ;
     
     if((second<first)&&(second<third))  min = second ;
       else if((second<first)&&(second>third)) min = third ;
      else min = first ;   
      mul = first * second * third ;
      
      JOptionPane.showMessageDialog(null,"max = " + max ,"\nmin = "+ min "\naverage = "+average "\nmul = "+ mul,"VC++.NET",JOptionPane.PLAIN_MESSAGE);
                    
      System.exit(0);
}
}
//firstNumber = JOptionPane.showInputDialog("Enter first number");  编译器指示这里出错
// number1 = Integer.parseInt(firstNumber);//把String转换成int   //这是书上的对的例子

[此贴子已经被作者于2005-9-19 9:45:08编辑过]

import java.awt.Graphics ;
import javax.swing.JApplet ;
import javax.swing.JOptionPane;
public class Float1 extends JApplet{
 public void init()
 {
  String firstNumber;
  String secondNumber;
  String thirdNumber;
  float   first;
  float   second;
  float   third;
  float   sum,average,mul,max,min;
  firstNumber = JOptionPane.showInputDialog("Enter first number");
  secondNumber = JOptionPane.showInputDialog("Enter second number");
  thirdNumber = JOptionPane.showInputDialog("Enter third number");
  
  first = Float.parseFloat(firstNumber);
  second = Float.parseFloat(secondNumber);
  third = Float.parseFloat(thirdNumber);
  sum = first + second + third;
  average = sum/3;
  
     if((second>first)&&(second>third))  max = second ;
       else if((second>first)&&(second<third))  max = third ;
      else max = first ;
     
     if((second<first)&&(second<third))  min = second ;
       else if((second<first)&&(second>third)) min = third ;
      else min = first ;   
      mul = first * second * third ;
      
        String str = new String("max = " + max + "\nmin = " + min + "\naverage = "+average + "\nmul = "+ mul);
        String title = "VC++.NET";
        JOptionPane.showMessageDialog(null,str,title,JOptionPane.PLAIN_MESSAGE);
     }
     public void paint(Graphics g)
     {
      super.paint(g);
        System.exit(0);
  }
}

//这样行，  不过修改后的用html打开，还是原来的那个