floatadd.java

北京邮电大学牛导的 JAVA课件课件及相关资料

import java.awt.Graphics;
import javax.swing.JOptionPane;
import javax.swing.JApplet;
public class Floatadd extends JApplet
{
    double result;
    public void init()
    {
        String firstnumber, lastnumber;
        double first, last;
        firstnumber = JOptionPane.showInputDialog("Enter the first number");
        lastnumber =  JOptionPane.showInputDialog("Enter the first number");
        first = Double.parseDouble(firstnumber);
        last = Double.parseDouble(lastnumber);
        result = first + last;       
    }
    public void paint(Graphics g)
    {
        super.paint(g);
        g.drawRect(15, 10, 270, 20);
        g.drawString("The result is "+result,25,25);
    }
}