Intermediate Java(22) - init for Applets

import java.awt.*;

import javax.swing.*;

public class apples extends JApplet {

private double sum;

public void init(){ → 這個method會運行在Applet

String fn = JOptionPane.showInputDialog("Enter first number");

String sn = JOptionPane.showInputDialog("Enter second number");

double n1 = Double.parseDouble(fn); → 將String轉為double

double n2 = Double.parseDouble(sn);

sum = n1 + n2;

}

public void paint(Graphics g){

super.paint(g);

g.drawString("The sum is "+sum, 25, 30);

}

}

這是運行時的結果: