BCSL043 June 2015 set 3 solved Paper

Question 1- Write a Java program to create an applet to find the sum of three numbers. Use proper GUI components and layout in your program.

Solution -

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class three_sum_applet extends Applet implements ActionListener
{
Label l1 = new Label("First Number");
Label l2 = new Label("Second Number");
Label l3 = new Label("Third Number");
TextField t1 = new TextField(5);
TextField t2 = new TextField(5);
TextField t3 = new TextField(5);
  Button b1 = new Button("Add");
  Font f1 = new Font("Arial",Font.BOLD, 25);
  String str="";
public void init()
{
add(l1);
add(t1);
add(l2);
add(t2);
add(l3);
add(t3);
add(b1);
b1.addActionListener(this);
}
public void paint(Graphics g)
{
g.setFont(f1);
        g.drawString(str,130,100);
}
public void actionPerformed(ActionEvent e)
{
int num1 = Integer.parseInt(t1.getText());
int num2 = Integer.parseInt(t2.getText());
int num3 = Integer.parseInt(t3.getText());
        int sum = num1+num2+num3;
        str = "Sum of three number ="+sum;
        repaint();
}
}

/*  <applet code="three_sum_applet.class" width="520" height="350"></applet> */

filename: three_sum_applet.java

For compiling the file type this command in cmd: javac three_sum_applet.java
For execution of the file use this command: appletviewer three_sum_applet.java

Output:

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