Getting Input from the User in Java Applet

Applets work in graphical environment. Therefore applets treat input as text strings. We must first create an area of the screen in which user can type and edit input items. We can do this by using the TextField class of the applet package. The values of the fields can be given even editer after the creation of input fields. Next step is to retrieve the items from the fields for display of calculations.

For any kinds of computation on the input field, we must convert it to the right form and the resuls again converted back to strings for display.

Let us consider an example

/*
===========================================================
File Name : GettingInputfromtheUser.java
WebSite : http://javaproglang.blogspot.in/
Facebook : https://www.facebook.com/AdvanceJavaProgramming
Created By : Bintu Chaudhary
===========================================================
*/
import java.awt.*;
import java.applet.*;
public class GettingInputfromtheUser extends Applet
{
		TextField t1, t2;
		public void init()
        {
                t1 = new TextField(10);
                t2 = new TextField(10);

                add(t1);
                add(t2);

                t1.setText("0");
                t2.setText("0");
        }
        public void paint(Graphics g)
        {
                int a=0,b=0,c=0;
                String str1,str2,str;

                g.drawString("Enter the number in each box",10,50);

                try
                {
                        str1=t1.getText();
                        a=Integer.parseInt(str1);

                        str2=t2.getText();
                        b=Integer.parseInt(str2);
                }
                catch(Exception e)
                {
                }
                c=a+b;

                str=String.valueOf(c);

                g.drawString("Sum is",10,15);
                g.drawString(str,100,75);
        }
}

This applet runs using the following HTML file:

<!--
===========================================================
File Name : GettingInputfromtheUser.html
WebSite : http://javaproglang.blogspot.in/
Facebook : https://www.facebook.com/AdvanceJavaProgramming
Created By : Bintu Chaudhary
===========================================================
-->
<HTML>
<HEAD>
	<TITLE>Getting Input from the User</TITLE>
</HEAD>
<BODY>
	<APPLET Code="GettingInputfromtheUser.class" Width=400 Height=300>
	</APPLET>
</BODY>    
</HTML>

Note :- after comipling this applet program will not calculate the two variables a and b because for this we need event programming...

"Output of GettingInputfromtheUser.class"

Download Complete Program

	Section 1
	Home
	Introduction To Java
	Java Evolution
	Overview of Java
	Constants, Variables & Data Types
	Java Operators
	Branching Statements
	Looping Statements
	Section 2
	Classes, Objects & Methods
	Inheritance
	Array, String & Vectors
	Java Interfaces
	Java Packages
	Java Applet Programming
	Java Graphics Programming
Advance Java Programming
	Section 1
	Java AWT
	Java Event Handling
	Java File Handling
	Java MultiThreading
	Java Swing-I
	Java Swing-II
	Java Exception Handling
	Section 2
	Java Socket Programming
	Java Database Connectivity
	Java RMI
	Java Servlets
	Java Beans

Getting Input from the User in Java Applet

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