JLabel - An Example

How to create and use JLabel

  

In java, labels are components used to hold the texts. A Label will look like "Text engraved   in the container(may be  a frame or panel)".

In general what is meant by a Label?

 A Label is a piece of a paper that provides information about the object to which it is affixed with. Similarly, here also the sole purpose of a label  is to provide information about the object  that cannot able to identify itself to the user.

Say, for  an example, In java,On seeing a button we can able to tell what it is intended to do, like NEXT, CANCEL, but a text field , text area cannot be able to describe themselves. So, in these kind of situations labels helps us to identify them.

Creating a Label 

In order to create a label,we need to create an object for the JLabel class by giving the text to be displayed as a label, like

JLabel l1=new JLabel("NAME");

JLabel l2=new JLabel(ADDRESS);

Program:

 

LabelDemo.java

import java.util.*;
import javax.swing.*;
import java.awt.*;
class LabelDemo extends JFrame
{
public LabelDemo()
{
setSize(300,300);
setTitle("LabelDemo");
setLayout(new FlowLayout(FlowLayout.CENTER,0,100));
setLocationByPlatform(true);
JPanel p=new JPanel();
JLabel l1=new JLabel("NAME :");
p.add(l1);
JTextField tf=new JTextField(20);
tf.setColumns(10);
p.add(tf);
add(p);
}
}

LabelMain.java

import java.util.*;
import javax.swing.*;

class LabelMain
{
public static void main(String args[])
{
LabelDemo ld=new LabelDemo();
ld.setVisible(true);
ld.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

output:

 

In java, there is a facility available for us to either add an image , or an image along with the text into a label.Let's see how to add an image into a label.

JLabel l1=new JLabel(new ImageIcon("Nature.jpg"));

JLabel l2=JLabel("Nature",new ImageIcon("Nature.jpg"),SwingConstants.LEFT);

In tha above example, if you modify the Label creation statement like  as follows it will enable you to add  an image to a label.