How to add label in AWT program in java -

import java.awt.*;

class LabelExample
{
    public static void main(String args[])
    {
        Frame f = new Frame("Label Example by TechSarvam");
        Label l1, l2;
        
        l1 = new Label("First Label.");
        l1.setBounds(50, 100, 100, 30);
        
        l2 = new Label("Second Label.");
        l2.setBounds(50, 150, 100, 30);
        
        f.add(l1);
        f.add(l2);
        f.setSize(400, 400);
        f.setLayout(null);
        f.setVisible(true);
    }
}

This is a Java program that shows how to use Label components in a simple GUI using the AWT (Abstract Window Toolkit) library. The program creates a frame and adds two labels to it. Let’s break down the program step by step.

1. Importing AWT Package

import java.awt.*;

This imports the AWT package, which provides the necessary classes for creating GUI components such as Frame, Label, etc.

2. Class Definition

class LabelExample {

This declares the LabelExample class with the main method that will execute the program.

3. Main Method

public static void main(String args[]) {

The main method is where the program starts. It will be called whenever the program is run.

4. Frame Declaration

Frame f = new Frame(“Label Example by TechSarvam”);

Here, a Frame object f is declared. The frame is a top-level window with a title. The title of the frame is “Label Example by TechSarvam”, which will appear at the top of the window.

5. Creating Label Objects

Label l1, l2;

l1 = new Label(“First Label.”);

l2 = new Label(“Second Label.”);

Two Label objects are declared:

l1 with the text “First Label.”
l2 with the text “Second Label.”

A Label is simple component for putting an ordinary small length string within a window:

6. Setting Location and Size to the Labels

l1.setBounds(50, 100, 100, 30);

l2.setBounds(50, 150, 100, 30);

The ‘setBounds() is used above is to establish where the window in which all such components placed relative to this Label’s will position in along its X as well as the Y-axis coordinates for positioning (of this JLabel also) it should have is based on that.

100: The width of the label.
30: The height of the label.
l1 will be displayed at (50, 100) with 100×30 pixels size
l2 will be displayed at (50, 150) with 100×30 pixels size

7. Adding Labels to Frame

f.add(l1);

f.add(l2);

The labels l1 and l2 will be added inside the frame f such that they would be displayed

8. Setting Frame Properties

f.setSize(400, 400);

f.setLayout(null);

f.setVisible(true);

f.setSize(400, 400);: Sets frame size to 400 pixels wide and 400 pixels tall.
f.setLayout(null);: Turns off the layout manager for the frame; thus, components must be placed in absolute position using setBounds().
f.setVisible(true);: Set frame to visible. If this line of code is not used then frame will never appear on screen.

9. Program Output

When you run the program a window (frame) should appear with all of the following features:

A window with the title “Label Example by TechSarvam”.
The window size will be 400×400 pixels.

Inside the window, there will be two labels:

The first label (“First Label.”) at the position (50, 100).
The second label (“Second Label.”) at the position (50, 150).

Example Output (Graphical UI):

A 400×400 window.

Two labels inside the window:

“First Label.” at the coordinates (50, 100).
“Second Label.” at the coordinates (50, 150).

Since the program uses setLayout(null), the labels are manually placed using setBounds() and won’t be affected by any layout manager.

Conclusion:

This program demonstrates how to implement a simple framed application displaying labels in the Java AWT environment. The program does the following:

It declares a Frame object with a name and assigns the name “Java Frame.”
Declares two Label objects and assigns text to both.
Uses setBounds() to size and position the labels
Adds the two labels to the frame
Makes the frame visible at a predefined size

The window will come out with the two labels appropriately positioned.