Java Program To Change JLabel Text After Creation - Tutorialspoint

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In this article, we will learn to change JLabel text after creation in Java. We'll cover two scenarios: changing the label text immediately after creation and updating it in response to a button click.

Different approaches to change JLabel text after creation

Below are the different approaches to change JLabel text after the creation ?

  • Using setText() Method
  • Using a button click

Update JLabel text using setText() method

Following are the steps to update JLabel text immediately after creation ?

  • First we will import JFrame, JLabel, and Font from javax.swing and java.awt.
  • Create JFrame and JLabel by instantiating a JFrame and a JLabel, and set the label's initial text.
  • Change the label text by using setText() on the label to update its text.
  • Add the label to the frame, set the frame's size and layout, and make it visible.

Example

Below is the Java program to change JLabel text after creation ?

import java.awt.Font; import javax.swing.*; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Label Example"); JLabel label; label = new JLabel("First Label"); label.setBounds(50, 50, 100, 30); label.setFont(new Font("Verdana", Font.PLAIN, 13)); // changing text label.setText("Updated text"); frame.add(label); frame.setSize(500,300); frame.setLayout(null); frame.setVisible(true); } }

Output

Update JLabel text using a button click

Following are the steps to change JLabel text after creation using a button click ?

  • Import JFrame, JLabel, JButton from javax.swing and ActionEvent, ActionListener from java.awt.event
  • Instantiate a JFrame, a JLabel with initial text, and a JButton.
  • Attach an ActionListener to the button to change the label's text when clicked.
  • Add both the label and button to the frame, set the frame's size and layout, and make it visible.

Example

import java.awt.Font; import javax.swing.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Label Example"); JLabel label = new JLabel("First Label"); label.setBounds(50, 50, 200, 30); label.setFont(new Font("Verdana", Font.PLAIN, 13)); JButton button = new JButton("Change Text"); button.setBounds(50, 100, 150, 30); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { label.setText("Text changed on button click"); } }); frame.add(label); frame.add(button); frame.setSize(500, 300); frame.setLayout(null); frame.setVisible(true); } }

Output

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