This section illustrates you how to change the label of a button in java swing. JButton is the component of javax.swing.*; package.
The following program helps you to change the label of the button. In this program, the label of the button is changed from "Click Me" to "Roseindia.net" and vice versa whenever you click on the button as shown below:
Before:

After:

In this program, addActionListener() method has been added to the button to register the action listener and then if you click on the button, the generated action event is captured in the actionPerformed(ActionEvent e) method. In the actionPerformed(ActionEvent e){ we check the label of the button. If the label of the button is "Roseindia.net", it will change the button label to "Click Me" otherwise it will change the label to "Roseindia.net".
setText(String):
Above method sets the label of the
button.
Here is the code of the program:
import javax.swing.*;
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