setEditable().

In Core Java, the correct method to set a TextComponent (such as a TextField or TextArea) to the read-only state is setEditable(boolean).

The setEditable(boolean) method allows you to control whether the text component is editable or not. If you pass false as an argument, it makes the text component read-only, preventing the user from editing its content.

Here’s an example of how you might use it:

java

import javax.swing.*;
public class ReadOnlyTextFieldExample {

    public static void main(String[] args) {

        JFrame frame = new JFrame("Read-Only TextField Example");

        JTextField textField = new JTextField("This is a read-only text field");
        // Set the text field to read-only

        textField.setEditable(false);

frame.getContentPane().add(textField); frame.setSize(300, 100); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }

In this example, the setEditable(false) method is used to make the textField read-only.