Deselect default selection on JTextfield

Question

When using JTextFields i like to set a default text.

Then i run the program and this default text will automatically be selected (at least when you have only one field). In other words, if I type a letter right away, the default text will be deleted and replaced by the new one.

My question is how I can change the default settings in a way that allows me to type a letter without deleting the default text? I would like the letter to just be added at the end of the default text.

Here's my code:

    public class ButtonsNText extends JPanel implements ActionListener, KeyListener {

private JTextField TextLine;
private JToggleButton UpperCaseButton;
private JToggleButton LowerCaseButton;
private JCheckBox ContinuousButton;
private ButtonGroup myButtonGroup;

public ButtonsNText(){
    TextLine = new JTextField(10);
    add(TextLine); TextLine.setName("TextLine");
    TextLine.setText("default text"); 
    TextLine.setCaretPosition(TextLine.getText().length());
    TextLine.addKeyListener(this);
    myButtonGroup = new ButtonGroup();
    UpperCaseButton = new JToggleButton("Upper case");
    add(UpperCaseButton);UpperCaseButton.setName("UpperCaseButton");
    LowerCaseButton = new JToggleButton("Lower case");
    add(LowerCaseButton); LowerCaseButton.setName("LowerCaseButton");
    ContinuousButton = new JCheckBox("Continuous?");
    add(ContinuousButton); ContinuousButton.setName("ContinuousButton");
    myButtonGroup.add(UpperCaseButton); myButtonGroup.add(LowerCaseButton);
    UpperCaseButton.addActionListener(this);
    LowerCaseButton.addActionListener(this);
    ContinuousButton.addActionListener(this);

}
public static void main(String[] args) {
    JFrame frame = new JFrame("Hello world example");
    frame.add(new ButtonsNText());
    frame.pack();
    frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
    if(e.getSource() == UpperCaseButton){
        TextLine.setText(TextLine.getText().toUpperCase());
    }
    else if(e.getSource() == LowerCaseButton){
        TextLine.setText(TextLine.getText().toLowerCase());
    }
}
@Override
public void keyReleased(KeyEvent k) {
    if(ContinuousButton.isSelected()){
        if(UpperCaseButton.isSelected()){
            int pos = TextLine.getCaretPosition();
            TextLine.setText(TextLine.getText().toUpperCase());
            TextLine.setCaretPosition(pos);
        }
        else if(LowerCaseButton.isSelected()){
            int pos = TextLine.getCaretPosition();
            TextLine.setText(TextLine.getText().toLowerCase());
            TextLine.setCaretPosition(pos);

        }
    }
    int key = k.getKeyCode();
    if(key == KeyEvent.VK_ENTER){
        if(UpperCaseButton.isSelected()){
            TextLine.setText(TextLine.getText().toUpperCase());
        }
        else if(LowerCaseButton.isSelected()){
            TextLine.setText(TextLine.getText().toLowerCase());
        }
    }
}

}

I have tried things like isFocusable(), setFocusable(), setCaterPosition() and other similar methods, but here I think I need a different approach.

Answer 1

Just add one FocusListener for focus Gained, that will do for you along with tfield2.setCaretPosition(tfield2.getDocument().getLength()); Here see the code for your help :

import java.awt.event.*;

import javax.swing.*;

public class TextFieldExample extends JFrame
{
    public TextFieldExample()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JPanel contentPane = new JPanel();
        JTextField tfield = new JTextField(10);
        final JTextField tfield2 = new JTextField(10);
        tfield2.setText("default text");
        tfield2.addFocusListener(new FocusListener()
        {
            public void focusGained(FocusEvent fe)
            {
                tfield2.setCaretPosition(tfield2.getDocument().getLength());
            }

            public void focusLost(FocusEvent fe)
            {
            }
        });

        contentPane.add(tfield);
        contentPane.add(tfield2);

        setContentPane(contentPane);

        pack();
        setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new TextFieldExample();
            }
        });
    }
}