Multiple tables, only one focused!

Question

No, that's not what's happening; it's what I want to happen. ;-)
I have a JFrame with a few JPanel-extensions on it. these extensions just add a JTable in a JScrollpane, and a JLabel header, to the panel (just in the constructor), so there is not unusual behaviour in the functioning of these components [JPanel extensions].
However, I want the user to be able to click on the tables one at a time ONLY: currently the user can go to each table on the main JFrame window and select it, while a row in another table is still currently selected; thus, each table on the JFrame can have a row selected, all at the same time!
How can I change this to the behaviour that I want?
Regards,
lutha

Answer 1

This isn't focus. The indicator for focus is on the individual cell which has focus. By default it's either a blue or black border depending on whether the cell is currently being edited. I think what you are talking about is selection. This is shown by change the background of the selected cells. Here's how I got rid of that.import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test3 extends JFrame implements FocusListener {
  Color selectedBackground;
  public Test3() {
    String[] head = {"One","Two","Three"};
    String[][] data = {{"R1-C1","R1-C2","R1-C3"},
                       {"R2-C1","R2-C2","R2-C3"},
                       {"R3-C1","R3-C2","R3-C3"}};
    JTable jt1 = new JTable(data, head), jt2 = new JTable(data,head);
    selectedBackground = jt1.getSelectionBackground();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    content.setLayout(new GridLayout(1,2));
    content.add(new JScrollPane(jt1));
    content.add(new JScrollPane(jt2));
    jt1.addFocusListener(this);
    jt2.addFocusListener(this);
    setSize(300, 300);
    setVisible(true);
  public void focusGained(FocusEvent fe) {
    ((JTable)fe.getSource()).setSelectionBackground(selectedBackground);
  public void focusLost(FocusEvent fe) {
    ((JTable)fe.getSource()).setSelectionBackground(((JTable)fe.getSource()).getBackground());
  public static void main(String[] args) { new Test3(); }
}