Java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package star;

/**
 *
 * @author flashery
 */
import java.awt.Color;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.*;

public class StarAnimate extends JFrame implements ItemListener {

    JPanel panel = new JPanel();
    
    JRadioButton btnBoard1 = new JRadioButton("Board 1", true);
    JRadioButton btnBoard2 = new JRadioButton("Board 2");
    JRadioButton btnBoard3 = new JRadioButton("Board 3");
    
    Board board1 = new Board();
    Board2 board2 = new Board2();
    Board3 board3 = new Board3();

    public StarAnimate() {
        init();
    }

    private void init() {

        btnBoard1.setBounds(5, 10, 100, 30);
        btnBoard1.setBackground(Color.red);
        btnBoard1.addItemListener(this);

        btnBoard2.setBounds(5, 40, 100, 30);
        btnBoard2.setBackground(Color.red);
        btnBoard2.addItemListener(this);

        btnBoard3.setBounds(5, 70, 100, 30);
        btnBoard3.setBackground(Color.red);
        btnBoard3.addItemListener(this);

        panel.setLayout(null);
        panel.setBounds(0, 0, 160, 540);
        panel.setBackground(Color.red);

        panel.add(btnBoard1);
        panel.add(btnBoard2);
        panel.add(btnBoard3);


        this.add(panel);

        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setSize(560, 540);
        this.setLayout(null);
        this.setLocationRelativeTo(null);
        this.setTitle("Star Animation");
        this.setResizable(true);
        this.setVisible(true);
    }

    public static void main(String[] args) {
        StarAnimate star = new StarAnimate();
    }

    @Override
    public void itemStateChanged(ItemEvent e) {

        if (e.getSource() == btnBoard1) {
            
            
            this.add(board1);
            this.remove(board2);
            this.remove(board3);
        }
        if (e.getSource() == btnBoard2) {
            this.add(board2);
            this.remove(board1);
            this.remove(board3);
        }
        if (e.getSource() == btnBoard3) {
            this.add(board3);
            this.remove(board2);
            this.remove(board1);
        }

    }
}

Note: C:\Users\flashery\Documents\NetBeansProjects\Timer\src\MainTimer.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.