title: Two buttons changing panel color to red or blue
body: <p>my first post here. I'm currently in school and usually spend my time here on Stackoverflow looking for answers to homework, this time i'd thought that perhaps i'll put my code here and maybe i'll get help more precis and quicker! Anyways, my problem is that i've written a code which you can see below, and I'm new to swing, studied it for a few hours only. My problem is that I'm not quite sure how to proceed with my problem, I have 2 buttons, what i want is when you click on first button the panel will change to Red, second button the panel changes to blue, so far only Red works and I don't know how to implement it so that blue works aswell.</p>
  
  <p>Would greatly appreciate your help! (Don't be shy about pointing out a few errors or help along the way that doesn't have with the buttons to do, as I said, I'm new :P)</p>
  
  <pre><code>public class FirstProgram extends JFrame {
  
      public FirstProgram() {
  
          initUI();
      }
  
      private void initUI() {
  
          JPanel panel = new JPanel();
          panel.setBackground(Color.yellow);
          getContentPane().add(panel);
          panel.setLayout(null);
  
          JButton Colorbutton = new JButton("Red");
          Colorbutton.setBounds(50, 60, 80, 30);
          Colorbutton.setToolTipText("Panel changes to red");
          Colorbutton.setBackground(Color.green);
  
          JButton Colorrbutton = new JButton("Blue");
          Colorrbutton.setBounds(1, 30, 90, 30);
          Colorrbutton.setToolTipText("Panel changes to blue");
          Colorrbutton.setBackground(Color.orange);
  
          Colorbutton.addActionListener(new ActionListener() {
              @Override
              public void actionPerformed(ActionEvent event) {
                  panel.setBackground(Color.red);
  
              }
          });
  
          panel.add(Colorbutton);
          panel.add(Colorrbutton);
          setTitle("Time to change colors");
          setSize(300, 200);
          setLocationRelativeTo(null);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
      }
  
      public static void main(String[] args) {
  
          SwingUtilities.invokeLater(new Runnable() {
              @Override
              public void run() {
                  FirstProgram ex = new FirstProgram();
                  ex.setVisible(true);
              }
          });
      }
  }
  </code></pre>