title: Adding the same components to multiple panels?
body: <p>I'm using Swing and I am trying to add the same components to multiple panels.  However, only the panel I add to the frame last has these buttons. I am adding the same set of labels/textfields to p2, p3, and p4. But since I added the labels/textfields to p4 last, it seems to show only p4 as having it. How can I re-use these components for multiple JPanels so I don't have to make a ton of them for each different panel?</p>
  
  <p>The code I am using: </p>
  
  <pre><code>public class TriangleGUI extends JFrame implements ActionListener
  {
      static JPanel p1, p2, p3,p4,p5;
      static JButton b1, b2, b3;
      static JLabel label1, label2, label3;
      static JTextField tf1, tf2, tf3;
      private static int side1, side2, side3, angle1, angle2, angle3; 
      public TriangleMadnessGUI(){
          setSize(800,400);
          p1 = new JPanel();
          p2 = new JPanel();
          p3 = new JPanel();
          p4 = new JPanel();
  
          b1 = new JButton("1 Side, 2 Angles"); //buttons
          b2 = new JButton("1 Angle, 2 Sides");
          b3 = new JButton("3 Sides");
  
          label1 = new JLabel("Angle 1");       //labels which i intend to reuse                                                 
          label2 = new JLabel("Angle 2");
          label3 = new JLabel("Side 1");
  
          tf1 = new JTextField("",5);           //textfields which i intend to reuse
          tf2 = new JTextField("",5);
          tf3 = new JTextField("",5);
  
          p1.add(b1);
          p1.add(b2);
          p1.add(b3);
  
          p2.add(label1);  //panel 2, add set of components
          p2.add(tf1);
          p2.add(label2);
          p2.add(tf2);
          p2.add(label3);
          p2.add(tf3);
  
          p3.add(label1);  //panel 3, adding set of same components
          p3.add(tf1);
          p3.add(label2);
          p3.add(tf2);
          p3.add(label3);
          p3.add(tf3);
  
          p4.add(label1);  //panel 4, adding set of same components
          p4.add(tf1);
          p4.add(label2);
          p4.add(tf2);
          p4.add(label3);
          p4.add(tf3);
  
          add(p1, BorderLayout.NORTH);
          add(p4, BorderLayout.CENTER);   // &lt;-----HERE, only p4 has visible buttons
                                          // p2 and p3 are just blank if used in here.
          setVisible(true);
      }
  }
  </code></pre>