Tengo 2 JPanels y 1 JFrame, y trato de cambiar entre paneles cuando hago clic en un botón ... No quiero usar CardLayout, porque quiero paneles diferentes y con CardLayouts solo puedo tener el mismo botón para ambos . Mi código es:

package javaapplication2;

import javax.swing.JPanel;

public class NewJFrame extends javax.swing.JFrame {
/**
 * Creates new form NewJFrame
 */JPanel panel1 = new JPanel();
 JPanel panel2 = new JPanel();
public NewJFrame() {
    initComponents();
}

private void initComponents() {

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setBackground(new java.awt.Color(121, 183, 60));
    setSize(200, 300);
    setResizable(false);



    /**panel1**/
     jButton1 = new javax.swing.JButton();

    jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
        public void mouseClicked(java.awt.event.MouseEvent evt) {
            jButton1MouseClicked(evt);
        }
    });
    jButton1.setText("jButton1");
     panel1.setBackground(new java.awt.Color(121, 183, 60));
    panel1.setMaximumSize(new java.awt.Dimension(100, 200));
    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(panel1);
    panel1.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(164, 164, 164)
            .addComponent(jButton1)
            .addContainerGap(172, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(115, 115, 115)
            .addComponent(jButton1)
            .addContainerGap(158, Short.MAX_VALUE))
    );

    /**panel2**/

       jButton2 = new javax.swing.JButton();

    jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
        public void mouseClicked(java.awt.event.MouseEvent evt) {
            jButton2MouseClicked(evt);
        }
    });
    jButton2.setText("jButton2");
     panel2.setBackground(new java.awt.Color(101, 13, 61));
    panel2.setMaximumSize(new java.awt.Dimension(100, 200));
    javax.swing.GroupLayout layout2 = new javax.swing.GroupLayout(panel2);
    panel2.setLayout(layout2);
    layout2.setHorizontalGroup(
        layout2.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout2.createSequentialGroup()
            .addGap(164, 164, 164)
            .addComponent(jButton2)
            .addContainerGap(172, Short.MAX_VALUE))
    );
    layout2.setVerticalGroup(
        layout2.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout2.createSequentialGroup()
            .addGap(115, 115, 115)
            .addComponent(jButton2)
            .addContainerGap(158, Short.MAX_VALUE))
    );
   add(panel2);
    pack();
}


public void changePanel(){
    getContentPane().removeAll();
    add(panel1);
    invalidate();
    repaint();
}

private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
    changePanel();
}
 private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {
    changePanel();
}

private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;

}