Using JComboBox with ActionListener in GUI - user-interface

Question

I've just begun coding in Java and was wondering how to achieve this. What I want is for the user to be able to select what sub topic they would like to study, and then a new panel with text opens as the sub-topic is clicked. I've been trying everything i know but nothing seems to work. Any help would be appreciated. Thanks.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class FinalPanel extends JPanel {
private JLabel jcomp1;
private JComboBox jcomp2;
private JComboBox jcomp3;
private JComboBox jcomp4;
private JComboBox jcomp5;
private JLabel jcomp6;
public FinalPanel() {
//construct preComponents
String[] jcomp2Items = {"Introduction", "Summary ", "Terms"};
String[] jcomp3Items = {"Review Test"};
String[] jcomp4Items = {"Conversion Factors", "Calculations", "Problems a"};
String[] jcomp5Items = {"Limiting ", "Problems 1", "Percent Yield", "Problems 2",
"Energy Changes", "Problems 3", "Heat of Reaction", "Problems 4"};
//construct components
jcomp1 = new JLabel ("Welcome to the LifeSaving Chemistry Study guide!");
jcomp2 = new JComboBox (jcomp2Items);
jcomp3 = new JComboBox (jcomp3Items);
jcomp4 = new JComboBox (jcomp4Items);
jcomp5 = new JComboBox (jcomp5Items);
jcomp6 = new JLabel ("Stoichiometry");
//adjust size and set layout
setPreferredSize (new Dimension (644, 332));
setLayout (null);
//add components
add (jcomp1);
add (jcomp2);
add (jcomp3);
add (jcomp4);
add (jcomp5);
add (jcomp6);
//set component bounds (only needed by Absolute Positioning)
jcomp1.setBounds (155, 20, 370, 20);
jcomp2.setBounds (90, 140, 175, 25);
jcomp3.setBounds (370, 205, 175, 30);
jcomp4.setBounds (90, 210, 175, 25);
jcomp5.setBounds (370, 140, 175, 25);
jcomp6.setBounds (265, 55, 100, 25);
}
public static void main (String[] args) {
JFrame frame = new JFrame ("MyPanel");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new FinalPanel());
frame.pack();
frame.setVisible (true);
}
public void actionPerformed (ActionEvent e){
JFrame frame2 = new JFrame ("Clicked");
frame2.setVisible(true);
frame2.setSize(500,600);
JLabel label= new JLabel("Summary");
JLabel panel= new JLabel();
frame2.add(panel);
panel.add(label);
}
}