import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
//class header
//Frame=top-level container | the MortgageCalc class will be a subclass of "Frame"
//ActionListener tells program to listen for/respond to user event
public class MortgageCalc extends Frame implements ActionListener
{
//declare variables
private Button calculateBTN;
private Button quitBTN;
private TextField amountTXF;
private TextField termTXF;
private TextField rateTXF;
private DecimalFormat calcPattern;
private boolean hitCalculate;
private Panel calcPNL;
private Panel textFieldsPNL;
private Label amountLBL;
private Label rateLBL;
private Label termLBL;
//constructor method header
public MortgageCalc()
{
//creates menu bar
MenuBar mnuBar = new MenuBar();
setMenuBar(mnuBar);
//adds "File" to menu bar
Menu mnuFile = new Menu("File", true);
mnuBar... displayed 300 characters
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