How to add buttons and panels in frame in java?

Java Mortgage Calculator Problem?

• /* Week 4: Individual Assignment PRG 421 Programmer: Robert Hazekamp Change Request #6 Service Request SR-mf-003 Purpose: Write the program in Java (with a graphical user interface) so that it will allow the user to select which way they want to calculate a mortgage: by input of the amount of the mortgage, the term of the mortgage, and the interest rate of the mortgage payment or by input of the amount of a mortgage and then select from a menu of mortgage loans: - 7 year at 5.35% - 15 year at 5.5 % - 30 year at 5.75% In either case, display the mortgage payment amount and then, list the loan balance and interest paid for each payment over the term of the loan. Allow the user to loop back and enter a new amount and make a new selection, or quit. Insert comments in the program to document the program. */ //opening libraries import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.text.NumberFormat; import javax.swing.JOptionPane; //declaring content public class mortgageguiwk4 extends JFrame implements ActionListener { public static void main(String[] args) { // TODO code application logic here } //adding initial selection options via RadioButtons JPanel row_aa = new JPanel(); JRadioButton opt1 = new JRadioButton("Manual Input", true); JRadioButton opt2 = new JRadioButton("Menu Selections", false); //content Buttons, Panels, Labels, and TextFields JPanel row_a = new JPanel(); JLabel amntLabel = new JLabel(); JTextField loanField = new JTextField(); JLabel loan2Label = new JLabel(); JPanel row_b = new JPanel(); JPanel row_b1 = new JPanel(); JLabel termLabel = new JLabel(); //term JTextField termField = new JTextField(4); JPanel row_b2 = new JPanel(); JLabel int_entryLabel = new JLabel(); //interest JTextField int_entryField = new JTextField(3); JComboBox options = new JComboBox(); JLabel optionsLabel = new JLabel(); JPanel row_c = new JPanel(); JButton calButton = new JButton(); JButton resetButton = new JButton(); JButton endButton = new JButton(); JPanel row_d = new JPanel(); JLabel paymtLabel = new JLabel(); JTextField paymtField = new JTextField(); JPanel row_e = new JPanel(); JLabel outputLabel = new JLabel(); JPanel row_f = new JPanel(); JTextArea opField = new JTextArea(5, 55); JScrollPane scrollPane = new JScrollPane(opField, ScrollPaneConstants.VERTICAL_SCROLLBAR_A… ScrollPaneConstants.HORIZONTAL_SCROLLBAR… ButtonGroup radioSelect = new ButtonGroup(); private String i; //setting format of GUI layout public mortgageguiwk4() { //main GUI Dimensions super("mortgateguiWeek 4- Loan Calculator with Preselected or Customized Values"); setSize(900, 265); new GridLayout(6, 4, 10, 10); FlowLayout flowCenter = new FlowLayout(FlowLayout.CENTER); FlowLayout flow = new FlowLayout(FlowLayout.LEFT); Container pane = getContentPane(); pane.setLayout(flow); setDefaultCloseOperation(WindowConstants… setVisible(true); //setting actionListeners for Fields and Buttons loanField.addActionListener(this); termField.addActionListener(this); int_entryField.addActionListener(this); options.addActionListener(this); calButton.addActionListener(this); resetButton.addActionListener(this); endButton.addActionListener(this); opt1.addActionListener(this); opt2.addActionListener(this); //layout for mortgage amount entry row_a.setLayout(flow); amntLabel.setText("Please Enter Loan Amount w/o Commas:"); row_a.add(amntLabel); row_a.add(loanField); radioSelect.add(opt1); radioSelect.add(opt2); pane.add(row_a); //layout for options options.addItem("7 years at 5.35%"); options.addItem("15 years at 5.5%"); options.addItem("30 years at 5.75%"); options.setEnabled(false); row_b.setLayout(flow); row_b.add(options); pane.add(row_b); row_b1.setLayout(flow); termLabel.setText("Term in Years"); row_b1.add(termLabel); row_b1.add(termField); pane.add(row_b1); row_b2.setLayout(flow); int_entryLabel.setText("Interest %"); row_b2.add(int_entryLabel); row_b2.add(int_entryField); pane.add(row_b2);

• Answer:

  you should try the three calculations with the while loops to respond to each of the action listeners :)!