public void itemStateChanged(ItemEvent e){}
Hello! I am a student majoring in IT - Programming and have very little experience writing code and really need some help here. I am having trouble with my code. I seems that I have the correct braces, however, I could use some guidance on this. I've posted my code for full view:
import java.awt.*;// a java class that provides graphical user interfaces (GUIs)
import java.awt.event.*;// the listener interface for receiving item events
import javax.swing.*;// a GUI component kit for building UIs & handling end user input
import java.awt.Graphics;//
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.text.NumberFormat;
import java.util.*;
//import javax.swing.border.TitledBorder;// interface to describe the border around the edges of a swing component.
class GraphPanel extends JPanel {// open graph panel class
int[] bars = new int[0];
public void setValues(int[] values) {
bars = values;
}
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setBackground(Color.BLUE);
g2d.clearRect(0, 0, getWidth(), getHeight());
}
}
public class ElizabethJacksonMortgageWeek2 extends JFrame implements ItemListener, ActionListener {
NumberFormat formatter = NumberFormat.getCurrencyInstance(Locale.US);/*currency number formatter*/
/* Defining and Using JPanel to set-up and hold the labels & text fields components */
JPanel p1 = new JPanel();
JLabel loanlabel = new JLabel("Enter Loan Amount, no commas: ", JLabel.RIGHT);
JTextField loanamount = new JTextField(10);
JPanel p2 = new JPanel();
JLabel termlabel = new JLabel("Enter Loan Term: ", JLabel.RIGHT);
JTextField term = new JTextField(10);
JPanel p3 = new JPanel();
JLabel interestlabel = new JLabel("Enter Mortgage Rate, with appropriate decimal: ", JLabel.RIGHT);
JTextField interestrate = new JTextField(10);
JPanel p4 = new JPanel();
JLabel paymentlabel = new JLabel("Your monthly payment is: ", JLabel.RIGHT);
JTextField monthlypayment = new JTextField(10);
JPanel p5 = new JPanel();
JButton calc = new JButton("Calculate Mortgage Payment");
JButton reset = new JButton("Reset");
JButton cancel = new JButton("Cancel");
GraphPanel p6 = new GraphPanel();
public ElizabethJacksonMortgageWeek2(){
super(" Free Mortgage Calculator");
setSize(700, 800);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = getContentPane();
pane.setLayout(layout);
GridLayout layout = new GridLayout(10, 20, 30, 5);
FlowLayout layout1 = new FlowLayout(FlowLayout.LEFT, 5, 5);
p1.setLayout(layout1);
p1.addLabel(loanLabel);
p1.add(loanamount);
pane.add(p1);
FlowLayout layout2 = new FlowLayout(FlowLayout.LEFT, 5, 5);
p2.setLayout(layout2);
p2.add(termLabel);
p2.add(term);
pane.add(p2);
FlowLayout layout3 = new FlowLayout(FlowLayout.LEFT, 5, 5);
p3.setLayout(layout3);
p3.add(interestLabel);
p3.add(interestrate);
pane.add(p3);
FlowLayout layout4 = new FlowLayout(FlowLayout.LEFT, 5, 5);
p4.setLayout(layout4);
p4.add(paymentLabel);
p4.add(paymentamount);
pane.add(p4);
FlowLayout layout5 = new FlowLayout(FlowLayout.CENTER, 5, 5);
p5.setLayout(layout5);
p5.add(calc);
p5.add(reset);
p5.add(cancel);
ElizabethJacksonMortgageWeek2.this.setVisible(false);
pane.add(p5);
FlowLayout layout6 = new FlowLayout(FlowLayout.LEFT);
pane.add(p6);
setVisible(true);
/* Register listeners */
calc.addActionListener(this);
reset.addActionListener(this);
cancel.addActionListener(this);
pack();
}
//public static void main(String[] arguments) {
//ElizabethJacksonMortgageWeek2 frame = new ElizabethJacksonMortgageWeek2();
//}
/* Function to handle action events */
public void actionPerformed(ActionEvent e) {
/*reset input text fields*/
if(e.getSource().equals(reset))
loanamount.setText(null);
term.setText(null);
interestrate.setText(null);
monthlypayment.setText(null);
p6.setValues(new int[0]);
/* exiting the application*/
if(e.getSource().equals(cancel))
System.exit(0);
/*calculate the monthly mortgage payment*/
if(e.getSource().equals(calc));
}
public static void main (String args [ ]) {
ElizabethJacksonMortgageWeek2 frame = new ElizabethJacksonMortgageWeek2();
double prvalue, rate, interest;/* Modern processors that have been optimized for high-speed mathematical calculations */
interest = (rate/100);/* Monthly interest rate */
int years;/* Number of years on loan */
interest = ((prvalue * rate) / 12);
/* Computation of monthly mortgage payment */
double mopay = (prvalue * interest) / (1 - Math.pow(1/(1 + interest), years * 12));
//monthlypayment.setText(formatter.format(mopay));
}
public void itemStateChanged(ItemEvent e){}
