Lottory2.0

package Semester1;
/*
     Program: GUImortgage.Java
     Programmer: Yonatan Mishan
     Date: 10-22-18
     version: 5.0
     This program uses a GUI to take a user-input term rate and principal and
     calculate monthly payment. in addition it print your Interest Paid, Princ Paid, and  principal in a table.
     */
    //imports
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.text.DecimalFormat;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    import java.awt.event.ItemEvent;
    import java.awt.event.ItemListener;


public class GUImortgage6 extends JFrame implements ActionListener {
        // creating the labels and buttons
        FlowLayout flow = new FlowLayout();
        JFrame frame = new JFrame("Menu");
        //creating the labels and menu bar

        JMenuBar jmb = new JMenuBar();
        JMenu menu = new JMenu("Menu");
        JMenuItem m7 = new JMenuItem("7 year at 5.35%");
        JMenuItem m15 = new JMenuItem("15 year at 5.50%");
        JMenuItem m30 = new JMenuItem("30 year at 5.75%");

        JLabel labelPrincipal = new JLabel("Principal: ");
        JTextField textPrincipal = new JTextField(5);
        JLabel space1 = new JLabel("                     ");

        JLabel labelRate = new JLabel("Rate: ");
        JTextField textRate = new JTextField(5);
        JLabel space2 = new JLabel("                     ");

        JLabel labelTerm = new JLabel("Enter your term: ");
        JTextField textTerm = new JTextField(5);
        JLabel space3 = new JLabel("                     ");

        JMenu action = new JMenu("Actions");
        JMenuItem Calculate = new JMenuItem("Calculate!");
        JMenuItem Reset = new JMenuItem("Reset");
        JMenuItem Exit = new JMenuItem("Exit");

        JLabel MonthlyPaymentLabel = new JLabel("Your monthly payment is: ");
        JTextArea Payment = new JTextArea("");

        String text = "";

        public GUImortgage6() { // constructor
            super("Mortgage Calculator");
            Container con = getContentPane();
            con.setLayout(flow);
            frame.setJMenuBar(jmb);
            con.add(jmb);
            jmb.add(menu);
            jmb.add(action);
            con.add(labelPrincipal);
            con.add(textPrincipal);
            con.add(space1);
            con.add(labelRate);
            con.add(textRate);
            con.add(space2);
            con.add(labelTerm);
            con.add(textTerm);
            con.add(space3);
            con.add(MonthlyPaymentLabel);
            con.add(Payment);
            con.add(Calculate);
            con.add(Reset);
            con.add(Exit);
            menu.add(m7);
            menu.add(m15);
            menu.add(m30);
            action.add(Calculate);
            action.add(Reset);
            action.add(Exit);
            //adding action listeners.
            m7.addActionListener(this);
            m15.addActionListener(this);
            m30.addActionListener(this);
            Calculate.addActionListener(this);
            Reset.addActionListener(this);
            Exit.addActionListener(this);
        }// end constructor

        public static void main(String[] args) {// main method
            GUImortgage6 temp = new GUImortgage6();
            temp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// close on x
            temp.setSize(1000, 600);// frame size
            temp.setVisible(true);// make GUI visible
        }// end main

        public void actionPerformed(ActionEvent e) {
            String source = e.getActionCommand();
            //setting Calculate button and calculating monthly payment from the user inputs
            if(source == "7 year at 5.35%") {
                textRate.setText("7");
                textTerm.setText("5.35");
            }else if(source == "15 year at 5.50%") {
                textRate.setText("15");
                textTerm.setText("5.50");
            }else if(source == "30 year at 5.75%") {
                textRate.setText("30");
                textTerm.setText("5.75");
            }else if (source == "Calculate!") {
                String Principal = textPrincipal.getText();
                String Rate = textRate.getText();
                String Term = textTerm.getText();
                double p = Double.parseDouble(Principal);
                double r = Double.parseDouble(Rate);
                double t = Double.parseDouble(Term);
                double MonthlyPayment = 0;
                try {
                if (t >= 10 && t <=40){
                    t = t * 12;
                    r = r / 1200.0;
                    MonthlyPayment = p * r / (1.0 - Math.pow(r + 1, -t)); // calculating the principal.
                }else {
                    throw new termException("TERM IS OUT OF BOUNDS! ");
                    }
                } catch(termException e1) {
                        text += String.format(e1.getMessage());
                    }

                for (int i=1;i<=360;i++){ //start loop for the number of payments

                    double interest_paid = p * r;
                    double princPaid =  MonthlyPayment - interest_paid;
                    p =  p - princPaid;
                    //add info to string
                    text += String.format("Month " + i + " " + "MonthlyPayment: $%.2f Interest Paid: $%.2f Princ Paid: $%.2f principal: $%.2f\n ",
                            MonthlyPayment, interest_paid, princPaid, p);
                }
                    Payment.setText(text); //print string

            } else if (source == "Reset") { //reseting all the text
                textRate.setText("");
                textPrincipal.setText("");
                textTerm.setText("");
                Payment.setText("");
            } else { //exiting the program
                System.exit(0);
            }//end else
        }//end actionPerformed

    }//end class