Thread: mortcal

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.border.Border;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.text.*;
 
public class newMortgageCalculator1 extends JFrame
                                    implements PropertyChangeListener, ActionListener {
 
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	public class String {
 
	}
	private static final Object[] String = null;
	//*input for each field
    private double amount = 200000;
    private double rate = .0575;  //5.75%
    private int numPeriods = 30; 
 
    //*Lets you know what the fields are
    private JLabel amountLabel;
    private JLabel rateLabel;
    private JLabel numPeriodsLabel;
    private JLabel paymentLabel;
 
    //*Strings for each input
    private static java.lang.String amountString = "Loan Amount: ";
    private static java.lang.String rateString = "APR (%): ";
    private static java.lang.String numPeriodsString = "Years: ";
    private static java.lang.String paymentString = "Monthly Payment: ";
 
	private static newMortgageCalculator1 newMortgageCalculator;
 
    //*input fields
    private JFormattedTextField amountField;
    private JFormattedTextField rateField;
    private JFormattedTextField numPeriodsField;
    private JFormattedTextField paymentField;
 
    //*Formats for the calculation
    private NumberFormat amountFormat;
    private NumberFormat percentFormat;
    private NumberFormat paymentFormat;
 
	//*Adds buttons to the field
	public JButton CalculateButton;
	public JButton ClearButton;
	public JButton ExitButton;
	private Container content;
	public JLabel temp;
 
 
 
	public newMortgageCalculator1() {
        super();
        setSize(500, 400);
        setUpFormats();
 
        double payment = calculatePayment(amount, rate, numPeriods);
        add(CalculateButton);
        add(ClearButton);
        add(ExitButton);
        CalculateButton = new JButton("Calculate");
        ClearButton = new JButton("Clear");
        ExitButton = new JButton("Exit");
        CalculateButton.addActionListener(this);
        ClearButton.addActionListener(this);
        ExitButton.addActionListener(this);
 
 
        //*Makes the labels.
        amountLabel = new JLabel(amountString);
        rateLabel = new JLabel(rateString);
        numPeriodsLabel = new JLabel(numPeriodsString);
        paymentLabel = new JLabel(paymentString);
 
        //*Makes text fields.
        amountField = new JFormattedTextField(amountFormat);
        amountField.setValue(new Double(amount));
        amountField.setColumns(10);
        amountField.addPropertyChangeListener("value", (PropertyChangeListener) this);
 
        rateField = new JFormattedTextField(percentFormat);
        rateField.setValue(new Double(rate));
        rateField.setColumns(10);
        rateField.addPropertyChangeListener("value", this);
 
        numPeriodsField = new JFormattedTextField();
        numPeriodsField.setValue(new Integer(numPeriods));
        numPeriodsField.setColumns(10);
        numPeriodsField.addPropertyChangeListener("value", this);
 
        paymentField = new JFormattedTextField(paymentFormat);
        paymentField.setValue(new Double(payment));
        paymentField.setColumns(10);
        paymentField.setEditable(false);
        paymentField.setForeground(Color.red);
 
        //*Information on the labels
        amountLabel.setLabelFor(amountField);
        rateLabel.setLabelFor(rateField);
        numPeriodsLabel.setLabelFor(numPeriodsField);
        paymentLabel.setLabelFor(paymentField);
 
        //*arranges labels in the panel.
        JPanel labelPane = new JPanel(new GridLayout(0,1));
        labelPane.add(amountLabel);
        labelPane.add(rateLabel);
        labelPane.add(numPeriodsLabel);
        labelPane.add(paymentLabel);
 
        //*arranges the text labels in the panel .
        JPanel fieldPane = new JPanel(new GridLayout(0,1));
        fieldPane.add(amountField);
        fieldPane.add(rateField);
        fieldPane.add(numPeriodsField);
        fieldPane.add(paymentField);
 
        //*Put the labels on left.
        //*text fields on right.
        setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
        add(labelPane, BorderLayout.CENTER);
        add(fieldPane, BorderLayout.LINE_END);
 
 
		//* places content in frame.
        content.add(CalculateButton);
        content.add(ClearButton);
        content.add(ExitButton);
 
       //* controls the calculation button actions
        CalculateHandler handlerC = new CalculateHandler();
        CalculateButton.addActionListener((ActionListener) handlerC);
 
        //*controls the clear button actions
        ClearHandler  handlerD = new ClearHandler();
        ClearButton.addActionListener((ActionListener) handlerD);
 
 
    }
		private double calculatePayment(double amount2, double rate2,
			int numPeriods2) {
		// TODO Auto-generated method stub
		return 0;
	}
		private void add(JPanel labelPane, java.lang.String center) {
		// TODO Auto-generated method stub
 
	}
		private void setUpFormats() {
		// TODO Auto-generated method stub
 
	}
		private void setBorder(Border createEmptyBorder) {
		// TODO Auto-generated method stub
 
	}
		private void add(JButton calculate2) {
		// TODO Auto-generated method stub
 
	}
 
	//*Makes button perform
	public void actionPerformed(ActionEvent e){
		if (e.getSource() == CalculateButton){
			}
		else if (e.getSource() == ClearButton){
			}
		else if (e.getSource() == ExitButton){
			System.exit(0);
		}
	}
    /** Used when a field's "value" property changes. */
    public void propertyChange(PropertyChangeEvent e) {
        Object source = e.getSource();
        if (source == amountField) {
            amount = ((Number)amountField.getValue()).doubleValue();
        } else if (source == rateField) {
            rate = ((Number)rateField.getValue()).doubleValue();
        } else if (source == numPeriodsField) {
            numPeriods = ((Number)numPeriodsField.getValue()).intValue();
        }
 
 
        intValue();} private void intValue() {
		// TODO Auto-generated method stub
 
	}
 
 
    int args() {
		return 0;
	} 
	newMortgageCalculator1 (String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
 
            }});
        }
 
 
 
	//*Calculates the monthly payment based on the loan amount,
    //*Interest rate, and length of loan.
    public static double calculatePayment1(double principle, double annRate, int years){
    	double monthlyInt = annRate / 12;
    	double monthlyPayment = (principle * monthlyInt)
    	          / (1 - Math.pow(1/ (1 + monthlyInt), years * 12)); //*Calculates 1 monthly payment times by 12 for yearly cost. 
    	return format(monthlyPayment, 2);
    	}
 
 
 
 
    	public static double format(double amount, int mortgage) {
    	double temp = amount; 
    	temp = temp * Math.pow(10, mortgage);
    	temp = Math.round(temp);
    	temp = temp/Math.pow(10, mortgage);
    	return temp;
    	}
 
 
    	@SuppressWarnings("unused")
		private void newMortgageCalculator11(){
        amountFormat = NumberFormat.getNumberInstance();
        percentFormat = NumberFormat.getNumberInstance();
        percentFormat.setMinimumFractionDigits(3);
        paymentFormat = NumberFormat.getCurrencyInstance();
 
    	}
 
        public void mortcal(String[] args){
	 		newMortgageCalculator = new newMortgageCalculator1();
	 		newMortgageCalculator.setVisible1(true);
    }
		private void setVisible1(boolean b) {
			// TODO Auto-generated method stub
 
		}
 
 
	public void setVisible(boolean b) {
		// TODO Auto-generated method stub
 
	}
	public static Object[] getString() {
		return String;
	}
    }

And if you have a question, please ask it, and be detailed.

I get is an error message

Please copy and paste the full text of the error message here.

The code does not compile because of missing class definitions.

You need to find the definitions for the missing classes and add them to your code.

Or you need to create classes for those that are not defined.

Thanks I Find that missing class and added that class to it now I am having different errors here is the new coding:

import java.awt.*;
import java.awt.event.ActionListener;
 
import javax.swing.*;
 
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
 
import java.text.*;
import java.util.logging.ConsoleHandler;
 
public class MortgageCalculator{
 
 
 
public static Container container;
 
public static class week2MortCal extends JPanel
                                    implements PropertyChangeListener {
 
	private static final long serialVersionUID = 1L;
	//*input for each field
    private double amount = 200000;
    private double rate = .0575;  //5.75%
    private int numPeriods = 30; 
 
    //*Lets you know what the fields are
    private JLabel amountLabel;
    private JLabel rateLabel;
    private JLabel numPeriodsLabel;
    private JLabel paymentLabel;
 
    //*Strings for each input
    private static String amountString = "Loan Amount: ";
    private static String rateString = "APR (%): ";
    private static String numPeriodsString = "Years: ";
    private static String paymentString = "Monthly Payment: ";
 
    //*input fields
    private JFormattedTextField amountField;
    private JFormattedTextField rateField;
    private JFormattedTextField numPeriodsField;
    private JFormattedTextField paymentField;
 
    //*Formats for the calculation
    private NumberFormat amountFormat;
    private NumberFormat percentFormat;
    private NumberFormat paymentFormat;
	private double temp1;
 
	//*Adds buttons to the field
		public static JButton CalculateButton;
		public static JButton ClearButton;
		public static JButton ExitButton;
		private Container content;
		public JLabel temp;
		public week2MortCal() {
        super(new BorderLayout());
        setUpFormats();
        double payment = calculatePayment(amount, rate, numPeriods);
 
 
        //*Makes the labels.
        amountLabel = new JLabel(amountString);
        rateLabel = new JLabel(rateString);
        numPeriodsLabel = new JLabel(numPeriodsString);
        paymentLabel = new JLabel(paymentString);
 
        //*Makes text fields.
        amountField = new JFormattedTextField(amountFormat);
        amountField.setValue(new Double(amount));
        amountField.setColumns(10);
        amountField.addPropertyChangeListener("value", this);
 
        rateField = new JFormattedTextField(percentFormat);
        rateField.setValue(new Double(rate));
        rateField.setColumns(10);
        rateField.addPropertyChangeListener("value", this);
 
        numPeriodsField = new JFormattedTextField();
        numPeriodsField.setValue(new Integer(numPeriods));
        numPeriodsField.setColumns(10);
        numPeriodsField.addPropertyChangeListener("value", this);
 
        paymentField = new JFormattedTextField(paymentFormat);
        paymentField.setValue(new Double(payment));
        paymentField.setColumns(10);
        paymentField.setEditable(false);
        paymentField.setForeground(Color.blue);
 
        //*Information on the labels
        amountLabel.setLabelFor(amountField);
        rateLabel.setLabelFor(rateField);
        numPeriodsLabel.setLabelFor(numPeriodsField);
        paymentLabel.setLabelFor(paymentField);
 
        //*arranges labels in the panel.
        JPanel labelPane = new JPanel(new GridLayout(0,1));
        labelPane.add(amountLabel);
        labelPane.add(rateLabel);
        labelPane.add(numPeriodsLabel);
        labelPane.add(paymentLabel);
 
        //*arranges the text labels in the panel .
        JPanel fieldPane = new JPanel(new GridLayout(0,1));
        fieldPane.add(amountField);
        fieldPane.add(rateField);
        fieldPane.add(numPeriodsField);
        fieldPane.add(paymentField);
 
        //*Put the labels on left,
        //*text fields on right.
        setBorder(BorderFactory.createEmptyBorder(30, 30, 30, 30));
        add(labelPane, BorderLayout.CENTER);
        add(fieldPane, BorderLayout.LINE_END); 
 
      //* places content in frame.
        content.add(CalculateButton);
        content.add(ClearButton);
        content.add(ExitButton);
 
        //* controls the calculation button actions
        ConsoleHandler handlerC = new ConsoleHandler();
        CalculateButton.addActionListener((ActionListener) handlerC);
 
        //*controls the clear button actions
        ClearHandler  handlerD = new ClearHandler();
        ClearButton.addActionListener((ActionListener) handlerD);
    }
 
 
    /** Used when a field's "value" property changes. */
    public void propertyChange(PropertyChangeEvent e) {
        Object source = e.getSource();
        if (source == amountField) {
            amount = ((Number)amountField.getValue()).doubleValue();
        } else if (source == rateField) {
            rate = ((Number)rateField.getValue()).doubleValue();
        } else if (source == numPeriodsField) {
            numPeriods = ((Number)numPeriodsField.getValue()).intValue();
        }
 
        double payment = calculatePayment(amount, rate, numPeriods);
        paymentField.setValue(new Double(payment));
    }
 
 
    private static void createAndShowGUI() {
        //*Makes the window.
        JFrame frame = new JFrame("Mortgage Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        //*Allows you to add input in window
        frame.add(new week2MortCal());
        CalculateButton = new JButton("Calculate");
        ClearButton = new JButton("Clear");
        ExitButton = new JButton("Exit");
        CalculateButton.addActionListener(null);
        ClearButton.addActionListener(null);
        ExitButton.addActionListener(null);
        //*Shows the window
        frame.pack();
        frame.setVisible(true);
    }
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
 
	        UIManager.put("swing.boldMetal", Boolean.FALSE);
                createAndShowGUI();
            }
        });
    }
 
    //*Calculates the monthly payment based on the loan amount,
    //*Interest rate, and length of loan.
    public static double calculatePayment(double principle, double annRate, int years){
    	double monthlyInt = annRate / 12;
    	double monthlyPayment = (principle * monthlyInt)
    	          / (1 - Math.pow(1/ (1 + monthlyInt), years * 12)); //*Calculates 1 monthly payment times by 12 for yearly cost. 
    	return format(monthlyPayment, 2);
    	}
    	public static double format(double amount, int mortgage) {
    	double temp = amount; 
    	temp = temp * Math.pow(10, mortgage);
    	temp = Math.round(temp);
    	temp = temp/Math.pow(10, mortgage);
    	return temp;
    	}
 
 
    private void setUpFormats() {
        amountFormat = NumberFormat.getNumberInstance();
 
        percentFormat = NumberFormat.getNumberInstance();
        percentFormat.setMinimumFractionDigits(3);
 
        paymentFormat = NumberFormat.getCurrencyInstance();
    }
 
	public double getTemp() {
		return temp1;
	}
 
	public void setTemp(double temp) {
		this.temp1 = temp;
		}
	}
};

These are the error messages that I am getting:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at MortgageCalculator$week2MortCal.<init>(MortgageCal culator.java:118)
at MortgageCalculator$week2MortCal.createAndShowGUI(M ortgageCalculator.java:154)
at MortgageCalculator$week2MortCal.access$0(MortgageC alculator.java:148)
at MortgageCalculator$week2MortCal$1.run(MortgageCalc ulator.java:171)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

The main() method is spelled this way: main
It is a method.
You need to consider the difference between method and classes. The following line defines a class:
public class MortgageCalculator ....

How do I consider the difference between method and class? Sorry I am so confused and you have been so kind to help me thank you so much for all this help.