Trying to figure out Exception Error in code

[LeeAnne Murphy]

/*
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package jp2.wk2mortcalc;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.text.DecimalFormat;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

/**
 *
 * Java Programming 2 PRG 421
 * Due August 15, 2011
 */
public class JP2Wk2mortcalc {

    /**
     * @param args the command line arguments
     */
public static void main(String[] args) {
        // TODO code application logic here
   
 
   private double principal;
   private int term;
   private double rate;
 
public class MortCalc extends JFrame implements ActionListener
{
    int term = 0;
    double principal = 0;
    double rate = 0;
    double monthlyPayment = 0;
    double interest = 0;
 
DecimalFormat twodigits = new DecimalFormat("#,###.00");
 
//***************Create JPanels and Make JLabels and JTextFields***************
JPanel row1 = new JPanel();
JLabel mortgage_label = new JLabel("Mortgage Calculator", JLabel.CENTER);
 
JPanel row2 = new JPanel(new GridLayout(1, 2));
JLabel principal_label = new JLabel("Net Amount $",JLabel.LEFT);
JTextField principal_txt = new JTextField(10);
 
JPanel row3 = new JPanel(new GridLayout(1, 2));
JLabel term_label = new JLabel("Term (Yrs)",JLabel.LEFT);
JTextField term_txt = new JTextField(10);

JPanel row4 = new JPanel(new GridLayout(1, 2));
JLabel rate_label = new JLabel("Interest Rate (%)", JLabel.LEFT);
JTextField rate_txt = new JTextField(10);
 
JPanel row5 = new JPanel(new GridLayout(1, 2));
JLabel payment_label = new JLabel("Monthly Payment $", JLabel.LEFT);
JTextField payment_txt = new JTextField(10); 
 
//***************Create JButtons and FlowLayout***************
JPanel button = new JPanel(new FlowLayout(FlowLayout.LEFT, 10, 10));
JButton clearButton = new JButton("Reset");
JButton exitButton = new JButton("Exit");
JButton calcButton = new JButton("Calculate");
JButton loan01Button = new JButton("Loan_#01");
JButton loan02Button = new JButton("Loan_#02");
JButton loan03Button = new JButton("Loan_#03");
 
//***************Create JTextArea and JScrollPane***************
JTextArea displayArea = new JTextArea(10, 45);
JScrollPane scroll = new JScrollPane(displayArea);
 
public MortCalc()
{
//************Provide a Super Class and Title for Program*************************
super("Mortgage Calculator SR-MF-003 #5");
}

//************Create JMenuBar and Populate it with Commands***************
public JMenuBar createMenuBar()
{
//***************Create JMenuBar***************
JMenuBar mnuBar = new JMenuBar();
setJMenuBar(mnuBar);
 
//***************Create JMenuBar add File***************
JMenu mnuFile = new JMenu("File", true);
mnuFile.setMnemonic(KeyEvent.VK_F);
mnuFile.setDisplayedMnemonicIndex(0);
mnuBar.add(mnuFile);
 
//***************Create JMenuBar add File & Exit***************
JMenuItem mnuFileExit = new JMenuItem("Exit");
mnuFileExit.setMnemonic(KeyEvent.VK_F);
mnuFileExit.setDisplayedMnemonicIndex(1);
mnuFile.add(mnuFileExit);
mnuFileExit.setActionCommand("Exit");
mnuFileExit.addActionListener(this);
 
//***************Create JMenuBar add Function***************
JMenu mnuFunction = new JMenu("Function", true);
mnuFunction.setMnemonic(KeyEvent.VK_F);
mnuFunction.setDisplayedMnemonicIndex(0);
mnuBar.add(mnuFunction);
	 
//***************Create JMenuBar add Function & Clear***************
JMenuItem mnuFunctionClear = new JMenuItem("Clear");
JMenuFunctionClear.setMnemonic(KeyEvent.VK_F);
mnuFunctionClear.setDisplayedMnemonicIndex(1);
mnuFunction.add(mnuFunctionClear);
mnuFunctionClear.setActionCommand("Clear");
mnuFunctionClear.addActionListener(this);
 

//***************Create JMenuBar add Function & Fill***************
JMenu mnuFunctionAutoFill = new JMenu("Auto Fill");
mnuFunctionAutoFill.setMnemonic(KeyEvent.VK_F);
mnuFunctionAutoFill.setDisplayedMnemonicIndex(2);
mnuFunction.add(mnuFunctionAutoFill);
 
//***************Create JMenuBar add Function & Fill Amount1***************

JMenuItem mnuFunctionAutoFillAmount1 = new JMenuItem("Loan_#01");
mnuFunctionAutoFillAmount1.setMnemonic(KeyEvent.VK_F);
mnuFunctionAutoFillAmount1.setDisplayedMnemonicIndex(3);
mnuFunctionAutoFill.add(mnuFunctionAutoFillAmount1);
mnuFunctionAutoFillAmount1.setActionCommand("Loan_#01");
mnuFunctionAutoFillAmount1.addActionListener(this);
 
//***************Create JMenuBar add Function & Fill Amount2***************
JMenuItem mnuFunctionAutoFillAmount2 = new JMenuItem("Loan_#02");
mnuFunctionAutoFillAmount2.setMnemonic(KeyEvent.VK_F);
mnuFunctionAutoFillAmount2.setDisplayedMnemonicIndex(4);
mnuFunctionAutoFill.add(mnuFunctionAutoFillAmount2);
mnuFunctionAutoFillAmount2.setActionCommand("Loan_#02");
mnuFunctionAutoFillAmount2.addActionListener(this);
	 
//***************Create JMenuBar add Function & Fill Amount3***************
JMenuItem mnuFunctionAutoFillAmount3 = new JMenuItem("Loan_#03");
mnuFunctionAutoFillAmount3.setMnemonic(KeyEvent.VK_F);
mnuFunctionAutoFillAmount3.setDisplayedMnemonicIndex(5);
mnuFunctionAutoFill.add(mnuFunctionAutoFillAmount3);
mnuFunctionAutoFillAmount3.setActionCommand("Loan_#03");
mnuFunctionAutoFillAmount3.addActionListener(this);
 
//***************Create JMenuBar add Function & Calculate***************
JMenuItem mnuFunctionCalculate = new JMenuItem("Calculate");
mnuFunctionCalculate.setMnemonic(KeyEvent.VK_F);
mnuFunctionCalculate.setDisplayedMnemonicIndex(6);
mnuFunction.add(mnuFunctionCalculate);
mnuFunctionCalculate.setActionCommand("Calculate");
mnuFunctionCalculate.addActionListener(this);
 
//***************Create JMenuBar add Function & Amortize Payments***************
JMenuItem mnuFunctionAmortizePayments = new JMenuItem("Amortize Payments");
mnuFunctionAmortizePayments.setMnemonic(KeyEvent.VK_F);
mnuFunctionAmortizePayments.setDisplayedMnemonicIndex(7);
mnuFunction.add(mnuFunctionAmortizePayments);
mnuFunctionAmortizePayments.setActionCommand("Amortize Payments");
mnuFunctionAmortizePayments.addActionListener(this);
	 
//***************Create JMenuBar add Info***************
JMenu mnuInfo = new JMenu("Info", true);
mnuInfo.setMnemonic(KeyEvent.VK_E);
mnuInfo.setDisplayedMnemonicIndex(0);
mnuBar.add(mnuInfo);
 //***************Create JMenuBar add Info & About***************
JMenuItem mnuInfoAbout = new JMenuItem("About");
mnuInfoAbout.setMnemonic(KeyEvent.VK_E);
mnuInfoAbout.setDisplayedMnemonicIndex(1);
mnuInfo.add(mnuInfoAbout);
mnuInfoAbout.setActionCommand("About");
mnuInfoAbout.addActionListener(this);
	 
//***************Adjust JFrame Size and Close-Operations***************
setSize(800,600);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = getContentPane();
Border rowborder = new EmptyBorder( 3, 10, 3, 10 );// Sets Border Size
	 
//***************Set Pane and Row Properties**********************
pane.add(row1);
row1.add(mortgage_label);
row1.setMaximumSize( new Dimension( 10000, row1.getMinimumSize().height));	
row1.setBorder( rowborder);
	
pane.add(row2);
row2.add(principal_label);
row2.add(principal_txt);
row2.setMaximumSize( new Dimension( 10000, row2.getMinimumSize().height));
row2.setBorder( rowborder);
 
pane.add(row3);
row3.add(term_label);
row3.add(term_txt);
row3.setMaximumSize( new Dimension( 10000, row3.getMinimumSize().height));
row3.setBorder( rowborder);
	 
pane.add(row4);
row4.add(rate_label);
row4.add(rate_txt);
row4.setMaximumSize( new Dimension( 10000, row4.getMinimumSize().height));
row4.setBorder( rowborder);
	 
pane.add(row5);
row5.add(payment_label);
row5.add(payment_txt);
payment_txt.setEnabled(false);
row5.setMaximumSize( new Dimension( 10000, row5.getMinimumSize().height));
row5.setBorder( rowborder);
  
button.add(calcButton);
button.add(clearButton);
button.add(exitButton);
pane.add(button);
button.setMaximumSize( new Dimension( 10000, button.getMinimumSize().height));
	 
	scroll.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
	pane.add(scroll);
	 
        pane.setLayout(new BoxLayout( pane, BoxLayout.Y_AXIS));
setVisible(true);
setContentPane(pane);
 
//***************Add Listeners***************
clearButton.addActionListener(this);
exitButton.addActionListener(this);
calcButton.addActionListener(this);
loan01Button.addActionListener(this);
loan02Button.addActionListener(this);
loan03Button.addActionListener(this);
 
return mnuBar;// End JMenuBar Creation
}

//***************Create commands for JMenuBar**************************
        @Override
public void actionPerformed(ActionEvent event)
{
 Object source = event.getSource();
 
//Begin "if" function
 if (source == calcButton) // calculates on hit
 {
  validateUserInput(principal_txt, rate_txt, term_txt); // validates input

        //formula for calculation output
  monthlyPayment = principal * (rate / (12 * 100)) / (1 - Math.pow(1 + (rate / (12 * 100)), -1 * (term * 12)));
  payment_txt.setText("" + twodigits.format(monthlyPayment));
 }
 
 if (source == clearButton) // Clears on hit
 {
 term_txt.setText("  ");
 rate_txt.setText("  ");
 principal_txt.setText("   ");
 payment_txt.setText("   ");
 displayArea.setText("   ");
 }
 
  if (source == exitButton) // Exits on hit
  {
	 
  System.exit(0);
  }
	 
}

//end action

    }
    //Declaration of user input for each variable
 
    public void validateUserInput(JTextField principal_txt, JTextField rate_txt, JTextField term_txt)
    {
        
        //Begin "try/catch" function
     try 
     {
  principal = Double.parseDouble(principal_txt.getText());
 
     }catch (NumberFormatException e)//Action listener
     {

         //Function to validate if input is from user is numeric and if not output error message
         
         JOptionPane.showMessageDialog(null, "Enter Numeric Value Only for Net!", "INVALD ENTRY", 
                 JOptionPane.ERROR_MESSAGE);
      }
 try {
	 
     term = Integer.parseInt(term_txt.getText());
	} catch (NumberFormatException e) {
	 
            
   JOptionPane.showMessageDialog(null, "Enter Numeric Value Only for Term!", "INVALD ENTRY", 
           JOptionPane.ERROR_MESSAGE);
        }
 
        try {
 
rate = Double.parseDouble(rate_txt.getText());
        } catch (NumberFormatException e) {
 
            JOptionPane.showMessageDialog(null, "Enter Numeric Value Only for Rate!", "INVALD ENTRY",
                    JOptionPane.ERROR_MESSAGE);
   }
    }

}// End of Class  

Here is the error :

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - illegal start of expression
at jp2.wk2mortcalc.JP2Wk2mortcalc.main(JP2Wk2mortcalc.java:46)

[Angus Comber]

The error is telling you exactly where to look - line 46.

private double principal;

I will give you a clue, you are declaring this in main, ie not a class.

[Manuel Petermann]

Please use code tags. This is impossible to read!
I suggest you look on basic Java tutorials first too.
You try to learn running before you are able to walk here I guess...

[fred rosenberger]

I put code tags around your java, making it much easier to read. Please use them in the future - it's just like making something bold or italicized - highlight what you want, then click the button labled "code" and you'll see them pop in.


Now that the code is formatted in such a way that I can read it...you'll notice several strange things. Your main() method starts on line 42, but before it ends you start a new method...

basically, you seem to have a lot of formatting errors. I don't know how you got this far without finding the problem. You should NEVER write more than 2-3 lines of code before you re-compile. writing 300+ before you do your first compile is guaranteed to cause you nothing but grief and pain.

[Wouter Oet]

Also I see that it is a RuntimeException. Normally this would be a compile time exception. I'm going to assume that you even though your ide complained that there where errors in your code you ran it anyway. Don't do that. Always fix compile-time errors before running.

Edit: And welcome to the JavaRanch!

[LeeAnne Murphy]

Ok I moved those 3 lines but now I get the exception error on line 53.

Here is the line. I am not understanding the exception error and what it means or what I need to make it go away.

public class MortCalc extends JFrame implements ActionListener

Same from the code I posted earlier.

[Paul Clapham]

It's like Fred said: you've got too much code. Hacking out random bits isn't going to get you anywhere, unless you get lucky. So what I would recommend is this:

Start over. No, I don't mean throw out what you have. Just start over with a new class and build it up a bit at a time. The bits are going to come from what you already have, just extract small bits and put them into the new code carefully. And like Fred said, keep compiling as you rebuild your code.

[Campbell Ritchie]

I am a bit surprised Fred didn't say, as he often does, to start with code like this

public class JP2Wk2mortcalc {

    /**
     * @param args the command line arguments
     */
public static void main(String[] args) {
        System.out.println("MortCalc class");
    }

}// End of Class  

Now you can see that the class is compiling, and then you can add some real code. As Campbell Ritchie often says, write 5 lines, compile and run, then add another 5 lines. If you do it like that you can see the thing working and find errors so much more easily.