0

Hello Daniweb,

I have a program due this evening and am ready to give up. I can't figure out my compile problems:

C:\Users\Chris\Desktop\My Java Programs\Chris_Y_Week_5_IA.java:85: call to super must be first statement in constructor
super("mortgagecalcsr7");
     ^
C:\Users\Chris\Desktop\My Java Programs\Chris_Y_Week_5_IA.java:573: inner classes cannot have static declarations
public static void main(String[] args)
                   ^
2 errors

Tool completed with exit code 1

which came from the following code:

import java.awt.*;

import java.text.NumberFormat;

import javax.swing.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.Graphics;

import java.awt.geom.Rectangle2D;





 public class Chris_Y_Week_5_IA extends JFrame implements ActionListener

 {

     // Declare Labels

     JLabel AmountLabel = new JLabel( "Principal Amount:$ " );

     JLabel PaymentLabel = new JLabel( "Monthly Payment: " );

     JLabel InterestLabel = new JLabel( "Interest Rate %: " );

     JLabel TermLabel = new JLabel( "Length of Loan of Loan in Years: " );



     // Declare Text Fields

     JTextField mortgageAmount = new JTextField(7);

     JTextField Payment = new JTextField(7);

     JTextField InterestRate = new JTextField(3);

     JTextField Term = new JTextField(3);





     // Declare Buttons

     JButton Loan7 = new JButton( "7 years at 5.35%" );

     JButton Loan15 = new JButton( "15 years at 5.50%" );

     JButton Loan30 = new JButton( "30 years at 5.75%" );

     JButton ExitButton = new JButton( "Exit" );

     JButton ClearButton = new JButton( "Clear All" );

     JButton CalculateButton = new JButton( "Calculate Loan" );





     // Declares Text Area and ScrollPane

     JTextArea LoanPayments = new JTextArea(20,50);

     JTextArea GraphArea = new JTextArea(19,50);

     JScrollPane scroll = new JScrollPane(LoanPayments);







     {

         //Frame, Panel, and Layout set up

super("mortgagecalcsr7");

         setSize(900, 800);

         setLocation(200, 0);

         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         JPanel pane = new JPanel(new GridLayout(3,1));



         //Setup container and contents

         Container grid = getContentPane();

         grid.setLayout(new GridLayout(4,0,4,4));



        pane.add(grid);

         pane.add(scroll);

         grid.add(AmountLabel);

         grid.add(mortgageAmount);

        grid.add(InterestLabel);

         grid.add(InterestRate);

         grid.add(TermLabel);

         grid.add(Term);

         grid.add(PaymentLabel);

         grid.add(Payment);

         grid.add(Loan7);

         grid.add(Loan15);

         grid.add(Loan30);

         grid.add(CalculateButton);

         grid.add(ClearButton);

         grid.add(ExitButton);

         Payment.setEditable(false);

         setContentPane(pane);

         setContentPane(pane);

         setVisible(true);



        //Adds Action Listeners

         ExitButton.addActionListener(this);

         ClearButton.addActionListener(this);

         Loan7.addActionListener(this);

         Loan15.addActionListener(this);

         Loan30.addActionListener(this);

         mortgageAmount.addActionListener(this);

         InterestRate.addActionListener(this);

         Term.addActionListener(this);

         Payment.addActionListener(this);

         CalculateButton.addActionListener(this);





     }



     public void actionPerformed(ActionEvent e) {

        Object command = e.getSource();

         if (command == ExitButton) {

             System.exit(0);  }

         else if (command == Loan7) {

             calcLoan(7, 5.35);   }

         else if (command == Loan15) {

             calcLoan(15, 5.50);  }

         else if (command == Loan30) {

             calcLoan(30, 5.75);  }

         else if (command == CalculateButton ) {

             double terms = 0;

             double rates = 0;

             try {

                 terms = Double.parseDouble(Term.getText());

                 rates = Double.parseDouble(InterestRate.getText());

             } catch (Exception ex) {

                 LoanPayments.setText("Invalid term or rate Amount");

                 return;



             }



             calcLoan(terms, rates);  }

         else if (command == ClearButton) {

             mortgageAmount.setText("");

             Payment.setText("");

             InterestRate.setText("");

             Term.setText("");

             LoanPayments.setText("");



         }



     }



     private void calcLoan(double terms, double rates) {

         Term.setText(String.valueOf(terms) );

         InterestRate.setText(String.valueOf(rates));

         double amount = 0;

         try {

             amount = Double.parseDouble(mortgageAmount.getText());

             //Parse text to

         }    catch (Exception ex) {       LoanPayments.setText

             ("Invalid mortgage Amount");

         return;  }

         double interestRate = rates;



         // Sets interestRate amount

         double intRate = (interestRate / 100) / 12;



         // Calculates Interest Rate

         // double loanTermMonths = terms;

         // Calculates Loan Term in Months

         int months = (int)terms * 12;



         // Converts Loan Term to Months

         double rate = (intRate / 12);



         // Converts Annual interest rate to monthly interest rate

         double payment = amount * intRate / (1 - (Math.pow(1/(1 + intRate), months)));



         // Calculation for Monthly payment

        double remainingPrincipal = amount;



         // Sets Remaining Balance

         double MonthlyInterest = 0;





         // saves interest payment

         double MonthlyAmt = 0;



         // saves principal payment

         //double x[] = new double[1]; x[0] = 0;

         // Number formatter to format output in table

         NumberFormat CurrencyFormatter = NumberFormat.getCurrencyInstance();

        Payment.setText(CurrencyFormatter.format(payment));

         LoanPayments.setText("Month\tPrincipal\tInterest\tEnding Balance\n");



         // double[] values = new double[months];

         // counting the month backward is confusing

         // for(;months > 0; months -- ) {

         int currentMonth = 0;    while(currentMonth < months) {



             //Append loop for mortgage detail in the text area

             MonthlyInterest = (remainingPrincipal * intRate);



             //Monthly Payment Toward Interest

             MonthlyAmt = (payment - MonthlyInterest);



             //Monthly Payment Toward Principal

             remainingPrincipal = (remainingPrincipal - MonthlyAmt);



             //Remaining loan Balance

             // values[months-1] = remainingPrincipal;

             LoanPayments.append((++currentMonth) + "\t" +

                     CurrencyFormatter.format(MonthlyAmt) + "\t" +

                    CurrencyFormatter.format(MonthlyInterest) + "\t" +

                     CurrencyFormatter.format(remainingPrincipal) + "\n");









             GraphArea.append("" + remainingPrincipal);

         }

     }



     public class GraphProgram extends JPanel



    {

         GraphCanvas graph = new GraphCanvas();



         public GraphProgram()

         {

            setLayout(new BorderLayout());

             setSize(300, 300);



            add(graph, BorderLayout.CENTER);

        }



        public void setValues(double[] values) {

            graph.setValues(values);

        }

        public class CoordCanvas extends Canvas

         {

             protected float viewLeft;

             protected float viewRight;

             protected float viewTop;

             protected float viewBottom;



             public void setXRange(float left, float right)

             {

                 viewLeft = left;

                 viewRight = right;

             }



             public void setYRange(float top, float bottom)

             {

                 viewTop = top;

                 viewBottom = bottom;

             }



             public float toX(float x)

            {

                 return (x - viewLeft) * getSize().width / (viewRight - viewLeft);

             }



             public float toY(float y)

             {

                 return (y - viewTop) * getSize().height / (viewBottom - viewTop);

             }



             public float toWidth(float w)

             {

                 return w * getSize().width / Math.abs(viewRight - viewLeft);

             }



             public float toHeight(float h)

             {

                 return h * getSize().height / Math.abs(viewBottom - viewTop);

             }

         }





         //  subclass to draw a bar graph



         class GraphCanvas extends CoordCanvas

         {

             private double[] vals = null;



            public  void setValues(double[] vals)

            {

                 this.vals = vals;

               repaint();

            }



            public void paint(Graphics comp)

           {

               if (vals == null || vals.length < 1)

                    return;



                 // find maximum value

                 double max = vals[0];

                 for (int i = 0; i < vals.length; i++)

                    if (vals[i] > max)

                        max = vals[i];



// set coordinate ranges

this.setXRange(0F, (float)vals.length);

this.setYRange((float)max, 0F);



// draw the graph

Graphics2D comp2D = (Graphics2D)comp;

for (int i = 0; i < vals.length; i++)

{

Rectangle2D.Float remainingPrincipal = new Rectangle2D.Float(toX((float)i),

toY((float)vals[i]), toWidth(1F), toHeight((float)vals[i]));

comp2D.fill(remainingPrincipal);

}

}

public static void main(String[] args)

{

Chris_Y_Week_5_IA frame= new Chris_Y_Week_5_IA();



}

}

}

}

Edited by Nick Evan: Fixed formatting

2
Contributors
3
Replies
4
Views
7 Years
Discussion Span
Last Post by Szeth
0

Use code tags please. It makes your code easier to read.

Your first error is that your constructor, the super() call must be the first line.
The second error is that you have a class inside another class -an inner class- and you have a static variable inside that. You can't do that.

Edited by happygeek: fixed formatting

0

I kinda got that from reading about those errors online, but I'm having problems fixing it because I'm not sure where to put the super line and the class inside the class. My mind is mush at this point, been working on this for a week.

0
import java.awt.*;

import java.text.NumberFormat;

import javax.swing.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.Graphics;

import java.awt.geom.Rectangle2D;





 public class Chris_Y_Week_5_IA extends JFrame implements ActionListener

 {

     // Declare Labels

     JLabel AmountLabel = new JLabel( "Principal Amount:$ " );

     JLabel PaymentLabel = new JLabel( "Monthly Payment: " );

     JLabel InterestLabel = new JLabel( "Interest Rate %: " );

     JLabel TermLabel = new JLabel( "Length of Loan of Loan in Years: " );



     // Declare Text Fields

     JTextField mortgageAmount = new JTextField(7);

     JTextField Payment = new JTextField(7);

     JTextField InterestRate = new JTextField(3);

     JTextField Term = new JTextField(3);





     // Declare Buttons

     JButton Loan7 = new JButton( "7 years at 5.35%" );

     JButton Loan15 = new JButton( "15 years at 5.50%" );

     JButton Loan30 = new JButton( "30 years at 5.75%" );

     JButton ExitButton = new JButton( "Exit" );

     JButton ClearButton = new JButton( "Clear All" );

     JButton CalculateButton = new JButton( "Calculate Loan" );





     // Declares Text Area and ScrollPane

     JTextArea LoanPayments = new JTextArea(20,50);

     JTextArea GraphArea = new JTextArea(19,50);

     JScrollPane scroll = new JScrollPane(LoanPayments);







     {

         //Frame, Panel, and Layout set up

super("mortgagecalcsr7");

         setSize(900, 800);

         setLocation(200, 0);

         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         JPanel pane = new JPanel(new GridLayout(3,1));



         //Setup container and contents

         Container grid = getContentPane();

         grid.setLayout(new GridLayout(4,0,4,4));



        pane.add(grid);

         pane.add(scroll);

         grid.add(AmountLabel);

         grid.add(mortgageAmount);

        grid.add(InterestLabel);

         grid.add(InterestRate);

         grid.add(TermLabel);

         grid.add(Term);

         grid.add(PaymentLabel);

         grid.add(Payment);

         grid.add(Loan7);

         grid.add(Loan15);

         grid.add(Loan30);

         grid.add(CalculateButton);

         grid.add(ClearButton);

         grid.add(ExitButton);

         Payment.setEditable(false);

         setContentPane(pane);

         setContentPane(pane);

         setVisible(true);



        //Adds Action Listeners

         ExitButton.addActionListener(this);

         ClearButton.addActionListener(this);

         Loan7.addActionListener(this);

         Loan15.addActionListener(this);

         Loan30.addActionListener(this);

         mortgageAmount.addActionListener(this);

         InterestRate.addActionListener(this);

         Term.addActionListener(this);

         Payment.addActionListener(this);

         CalculateButton.addActionListener(this);





     }



     public void actionPerformed(ActionEvent e) {

        Object command = e.getSource();

         if (command == ExitButton) {

             System.exit(0);  }

         else if (command == Loan7) {

             calcLoan(7, 5.35);   }

         else if (command == Loan15) {

             calcLoan(15, 5.50);  }

         else if (command == Loan30) {

             calcLoan(30, 5.75);  }

         else if (command == CalculateButton ) {

             double terms = 0;

             double rates = 0;

             try {

                 terms = Double.parseDouble(Term.getText());

                 rates = Double.parseDouble(InterestRate.getText());

             } catch (Exception ex) {

                 LoanPayments.setText("Invalid term or rate Amount");

                 return;



             }



             calcLoan(terms, rates);  }

         else if (command == ClearButton) {

             mortgageAmount.setText("");

             Payment.setText("");

             InterestRate.setText("");

             Term.setText("");

             LoanPayments.setText("");



         }



     }



     private void calcLoan(double terms, double rates) {

         Term.setText(String.valueOf(terms) );

         InterestRate.setText(String.valueOf(rates));

         double amount = 0;

         try {

             amount = Double.parseDouble(mortgageAmount.getText());

             //Parse text to

         }    catch (Exception ex) {       LoanPayments.setText

             ("Invalid mortgage Amount");

         return;  }

         double interestRate = rates;



         // Sets interestRate amount

         double intRate = (interestRate / 100) / 12;



         // Calculates Interest Rate

         // double loanTermMonths = terms;

         // Calculates Loan Term in Months

         int months = (int)terms * 12;



         // Converts Loan Term to Months

         double rate = (intRate / 12);



         // Converts Annual interest rate to monthly interest rate

         double payment = amount * intRate / (1 - (Math.pow(1/(1 + intRate), months)));



         // Calculation for Monthly payment

        double remainingPrincipal = amount;



         // Sets Remaining Balance

         double MonthlyInterest = 0;





         // saves interest payment

         double MonthlyAmt = 0;



         // saves principal payment

         //double x[] = new double[1]; x[0] = 0;

         // Number formatter to format output in table

         NumberFormat CurrencyFormatter = NumberFormat.getCurrencyInstance();

        Payment.setText(CurrencyFormatter.format(payment));

         LoanPayments.setText("Month\tPrincipal\tInterest\tEnding Balance\n");



         // double[] values = new double[months];

         // counting the month backward is confusing

         // for(;months > 0; months -- ) {

         int currentMonth = 0;    while(currentMonth < months) {



             //Append loop for mortgage detail in the text area

             MonthlyInterest = (remainingPrincipal * intRate);



             //Monthly Payment Toward Interest

             MonthlyAmt = (payment - MonthlyInterest);



             //Monthly Payment Toward Principal

             remainingPrincipal = (remainingPrincipal - MonthlyAmt);



             //Remaining loan Balance

             // values[months-1] = remainingPrincipal;

             LoanPayments.append((++currentMonth) + "\t" +

                     CurrencyFormatter.format(MonthlyAmt) + "\t" +

                    CurrencyFormatter.format(MonthlyInterest) + "\t" +

                     CurrencyFormatter.format(remainingPrincipal) + "\n");









             GraphArea.append("" + remainingPrincipal);

         }

     }



     public class GraphProgram extends JPanel



    {

         GraphCanvas graph = new GraphCanvas();



         public GraphProgram()

         {

            setLayout(new BorderLayout());

             setSize(300, 300);



            add(graph, BorderLayout.CENTER);

        }



        public void setValues(double[] values) {

            graph.setValues(values);

        }

        public class CoordCanvas extends Canvas

         {

             protected float viewLeft;

             protected float viewRight;

             protected float viewTop;

             protected float viewBottom;



             public void setXRange(float left, float right)

             {

                 viewLeft = left;

                 viewRight = right;

             }



             public void setYRange(float top, float bottom)

             {

                 viewTop = top;

                 viewBottom = bottom;

             }



             public float toX(float x)

            {

                 return (x - viewLeft) * getSize().width / (viewRight - viewLeft);

             }



             public float toY(float y)

             {

                 return (y - viewTop) * getSize().height / (viewBottom - viewTop);

             }



             public float toWidth(float w)

             {

                 return w * getSize().width / Math.abs(viewRight - viewLeft);

             }



             public float toHeight(float h)

             {

                 return h * getSize().height / Math.abs(viewBottom - viewTop);

             }

         }





         //  subclass to draw a bar graph



         class GraphCanvas extends CoordCanvas

         {

             private double[] vals = null;



            public  void setValues(double[] vals)

            {

                 this.vals = vals;

               repaint();

            }



            public void paint(Graphics comp)

           {

               if (vals == null || vals.length < 1)

                    return;



                 // find maximum value

                 double max = vals[0];

                 for (int i = 0; i < vals.length; i++)

                    if (vals[i] > max)

                        max = vals[i];



// set coordinate ranges

this.setXRange(0F, (float)vals.length);

this.setYRange((float)max, 0F);



// draw the graph

Graphics2D comp2D = (Graphics2D)comp;

for (int i = 0; i < vals.length; i++)

{

Rectangle2D.Float remainingPrincipal = new Rectangle2D.Float(toX((float)i),

toY((float)vals[i]), toWidth(1F), toHeight((float)vals[i]));

comp2D.fill(remainingPrincipal);

}

}

public static void main(String[] args)

{

Chris_Y_Week_5_IA frame= new Chris_Y_Week_5_IA();



}

}

}

}
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