Adding a table of text to a TextArea

[aortell24]

Hello all, I have to create a program that allows the user to enter the loan and loan period in the number of years from a text field, and should display
the monthly and total payments for each interest rate starting from 5 percent to 8 percent, with increments of one-eight, in a text area.My question is how do I put a table of text into a text area.Here is what I need.

InterestRate            monthlyPayment                    Totalpayment
5.0                        188.71                                  11322.74
5.125                     189.28                                  11357.13
..                           ..                                         ..
and so on up to 8%.

[Tolls]

I believe a JTextArea recognises HTML markup, so a <table> might work?

[JosAH]

I believe a JTextArea recognises HTML markup, so a <table> might work?

Nope, JTextAreas are kind of stupid when it comes to formatted text; use a JEditorPane or a JTextPane for that purpose; I'd personally use a simple JTable for this purpose.

kind regards,

Jos

[aortell24]

Thanks guys I use JFormDesiner to do my GUI and I could not figure out how to add a third coolum to the JTable am I missing something or do I have to do that with code.

[aortell24]

My question is how do I put this print statement on the GUi

public class Quiz2CApp
{
    public static void main(String[] args)
    {
       LoanTable GUI = new LoanTable();
    }
}
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.GroupLayout;
/*
 * Created by JFormDesigner on Mon Jun 11 11:50:51 CDT 2012
 */



/**
 * @author Adam Ortell
 */
public class LoanTable extends JFrame {
    public LoanTable() {
        initComponents();
    }

    private void initComponents() {
        // JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
        // Generated using JFormDesigner non-commercial license
        panel1 = new JPanel();
        label1 = new JLabel();
        textField1 = new JTextField();
        label2 = new JLabel();
        textField2 = new JTextField();
        button1 = new JButton();
        scrollPane1 = new JScrollPane();

        //======== this ========
        Container contentPane = getContentPane();

        //======== panel1 ========
        {

            //---- label1 ----
            label1.setText("Loan Amount:");

            //---- label2 ----
            label2.setText("Number of Years:");

            //---- button1 ----
            button1.setText("Show Table");

            GroupLayout panel1Layout = new GroupLayout(panel1);
            panel1.setLayout(panel1Layout);
            panel1Layout.setHorizontalGroup(
                panel1Layout.createParallelGroup()
                    .addGroup(panel1Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(label1, GroupLayout.PREFERRED_SIZE, 90, GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(textField1, GroupLayout.PREFERRED_SIZE, 134, GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(label2, GroupLayout.PREFERRED_SIZE, 119, GroupLayout.PREFERRED_SIZE)
                        .addGap(1, 1, 1)
                        .addComponent(textField2, GroupLayout.PREFERRED_SIZE, 33, GroupLayout.PREFERRED_SIZE)
                        .addGap(50, 50, 50)
                        .addComponent(button1, GroupLayout.PREFERRED_SIZE, 100, GroupLayout.PREFERRED_SIZE)
                        .addGap(0, 19, Short.MAX_VALUE))
            );
            panel1Layout.setVerticalGroup(
                panel1Layout.createParallelGroup()
                    .addGroup(panel1Layout.createSequentialGroup()
                        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGroup(panel1Layout.createParallelGroup()
                            .addGroup(GroupLayout.Alignment.TRAILING, panel1Layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                .addComponent(textField1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                                .addComponent(label2)
                                .addComponent(label1))
                            .addGroup(GroupLayout.Alignment.TRAILING, panel1Layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                .addComponent(textField2, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                                .addComponent(button1))))
            );
        }

        GroupLayout contentPaneLayout = new GroupLayout(contentPane);
        contentPane.setLayout(contentPaneLayout);
        contentPaneLayout.setHorizontalGroup(
            contentPaneLayout.createParallelGroup()
                .addComponent(panel1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(scrollPane1, GroupLayout.DEFAULT_SIZE, 588, Short.MAX_VALUE)
        );
        contentPaneLayout.setVerticalGroup(
            contentPaneLayout.createParallelGroup()
                .addGroup(contentPaneLayout.createSequentialGroup()
                    .addComponent(panel1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED)
                    .addComponent(scrollPane1, GroupLayout.DEFAULT_SIZE, 221, Short.MAX_VALUE))
        );
        pack();
        setLocationRelativeTo(getOwner());
        // JFormDesigner - End of component initialization  //GEN-END:initComponents
    }

    // JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
    // Generated using JFormDesigner non-commercial license
    private JPanel panel1;
    private JLabel label1;
    private JTextField textField1;
    private JLabel label2;
    private JTextField textField2;
    private JButton button1;
    private JScrollPane scrollPane1;
    // JFormDesigner - End of variables declaration  //GEN-END:variables
    class actionEventHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent actionEvent)
        {
            double numerator;
            double denominator;
            double b, e;
            double numYears;
            double principal;


            System.out.println("Loan Amount: ");
            principal = Double.parseDouble(textField1.getText());
            System.out.println("Number of Years: ");
            numYears = Double.parseDouble(textField2.getText());
            System.out.println("Interest Rate | Monthly Payment | Total Payment");


            for ( double intRate = 5; intRate <= 8; intRate = Math.round((intRate + .125) * 1000.0)/1000.0 )
            {
                numerator = intRate/100.0 * principal / 12;
                e = -(12 * numYears);
                b = (intRate/100.0 / 12) + 1.0;
                denominator = 1.0 - Math.pow(b, e);
                System.out.println( intRate + "% | $" + Math.round((numerator / denominator)*100.0) / 100.0 +
                        " | $" + Math.round(((numerator / denominator) * 12 * numYears) * 100.0) / 100.0);
            }
        }
    }
}

What do you think would be the best way to add that print statement to a GUI.
Thanks alot guys.

[DarrylBurke]

What do you think would be the best way to add that print statement to a GUI.

Learn AWT / Swing.

Write code.

Visual designers are for experts who are already beyond that. Not for beginners.

db

[aortell24]

I have figured it out now I am just trying to get the columns aligned with the Interest and monthly payments. I always feel like that GUI designer was cheating my teacher swears by them.Thanks for the tip.

[aortell24]

Thanks I always though that was cheating but my teacher swears by them. I figured it out , but is there a way to format JtextArea.appends output like you can with
printf.

[Tolls]

Nope, JTextAreas are kind of stupid when it comes to formatted text; use a JEditorPane or a JTextPane for that purpose; I'd personally use a simple JTable for this purpose.

kind regards,

Jos

Oh right.
I would have suggested a JTable (which is sort of the obvious answer), but I got the impression from the OP that the JTextArea was a requirement.
Hey, it's a class exercise and we all know how odd the requirements for those can be!

[aortell24]

It was a requirement to use a textArea.Which I still don't understand being how it could not be formatted correctly.Thanks for all the help guys.

[Tolls]

If you use printf to generate the strings then that might help.
That way you could sort out padding at least.
Then just append that string to the area?

[JosAH]

And: use a fixed width font (possibly in combination with tabs instead of spaces).

kind regards,

Jos

[Tolls]

I only ever think in terms of fixed width...I have a mono-spaced mind.
:)

[JosAH]

I only ever think in terms of fixed width...I have a mono-spaced mind.
:)

Me too; I prefer all character columns neatly layed out next to each other; all the rest are post modern frillies and they make wibbly columns ;-)

kind regards,

Jos