Simple quesiton on JTextArea, scroll bar

HI, all java programmers, i think my question is simple...pls help ...
I use the following coding to add a scrollable textarea to my JPanel , panelSouth.
details = new JTextArea();
JScrollPane scrollPane = new JScrollPane(details,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
panelSouth.add( scrollPane, BorderLayout.CENTER );
i wanna to append text to the text area.
i use details.append("my text");
however, any method can scrol down the text area? so that my new text can be
shown automatically when a new text was added?
the scrol bar won't scroll down when i add text.
if i add a large amount of text.. user
need to scrol down to see the newest text..
and also, user , may not know some new text was added...
thx all experts...
yours,
terry

details.setCaretPosition(details.getText().length());
Noah

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import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.text.*;
import java.math.*;
import java.util.*;
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public class Week3Assignment407B extends JFrame implements ActionListener
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     private JPanel jPanelRateAndTermSelection;
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     private JMenuItem exitMenuItem;
     private JMenu fileMenu;
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     private JPanel jPanelEnterPrincipal;
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     private JLabel jLabelPaymentOutput;
     private JPanel jPanelErrorOutput;
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          jPanelEnterPrincipal.add(jTextFieldMortgageAmt);
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          TermAndRate.addItem("15 years at 5.5%");
          TermAndRate.addItem("30 years at 5.75%");
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               JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                 JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
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               try
                    principal = Double.parseDouble(jTextFieldMortgageAmt.getText());
               catch(NumberFormatException nfe)
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                              + " Please try again. Please do not use commas or decimals");
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                                        + "\n"
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here's your initComponents with a couple of changes, the problem was the Gridlayout(15,1)
also, the scrollpane needed a setPreferredSize()
private void initComponents()
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    jLabelPrincipal = new JLabel("Amt to borrow in whole numbers");
    jTextFieldMortgageAmt = new JTextField(10);
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    jLabelChooseRateAndTerm = new JLabel("Choose the Rate and Term");
    buttonCompute = new JButton("Compute Mortgage");
    buttonNew = new JButton("New Mortgage");
    buttonClose = new JButton("Close");
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    jPanelRateAndTermSelection.setLayout(RateAndTerm);
    jPanelRateAndTermSelection.add(jLabelChooseRateAndTerm);
    TermAndRate = new JComboBox();
    jPanelRateAndTermSelection.add(TermAndRate);
    TermAndRate.addItem("7 years at 5.35%");
    TermAndRate.addItem("15 years at 5.5%");
    TermAndRate.addItem("30 years at 5.75%");
    jPanelRateAndTermSelection.add(buttonCompute);
    jPanelRateAndTermSelection.add(buttonNew);
    jPanelRateAndTermSelection.add(buttonClose);
    pane.add(jPanelRateAndTermSelection);
    jPanelAmoritizationSchedule = new JPanel();
    jTextAreaAmoritization = new JTextArea(26,50);
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      JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    scrollBar.setPreferredSize(new Dimension(500,100));//<------------------------
    jPanelAmoritizationSchedule.add(scrollBar);
    getContentPane().add(pane,BorderLayout.NORTH);
    getContentPane().add(jPanelAmoritizationSchedule,BorderLayout.CENTER);
    exitMenuItem.addActionListener(this);
    buttonCompute.addActionListener(this);
    buttonNew.addActionListener(this);
    buttonClose.addActionListener(this);
    TermAndRate.addActionListener(this);
    jTextFieldMortgageAmt.addActionListener(this);
    jPanelErrorOutput = new JPanel();
    jLabelErrorOutput = new JLabel();
    FlowLayout error = new FlowLayout();
    jPanelErrorOutput.setLayout(error);
    //pane.add(jLabelErrorOutput);not worrying about this one
    //setContentPane(pane);
    pack();
    setVisible(true);
}instead of
if (TermAndRate.getSelectedItem() == "7 years at 5.35%") ;
Term = 7;
IntRate = 5.35;
you would be better off setting up arrays
int[] term = {7,15,30};
double[] rate = {5.35,5.50,5.75};
then using getSelectedIndex()
int loan = TermAndRate.getSelectedIndex()
Term = term[loan];
IntRate = rate[loan];

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Attachments:
trial8.vi ‏95 KB
trial8.vi ‏95 KB
0_1024.txt ‏25 KB

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Simple quesiton on JTextArea, scroll bar

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