JTextArea scroll bar

[chop ficaro]

ive read that scroll bars are supposed to appear when the text exceeds the area, but for my program, they are not appearing. heres my program, click the radio buttons to add content to the text area and see that the scroll bar does not appear. i am running windows 7 64

  //main thread for Search Spider
import java.awt.AWTEvent;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.util.Vector;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;

public class AmpGUI extends JFrame implements ActionListener
{

	//text fields used by action methods for formula input/output
    JTextField OperatingTemperature;
    JTextField AmbientTemperature;
    JTextField InsulationThickness;
    JTextField PercentConductivity;
    JTextField StrandingIncrement;
    JTextField Elevation;
    JTextField AirVelocity;
    JTextField ThermalResistivityOfInsulation;
    JTextField CoefficientOfSolarAbsorption;
    JTextField CoefficientOfEmissivity;
    JTextField GMR;
    JTextField Latitude;
    JTextField Month;
    JTextField Date;
    JTextField LocalSunTime;
    JTextField AzimuthOfLine;
    JTextField Ampacity;
	
	//big output text area
	JTextArea debugSpace = new JTextArea();
	
	//main for Search Spider
    public static void main(String arg[]) 
	{
        new AmpGUI();
    }
    AmpGUI()
	{
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
        add(mainJPanel());
        pack();
        setVisible(true);
    }
	
	//debug space center to streatch
    private JPanel mainJPanel()
	{
        JPanel JPanel = new JPanel();
		BorderLayout layout = new BorderLayout();
		JPanel.setLayout(layout);
		JPanel.add(header(),BorderLayout.NORTH);
		JPanel.add(debugSpace,BorderLayout.CENTER);
        return(JPanel);
    }
	
	//input scections added because they do not need to streatch vertically
	private JPanel header() 
	{
        JPanel JPanel = new JPanel();
		BorderLayout layout = new BorderLayout();
		JPanel.setLayout(layout);
		JPanel.add(inputSections(),BorderLayout.CENTER);
        return(JPanel);
    }
	
	//2x2 grid requests top, 1x4 grid options bottom, neither vertically streatch
    private JPanel inputSections()
	{
        JPanel JPanel = new JPanel();
		BorderLayout layout = new BorderLayout();
		JPanel.setLayout(layout);
		JPanel.add(requests(),BorderLayout.NORTH);
		JPanel.add(radios(),BorderLayout.CENTER);
		JPanel.add(options(),BorderLayout.SOUTH);
        return(JPanel);
    }
	
	//stop lables from streatching
    private JPanel requests() 
	{
        JPanel JPanel = new JPanel();
		BorderLayout layout = new BorderLayout();
		JPanel.setLayout(layout);
		JPanel.add(lb(),BorderLayout.WEST);
		JPanel.add(tf(),BorderLayout.CENTER);
        return(JPanel);
    }
	
	private JPanel lb() 
	{
        JPanel JPanel = new JPanel();
		GridLayout layout = new GridLayout(17,1);
		JPanel.setLayout(layout);
	
		//lable fields in separate panel
		JLabel OperatingTemperature = new JLabel("Operating Temperature(C or F):");
		OperatingTemperature.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(OperatingTemperature);
		
		JLabel AmbientTemperature = new JLabel("Ambient Temperature(C or F):");
		AmbientTemperature.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(AmbientTemperature);
		
		JLabel InsulationThickness = new JLabel("Insulation Thickness (in or cm):");
		InsulationThickness.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(InsulationThickness);
		
		JLabel PercentConductivity = new JLabel("Percent Conductivity:");
		PercentConductivity.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(PercentConductivity);
		
		JLabel StrandingIncrement = new JLabel("Stranding Increment:");
		StrandingIncrement.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(StrandingIncrement);
		
		JLabel Elevation = new JLabel("Elevation (ft or m):");
		Elevation.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(Elevation);
		
		JLabel AirVelocity = new JLabel("AirVelocity (ft/s or m/s):");
		AirVelocity.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(AirVelocity);
		
		JLabel ThermalResistivityOfInsulation = new JLabel("Thermal Resistivity of Insulation:");
		ThermalResistivityOfInsulation.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(ThermalResistivityOfInsulation);
		
		JLabel CoefficientOfSolarAbsorption = new JLabel("Coefficient of Solar Absorption:");
		CoefficientOfSolarAbsorption.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(CoefficientOfSolarAbsorption);
		
		JLabel CoefficientOfEmissivity = new JLabel("Coefficient of Emissivity:");
		CoefficientOfEmissivity.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(CoefficientOfEmissivity);
		
		JLabel GMR = new JLabel("GMR (in or cm):");
		GMR.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(GMR);
		
		JLabel Latitude = new JLabel("Latitude:");
		Latitude.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(Latitude);
		
		JLabel Month = new JLabel("Month:");
		Month.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(Month);
		
		JLabel Date = new JLabel("Date:");
		Date.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(Date);
		
		JLabel LocalSunTime = new JLabel("Local Sun Time:");
		LocalSunTime.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(LocalSunTime);
		
		JLabel AzimuthOfLine = new JLabel("Azimuth of Line:");
		AzimuthOfLine.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(AzimuthOfLine);
		
		JLabel Ampacity = new JLabel("Ampacity (A):");
		Ampacity.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
		JPanel.add(Ampacity);
		
        return(JPanel);
    }
	
	private JPanel tf() 
	{
        JPanel JPanel = new JPanel();
		GridLayout layout = new GridLayout(17,1);
		JPanel.setLayout(layout);
		
		
		//declarations and default values
		OperatingTemperature = new JTextField("75");
        OperatingTemperature.addActionListener(this);
        JPanel.add(OperatingTemperature);
		
		AmbientTemperature = new JTextField("40");
        AmbientTemperature.addActionListener(this);
        JPanel.add(AmbientTemperature);
		
		InsulationThickness = new JTextField(".150");
        InsulationThickness.addActionListener(this);
        JPanel.add(InsulationThickness);
		
		PercentConductivity = new JTextField("61");
        PercentConductivity.addActionListener(this);
        JPanel.add(PercentConductivity);
		
		StrandingIncrement = new JTextField("1.02");
        StrandingIncrement.addActionListener(this);
        JPanel.add(StrandingIncrement);
		
		Elevation = new JTextField("0");
        Elevation.addActionListener(this);
        JPanel.add(Elevation);
		
		AirVelocity = new JTextField("2");
        AirVelocity.addActionListener(this);
        JPanel.add(AirVelocity);
		
		ThermalResistivityOfInsulation = new JTextField("350");
        ThermalResistivityOfInsulation.addActionListener(this);
        JPanel.add(ThermalResistivityOfInsulation);
		
		CoefficientOfSolarAbsorption = new JTextField(".9");
        CoefficientOfSolarAbsorption.addActionListener(this);
        JPanel.add(CoefficientOfSolarAbsorption);
		
		CoefficientOfEmissivity = new JTextField(".9");
        CoefficientOfEmissivity.addActionListener(this);
        JPanel.add(CoefficientOfEmissivity);
		
		GMR = new JTextField("1");
        GMR.addActionListener(this);
        JPanel.add(GMR);
		
		Latitude = new JTextField("30");
        Latitude.addActionListener(this);
        JPanel.add(Latitude);
		
		Month = new JTextField("6");
        Month.addActionListener(this);
        JPanel.add(Month);
		
		Date = new JTextField("10");
        Date.addActionListener(this);
        JPanel.add(Date);
		
		LocalSunTime = new JTextField("12");
        LocalSunTime.addActionListener(this);
        JPanel.add(LocalSunTime);
		
		AzimuthOfLine = new JTextField("270");
        AzimuthOfLine.addActionListener(this);
        JPanel.add(AzimuthOfLine);
		
		Ampacity = new JTextField();
        Ampacity.addActionListener(this);
        JPanel.add(Ampacity);

        return(JPanel);
    }
	
	
	//no need for layout
    private JPanel radios() 
	{

        JPanel JPanel = new JPanel();
		
		//Create the radio buttons.
        JRadioButton Aluminum = new JRadioButton("Aluminum");
        Aluminum.setActionCommand("Aluminum");
        Aluminum.setSelected(true);

        JRadioButton Copper = new JRadioButton("Copper");
        Copper.setActionCommand("Copper");

        //Group the radio buttons.
        ButtonGroup cm = new ButtonGroup();
        cm.add(Aluminum);
        cm.add(Copper);

        Aluminum.addActionListener(this);
        Copper.addActionListener(this);
		
		//Create the radio buttons.
        JRadioButton Inches = new JRadioButton("in, ft, ft/s");
        Inches.setActionCommand("Inches");
        Inches.setSelected(true);

        JRadioButton cent = new JRadioButton("cm, m, m/s");
        cent.setActionCommand("cent");

        //Group the radio buttons.
        ButtonGroup lengthUnit = new ButtonGroup();
        lengthUnit.add(Inches);
        lengthUnit.add(cent);

        Inches.addActionListener(this);
        cent.addActionListener(this);
		
		//Create the radio buttons.
        JRadioButton Celsius = new JRadioButton("Celsius");
        Celsius.setActionCommand("Celsius");
        Celsius.setSelected(true);

        JRadioButton Ferinheight = new JRadioButton("Ferinheight");
        Ferinheight.setActionCommand("Ferinheight");

        //Group the radio buttons.
        ButtonGroup tempUnit = new ButtonGroup();
        tempUnit.add(Celsius);
        tempUnit.add(Ferinheight);

        Celsius.addActionListener(this);
        Ferinheight.addActionListener(this);
		
		//Create the radio buttons.
        JRadioButton Concentric = new JRadioButton("Concentric");
        Concentric.setActionCommand("Concentric");
        Concentric.setSelected(true);

        JRadioButton Compact = new JRadioButton("Compact");
        Compact.setActionCommand("Compact");

        //Group the radio buttons.
        ButtonGroup ct = new ButtonGroup();
        ct.add(Concentric);
        ct.add(Compact);

        Concentric.addActionListener(this);
        Compact.addActionListener(this);

		//Create the radio buttons.
        JRadioButton f60Hz = new JRadioButton("60Hz");
        f60Hz.setActionCommand("f60Hz");
        f60Hz.setSelected(true);

        JRadioButton f50Hz = new JRadioButton("50Hz");
        f50Hz.setActionCommand("f50Hz");

        //Group the radio buttons.
        ButtonGroup fHz = new ButtonGroup();
        fHz.add(f60Hz);
        fHz.add(f50Hz);

        f60Hz.addActionListener(this);
        f50Hz.addActionListener(this);
		
		//Create the radio buttons.
        JRadioButton Clear = new JRadioButton("Clear");
        Clear.setActionCommand("Clear");
        Clear.setSelected(true);

        JRadioButton Cloudy = new JRadioButton("Cloudy");
        Cloudy.setActionCommand("Cloudy");

        //Group the radio buttons.
        ButtonGroup atm = new ButtonGroup();
        atm.add(Clear);
        atm.add(Cloudy);

        Clear.addActionListener(this);
        Cloudy.addActionListener(this);
		
		
		
		JPanel radioPanel = new JPanel(new GridLayout(3, 4));
        radioPanel.add(Concentric);
        radioPanel.add(Compact);
		radioPanel.add(Aluminum);
        radioPanel.add(Copper);
		radioPanel.add(f60Hz);
        radioPanel.add(f50Hz);
		radioPanel.add(Clear);
        radioPanel.add(Cloudy);
        radioPanel.add(Inches);
        radioPanel.add(cent);
		radioPanel.add(Celsius);
        radioPanel.add(Ferinheight);
		
		JPanel.add(radioPanel, BorderLayout.NORTH);
		
        return(JPanel);
    }
	
	
	//no need for layout
    private JPanel options() 
	{

        JPanel JPanel = new JPanel();
        JButton b1 = new JButton("Calculate Max Amps of Cable");
        b1.addActionListener(this);
        JPanel.add(b1, BorderLayout.SOUTH);
        JButton b2 = new JButton("Pick Cable Based on Max Amps");
        b2.addActionListener(this);
        JPanel.add(b2, BorderLayout.SOUTH);
		
        return(JPanel);
    }

	//actionPerformed cannot throw exception
    public void actionPerformed(ActionEvent event)
	{
        debugSpace.append("Action command " + event.getActionCommand() + "\n");
		
		//user clicks get amps
		if(event.getActionCommand() ==  "Calculate Max Amps of Cable")
		{

			int operatingTemperature = Integer.parseInt(OperatingTemperature.getText());
		    debugSpace.append("operatingTemperature " + operatingTemperature + "\n");
		}
		else if(event.getActionCommand() ==  "Pick Cable Based on Max Amps")
		{
		
			int operatingTemperature = Integer.parseInt(OperatingTemperature.getText());
		    debugSpace.append("operatingTemperature " + operatingTemperature + "\n");
		}
    }
	
	//exit when closed
    public void processWindowEvent(WindowEvent event)
	{
        if(event.getID() == WindowEvent.WINDOW_CLOSING)
            System.exit(0);
    }
}  

[Paul Clapham]

chop ficaro wrote:ive read that scroll bars are supposed to appear when the text exceeds the area...

I don't know where you read that, but it conflicts with what the API documentation for the class says:

The java.awt.TextArea internally handles scrolling. JTextArea is different in that it doesn't manage scrolling, but implements the swing Scrollable interface. This allows it to be placed inside a JScrollPane if scrolling behavior is desired, and used directly if scrolling is not desired.

[chop ficaro]

lol, the first google result for "JTextArea scroll" says that
lol those idiots, that's why i come here
i have my scroll pane now and it works great
TYVM