Please help me with this grid bag layout!!

[Shawn Rieger]

I'm trying to get this example to work. I keep getting...

Cannot find symbol variable "container"
Cannot find symbol variable "Both"
Cannot find symbol variable "Center"
Cannot find symbol class "Inserts"

I don't understand what I'm doing wrong.

import java.awt.*;
import javax.swing.*;
 
public class ShowGridBagLayout extends JApplet {

private JLabel jlbl = new JLabel(
"Resize the Window and study GridBagLayout", JLabel.CENTER);

private JTextArea jta1 = new JTextArea("Text Area1", 5, 15);
private JTextArea jta2 = new JTextArea("Text Area2", 5, 15);
private JTextField jtf = new JTextField("JTextField");
private JPanel jp = new JPanel();
private JButton jbt1 = new JButton("Button 1");
private JButton jbt2 = new JButton("Button 2");

public ShowGridBagLayout() {
//Set GridBagLayout in the container
Container containter = getContentPane();
container.setLayout(new GridBagLayout());

//Create a GridBagConstraints object
GridBagConstraints gbConstraints = new GridBagConstraints();

gbConstraints.fill = GridBagConstraints.Both;
gbConstraints.anchor = GridBagConstraints.Center;

//Place JLabel to occupy row 0 (the first row)
addComp(jlbl, container, gbConstraints, 0, 0, 1, 4, 0, 0);
 
//Place text area 1 in row 1 and 2, and column 0
addComp(jta1, container, gbConstraints, 1, 0, 2, 1, 5, 1);
 
//Place text area 2 in row 1 and column 3
addComp(jta2, container, gbConstraints, 1, 3, 1, 1, 5, 1);

//Place text field in row 2 and column 3
addComp(jtf, container, gbConstraints, 2, 3, 1, 1, 5, 0);
 
//Place JButton 1 in row 3 and column 1
addComp(jbt1, container, gbConstraints, 3, 1, 1, 1, 5, 0);
 
//Place JButton 2 in row 3 and column 2
addComp(jbt2, container, gbConstraints, 3, 2, 1, 1, 5, 0);
 

//Place Panel in row 1 and 2, and column 1 and 2
jp.setBackground(Color.red);
jp.setBorder(new javax.swing.border.LineBorder(Color.black));
gbConstraints.insets = new Inserts(10,10,10,10);
addComp(jp, containter, gbConstraints, 1, 1, 2, 2, 10, 1);

}

/** Add a component to the containter of GridBagLayout */
private void addComp(Component c, Container container,
GridBagConstraints gbConstraints,
int row, int column,
int numberOfRows, int numberOfColumns,
double weightx, double weighty) {
// Set Parameters
gbConstraints.gridx = column;
gbConstraints.gridy = row;
gbConstraints.gridwidth = numberOfColumns;
gbConstraints.gridheight = numberOfRows;
gbConstraints.weightx = weightx;
gbConstraints.weighty = weighty;

// Add component to the container with the specified layout
container.add(c, gbConstraints);
}

}

[Michael Dunn]

if this is not an exercise in debugging, you will need to
download a copy of the api docs, and have them handy.

rather than tell you what the fixes are, I'll show you where
you can get the answers.

Cannot find symbol variable "container"
variable created in the program, check the spelling

Cannot find symbol variable "Both"
check the api docs for spelling/capitalization
i.e. go to the docs for the specific class (GridBagConstraints)
and check the member variables

Cannot find symbol variable "Center"
check the api docs for spelling/capitalization

Cannot find symbol class "Inserts"
check the api docs for spelling/capitalization

[Shawn Rieger]

ok, thanks for that. I always forget Java is so strict when it comes to case. I'm too use to VB lol. So I figured out all my problems in the above post, but have now ran into a new one. I created another class to call the layout but when I run it, nothing happens. No errors, no frame. I'm following this book I have exaclty and still can figure it out. Any ideas?

public class GridBagLayout {
public static void main(String[] args) {

ShowGridBagLayout frame = new ShowGridBagLayout();
frame.setSize(400, 400);
frame.setVisible(true);

}
}

[Michael Dunn]

perhaps this line
public class ShowGridBagLayout extends JApplet {

should be
public class ShowGridBagLayout extends JFrame {

[Shawn Rieger]

Ahh that was it. Can you tell me what the difference is? Becase my book's example uses JApplet, which obviously doesn't work.

[Michael Dunn]

A JApplet runs via a html page in a browser

A JFrame is a stand-alone program
(don't know if this is the best description)

[Shawn Rieger]

Ahhh, Thank you! I got it.