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BOOK: Beginning Java 2, JDK 5 Edition
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Old January 25th, 2011, 10:39 PM
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Default Possible version issues?

Hi, I just started getting into Java, and got through the book to Chapter 17 before I had access to the source code and other downloads.

On my Mac 10.6.6 with java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04-307-10M3261)
Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03-307, mixed mode)

I tried to copy an example program from Chapter 17, the


package tryboxlayout;

import java.awt.Toolkit;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.BoxLayout;
import javax.swing.Box;
import javax.swing.ButtonGroup;
import javax.swing.JRadioButton;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.BorderFactory;
import javax.swing.border.Border;

public class TryBoxLayout {
// The window object
static JFrame aWindow = new JFrame("This is a Box Layout");

public static void main(String[] args) {
Toolkit theKit = aWindow.getToolkit(); // Get the window toolkit
Dimension wndSize = theKit.getScreenSize(); // Get screen size

// Set the position to screen center & size to half screen size
aWindow.setBounds(wndSize.width/4, wndSize.height/4, // Position
wndSize.width/2, wndSize.height/2); // Size
aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CL OSE);

// Create left column of radio buttons
Box left = Box.createVerticalBox();
ButtonGroup radioGroup = new ButtonGroup(); // Create button group
JRadioButton rbutton; // Stores a button
radioGroup.add(rbutton = new JRadioButton("Red")); // Add to group
left.add(rbutton); // Add to Box
radioGroup.add(rbutton = new JRadioButton("Green"));
left.add(rbutton);
radioGroup.add(rbutton = new JRadioButton("Blue"));
left.add(rbutton);
radioGroup.add(rbutton = new JRadioButton("Yellow"));
left.add(rbutton);

// Create right columns of checkboxes
Box right = Box.createVerticalBox();
right.add(new JCheckBox("Dashed"));
right.add(new JCheckBox("Thick"));
right.add(new JCheckBox("Rounded"));

// Create top row to hold left and right
Box top = Box.createHorizontalBox();
top.add(left);
top.add(right);
// Create bottom row of buttons
JPanel bottomPanel = new JPanel();
Border edge = BorderFactory.createRaisedBevelBorder(); // Button border
JButton button;
Dimension size = new Dimension(80,20);
bottomPanel.add(button = new JButton("Defaults"));
button.setBorder(edge);
button.setPreferredSize(size);
bottomPanel.add(button = new JButton("OK"));
button.setBorder(edge);
button.setPreferredSize(size);
bottomPanel.add(button = new JButton("Cancel"));
button.setBorder(edge);
button.setPreferredSize(size);

// Add top and bottom panel to content pane
Container content = aWindow.getContentPane(); // Get content pane
content.setLayout(new BorderLayout()); // Set border layout manager
content.add(top, BorderLayout.CENTER);
content.add(bottomPanel, BorderLayout.SOUTH);
aWindow.pack();
aWindow.setVisible(true); // Display the window
}
}

And it will not run. In Netbeans it will build successfully, but no pop up window. If I compile it for cmdln, I call it as java -jar and get no return.

Is this going to be a further issue, is there something I can do to correct it?

Thanks.





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