Hello World message disappeared?!

5 Message(s) by 3 Author(s) originally posted in java misc

From: Geoff Cox

Date: Friday, July 15, 2005

Hello,

I am trying out some of the Sun

<digital signal processing> The result of measuring the
	amplitude of an analog signal at a specified time.  In
	{digital signal processing} a sample is a signed or unsigned
	number and the number of samples per second is called the
	{sample rate}.

	(2001-06-06)

code

<software> Instructions for a computer in some programming
	language, often {machine language}.  The word "code" is often
	used to distinguish instructions from {data} (e.g. "The code
	is marked 'read-only'") whereas "{software}" is used in
	contrast with "{hardware}" and may consist of more than just
	code.

	(2000-04-08)

and starting to learn
about swing gui etc.

I've added the slider object

<object-oriented> In {object-oriented programming}, an
	instance of the data structure and behaviour defined by the
	object's {class}.  Each object has its own values for the
	{instance variables} of its class and can respond to the
	{methods} defined by its class.

	For example, an object of the "Point" class might have
	instance variables "x" and "y" and might respond to the "plot"
	method by drawing a dot on the screen at those coordinates.

	(2004-01-26)

and now the Hello World message

In {object-oriented programming} sending a message to an
	{object} (to invoke a {method}) is equivalent to calling a
	{procedure} in traditional programming languages, except that
	the actual code executed may only be selected at run time
	depending on the {class} of the object.  Thus, in response to
	the message "drawSelf", the method code invoked would be
	different if the target object were a circle or a square.

	(1995-02-16)

no
longewr appears. Why is this?

Thanks

Geoff

import

<data> To read data that is not in the native format of the
	application.  For example, a {web browser} will have its own
	way of storing {bookmarks} but it will usually provide a
	function to import bookmarks from {Internet Explorer}.  The
	alternative is to provide an independent external conversion
	utility but this is usually less convenient for the user.

	(2004-11-15)

JAVAx.swing.*;

public class

1. <programming> The prototype for an {object} in an
	{object-oriented language}; analogous to a {derived type} in a
	{procedural language}.  A class may also be considered to be a
	set of objects which share a common structure and behaviour.
	The structure of a class is determined by the {class
	variables} which represent the {state} of an object of that
	class and the behaviour is given by a set of {methods}
	associated with the class.

	Classes are related in a {class hierarchy}.  One class may be
	a specialisation (a "{subclass}") of another (one of its
	"{superclasses}") or it may be composed of other classes or it
	may use other classes in a {client-server} relationship.  A
	class may be an {abstract class} or a {concrete class}.

	See also {signature}.

	2. <programming> See {type class}.

	3. <networking> One of three types of {Internet addresses}
	distinguished by their most significant bits.

	3. <language> A language developed by the {Andrew Project}.
	It was one of the first attempts to add {object-oriented}
	features to {C}.

	(1995-05-01)

HelloWorldSwing {
/**
* Create the GUI

<operating system> (GUI) The use of pictures rather than just
	words to represent the input and output of a program.  A
	program with a GUI runs under some {windowing system}
	(e.g. The {X Window System}, {MacOS}, {Microsoft Windows},
	{Acorn} {RISC OS}, {NEXTSTEP}).  The program displays certain
	{icons}, {buttons}, {dialogue boxes}, etc. in its {windows} on
	the screen and the user controls it mainly by moving a
	{pointer} on the screen (typically controlled by a {mouse})
	and selecting certain objects by pressing buttons on the mouse
	while the pointer is pointing at them.  This contrasts with a
	{command line interface} where communication is by exchange of
	strings of text.

	Windowing systems started with the first {real}-time graphic
	display systems for computers, namely the {SAGE} Project
	[Dates?] and {Ivan Sutherland}'s {Sketchpad} (1963).  {Douglas
	Engelbart}'s {Augmentation of Human Intellect} project at
	{SRI} in the 1960s developed the {On-Line System}, which
	incorporated a mouse-driven cursor and multiple windows.
	Several people from Engelbart's project went to Xerox PARC in
	the early 1970s, most importantly his senior engineer, {Bill
	English}.  The Xerox PARC team established the {WIMP} concept,
	which appeared commercially in the {Xerox 8010} (Star) system
	in 1981.

	Beginning in 1980(?), led by {Jef Raskin}, the {Macintosh}
	team at {Apple Computer} (which included former members of the
	Xerox PARC group) continued to develop such ideas in the first
	commercially successful product to use a GUI, the Apple
	Macintosh, released in January 1984.  In 2001 Apple introduced
	{Mac OS X}.

	{Microsoft} modeled the first version of {Windows}, released
	in 1985, on Mac OS.  Windows was a GUI for {MS-DOS} that had
	been shipped with {IBM PC} and compatible computers since
	1981.  Apple sued Microsoft over infringement of the
	look-and-feel of the MacOS.  The court case ran for many
	years.

	[Wikipedia].

	(2002-03-25)

and show it. For thread

1. See {multithreading}.

	2. See {threaded code}.

	3. {topic thread}.

	[{Jargon File}]

safety,
* this method

<programming> The name given in {Smalltalk} and other
	{object-oriented languages} to a procedure or routine
	associated with one or more {classes}.  An {object} of a
	certain class knows how to perform actions, e.g. printing
	itself or creating a new instance of itself, rather than the
	function (e.g. printing) knowing how to handle different types
	of object.

	Different classes may define methods with the same name
	(i.e. methods may be {polymorphic}).  The term "method" is used
	both for a named operation, e.g. "PRINT" and also for the code
	which a specific class provides to perform tha
	t operation.

	Most methods operate on objects that are instances of a
	certain class.  Some object-oriented languages call these
	"object methods" to distinguish then from "{class methods}".

	In {Smalltalk}, a method is defined by giving its name,
	documentation, temporary local variables and a sequence of
	expressions separated by "."s.

	(2000-03-22)

should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we've nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);

//Create and set up the window.
JFrame frame

1. <networking> A {data link layer} "packet" which contains the
	header and trailer information required by the physical
	medium.  That is, {network layer} {packets} are encapsulated
	to become frames.

	See also {datagram}, {encapsulation}, {packet}, {Maximum
	Transmission Unit}.

	2. <programming> (language implementation) See {activation
	record}.

	3. <hardware> One complete scan of the active area of a
	{display screen}.  Each frame consists of a number N of
	horizontal {scan lines}, each of which, on a computer display,
	consists of a number M of {pixels}.  N is the {vertical
	resolution} of the display and M is the {horizontal
	resolution}.  The rate at which the displayed image is updated
	is the {refresh rate} in frames per second.

	(2000-10-07)

= new JFrame("HelloWorldSwing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800, 600);

//Add the ubiquitous "Hello World" label.
JLabel label = new JLabel("Hello World");
frame.getContentPane().add(label);

//Add slider
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 20, 1);
frame.getContentPane().add(slider);

//Display the window.

// frame.pack();
frame.setVisible(true);
}

public static void main(String[] args) {
//Schedule a job

<operating system> All activities involved in completing any
	project on a computer from start to finish.  A job may involve
	several {processes} and several {programs}.

	This term originates from a time when a user would manually
	submit a job as a deck of {punched cards} which would
	typically include {source code} interspersed with {job control
	language} instructions to guide phases of the job such as
	{compilation}, {linking}, {execution} and printing.

	(2005-03-16)

for the event-dispatching thread:
//creating and showing this application's GUI.
JAVAx.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}

From: Andrew Thompson

Date: Friday, July 15, 2005

wrote in message:

I am trying out some of the Sun JAVA sample code and starting to learn
about swing gui etc.

First you need to learn about AWT

<graphics> (AWT) {Java}'s {platform}-independent {windowing},
	graphics, and user-interface {toolkit}.  The AWT is part of
	the {Java Foundation Classes} (JFC) - the standard {API} for
	providing a {graphical user interface} (GUI) for a Java
	program.

	Compare: {SWING}.

	["Java in a Nutshell", O'Reilly].

	{Home (http://java.sun.com/products/jdk/awt/)}.

	(2000-07-26)

layouts
(specifically BorderLayout[1], in this instance).
[1] <http://JAVA.sun.com/j2se/1.5.0/docs/api/JAVA/awt/BorderLayout.html>

GUI questions are best pursued on the GUI group

A group G is a non-empty {set} upon which a {binary} operator
	* is defined with the following properties for all a,b,c in G:

	  Closure:     G is closed under *,  a*b in G
	  Associative: * is associative on G, (a*b)*c = a*(b*c)
	  Identity:    There is an identity element  e  such that
		       a*e = e*a = a.
	  Inverse:     Every element has a unique inverse a' such that
		       a * a' = a' * a = e.  The inverse is usually
		       written with a superscript -1.

	(1998-10-03)

.
<http://www.physci.org/codes/JAVAfaq.jsp#cljg>

Please note that the group 'comp.lang.JAVA.misc' is
not one of the more productive groups, I'll set the
Follow-Ups of this message to c.l.j.programmer only.

Check the other groups listed at the GUI link

1. <file system> {hard link} or {symbolic link}.

	2. <hypertext> {hyperlink}.

	(1997-10-22)

for a
brief run-down of the major JAVA groups.

HTH

--
Andrew Thompson
physci.org 1point1c.org JAVAsaver.com lensescapes.com athompson.info
Mr Bender's Wardrobe By ROBOTANY 500

From: Thomas Fritsch

Date: Friday, July 15, 2005

wrote in message:

Hello,
Hello!
I am trying out some of the Sun JAVA sample code and starting to learn
about swing gui etc.
I've added the slider object and now the Hello World message no
longer appears. Why is this?

Because the JFrame's contentPane a has BorderLayout as its
LayoutManager. You add both components (the label and the slider)
without specifying a constraint

<programming, mathematics> A {Boolean} {relation}, often an
	equality or {ineqality} relation, between the values of one or
	more mathematical variables (often two).  E.g. x>3 is a
	constraint on x.  {constraint satisfaction} attempts to assign
	values to variables so that all constraints are true.

	{Usenet} newsgroup: {news:comp.constraints}.  {FAQ
	(http://www.cs.unh.edu/ccc/archive/)}.

	(2002-06-08)

for each. So both get added with the
same default constraint (which happens to be BorderLayout.CENTER).
Solution: You've to add both components with different constraints
(see below in your code)

Thanks
Geoff
import JAVAx.swing.*;

import JAVA.awt.BorderLayout;

public class HelloWorldSwing {
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we've nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("HelloWorldSwing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800, 600);
//Add the ubiquitous "Hello World" label.
JLabel label = new JLabel("Hello World");
//frame.getContentPane().add(label);

frame.getContentPane().add(label, BorderLayout.CENTER);

//Add slider
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 20, 1);
//frame.getContentPane().add(slider);

frame.getContentPane().add(slider, BorderLayout.SOUTH);

//Display the window.
// frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
JAVAx.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
--

"Thomas

<language> A language compatible with the language
	{Dylan}(TM).  Thomas is NOT {Dylan}(TM).

	The first public release of a translator to {Scheme} by Matt
	Birkholz, Jim Miller, and Ron Weiss, written at {Digital
	Equipment Corporation}'s {Cambridge Research Laboratory} runs
	(slowly) on {MIT}'s {CScheme}, DEC's {Scheme->C}, Marc
	Feeley's {Gambi}, {Macintosh}, {PC}, {Vax}, {MIPS}, {Alpha},
	{680x0}.

	{(ftp://gatekeeper.pa.dec.com/pub/DEC/Thomas)}.

	Mailing list: <info-thomas@crl.dec.com>.

	["Dylan(TM) an object-oriented dynamic language", {Apple
	Computer}, Eastern Research and Technology, April 1992].

	(1992-09-11)

:Fritsch$ops:de".replace(':','.').replace('$','@xxxxxxxxxxx')

From: Geoff Cox

Date: Friday, July 15, 2005

On Fri, 15 Jul 2005 10:43:57 GMT, Thomas Fritsch
wrote in message:

wrote in message:
Hello,
Hello!

I am trying out some of the Sun JAVA sample code and starting to learn
about swing gui etc.

I've added the slider object and now the Hello World message no
longer appears. Why is this?
Because the JFrame's contentPane a has BorderLayout as its
LayoutManager. You add both components (the label and the slider)
without specifying a constraint for each. So both get added with the
same default constraint (which happens to be BorderLayout.CENTER).
Solution: You've to add both components with different constraints
(see below in your code)

Thomas - many thanks - a little more mist has cleared!

Cheers

Geoff

Thanks

Geoff

import JAVAx.swing.*;
import JAVA.awt.BorderLayout;

public class HelloWorldSwing {
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we've nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);

//Create and set up the window.
JFrame frame = new JFrame("HelloWorldSwing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800, 600);

//Add the ubiquitous "Hello World" label.
JLabel label = new JLabel("Hello World");
//frame.getContentPane().add(label);
frame.getContentPane().add(label, BorderLayout.CENTER);
//Add slider
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 20, 1);
//frame.getContentPane().add(slider);
frame.getContentPane().add(slider, BorderLayout.SOUTH);

//Display the window.

// frame.pack();
frame.setVisible(true);
}

public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
JAVAx.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}

From: Geoff Cox

Date: Friday, July 15, 2005

On Fri, 15 Jul 2005 10:34:12 GMT, Andrew Thompson
wrote in message:

wrote in message:
I am trying out some of the Sun JAVA sample code and starting to learn
about swing gui etc.
First you need to learn about AWT layouts
(specifically BorderLayout[1], in this instance).
[1] <http://JAVA.sun.com/j2se/1.5.0/docs/api/JAVA/awt/BorderLayout.html>
GUI questions are best pursued on the GUI group.
<http://www.physci.org/codes/JAVAfaq.jsp#cljg>
Please note that the group 'comp.lang.JAVA.misc' is
not one of the more productive groups, I'll set the
Follow-Ups of this message to c.l.j.programmer only.
Check the other groups listed at the GUI link for a
brief run-down of the major JAVA groups.

Andrew,

Thanks for the pointers.

Cheers

Geoff

HTH

Next Message: tomcat woes

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