Java Swing program prob

TARE

import javax.swing.*;

public class HelloWorldSwing {

public static void main(String[] args) {

JFrame frame = new JFrame("HelloWorldSwing");
final JLabel label = new JLabel("Hello World");
frame.getContentPane().add(label);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);

}
}

---

C:\java\HelloWorldSwing.java:2: Package javax.swing not found in import.
import javax.swing.*;
^
1 error

---

It's supose to display "Hello world" in a window but I don't seem to have the classes needed for Swing. I have JDK1.1.8 and I downloaded JDK 1.2.2 today to see if that world work but I got the same error. I dirrected my complier ( JCreator LE - www.jcreator.com ) to both JDK 1.1.8 and JDK 1.2.2 directories.

Can anyone tell me what I have to download or what I have to do to fix this error.

Cheer's, BoB.

DeadBankClerk

Google Says:
http://forum.java.sun.com/thread.jsp?thread=109755&forum=54&message=291267

Guys,
In the paths you have to include the ";" at the end of the
classpath. Also notice the ".;" in the beginning of the line.

set classpath=%classpath%;.;c:\jdk1.3\bin;

TARE

C:\jdk1.2.2\jre\lib\rt.jar;C:\jdk1.2.2\jre\lib\i18n.jar;C:\jdk1.2.2\lib\dt.jar;C:\jdk1.2.2\lib\tools.jar;C:\jdk1.2.2\jre\lib\ext\iiimp.jar;C:\jdk1.2.2\bin

All of the class paths above where added automaticly when i dirrected JCreator to the JDK 1.2.2 director. I added the C:\jdk1.2.2\bin but I still getting the same error

Maybe it's because there using JDK 1.3 ? I've already downloaded JDK 1.2.2 today which is 20 megs, I taught 1.2.2 was the latest version. Can anyone else tell me something I can do before I download another 20 megs ?

lynchie

Have you tried compiling the code from the command line first?

Also, to ensure that you are using the correct version of the jre, open the rt.jar file in winzip and check that there is a folder in it called javax/swing with a load of java classes in it

bonkey

It's supose to display "Hello world" in a window but I don't seem to have the classes needed for Swing. I have JDK1.1.8 and I downloaded JDK 1.2.2 today to see if that world work but I got the same error. I dirrected my complier ( JCreator LE - www.jcreator.com ) to both JDK 1.1.8 and JDK 1.2.2 directories.
[/B]

In JCreator (which I use), you should have "auto-completion". Thus, when you do "import javax.", it should present you with a list of matches - one of which is swing on my machine.

If you dont get this, then you definitely have a problem with your classes. Check the project settings to see what JDK Profile you have enabled. Then check the JDK Profile to see that it is set up correctly - it should have a number of classes (jars mostly) listed for you.

I'm guessing your problem is with JCreator config, and not with java itself - you shouldnt need a newer version than 1.2.2 for what youre doing. Consider compiling from the command line to test this, or see about fixing your jcreator install.

Oh - and get the full JCreator, as opposed to JC Lite. License it if you can afford to do so, because you then get access to the pre-release of 2.5 which is far far better.

jc

TARE

Compiling from the command line is compiling from DOS ?
I did this and got a new error.

---

C:\WINDOWS>cd\

C:\>path = c:\jdk1.2.2\bin

C:\>cd java

C:\java>javac HelloWorldSwing.java
HelloWorldSwing.java:10: No variable EXIT_ON_CLOSE defined in class javax.swing.
JFrame.
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
^
1 error

C:\java>

---

In JCreator (which I use), you should have "auto-completion". Thus, when you do "import javax.", it should present you with a list of matches - one of which is swing on my machine.

I'm not sure what you mean by "auto-completion" ?

Cheers for the help so far, I'll look in to getting Jcreator Pro.

lynchie

Ok, Well this means that it is picking up the javax.swing.* classes in DOS. So it is obviously not picking up the correct classes within your IDE (JCreator).

The reason why you are getting the compile error from dos is because that field was only added to jdk1.3

Docs from jdk1.3

EXIT_ON_CLOSE

public static final int EXIT_ON_CLOSE

The exit application default window close operation. If a window has this set as the close operation and is closed in an applet, a SecurityException may be thrown. It is recommended you only use this in an application.

Since:
1.3

I cannot remember off hand what the old way of doing that was, but I think you should be able to comment out that line and get it compiling fine.

phobos

Is it just me or is 9/10 java oriented problems associated with CLASSPATHs on this board?

The problem needs fixing so I will do a tutorial on it later on tonight. See back tomorrow for the full thing, or else late tonight. The tutorial will be jdk/ide independant so you can implement it anyway you want, and it will still work.

Nobody needs to feel inferior just because they are getting CLASSPATH related errors. Because IMO it's something that people seem to overlook in the beginning when learning Java. A lot of command line gurus take it for granted, and then whinge when the compiler throws a java.lang.ClassNotFoundException

I will post the link later, c ya

;-phobos-)

phobos

Anyway,

Here is my CLASSPATH tutorial

HTH

;-phobos-)