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Thread: I'm supposed to see text in this window

  1. #1
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    Default I'm supposed to see text in this window

    import javax.swing.*;
    import java.awt.*;
     
    public class HelloJava {
            public static void main( String[] args ) {
                        JFrame frame = new JFrame( "Hello, Java!" );
                        frame.setSize( 300, 300 );
                        frame.setVisible( true );
                        class HelloComponent extends JComponent {
                            public void paintComponent( Graphics g ) {
                                                            g.drawString( "Hello, Java!", 125, 95 );                                        
                        HelloComponent hello = new 
                        HelloComponent();
                        frame.add( "hello" );
                                }
                            }
            }
    }

    I'm following this E-book i got from the android market (O'Reilly), and so far i got a lot of minor errors, and the book doesn't show how to fix it, so i was hoping you could help me out. (also, this is my first serious attempt to learn programming).
    I'm using Eclipse


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: I'm supposed to see text in this window

    got a lot of minor errors,
    Copy and paste the error messages here.

    Have you written any classes before? You should probably start with writing a simple class instead of copy some code that is not well formed and trying to make that work.

  3. #3
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    Default Re: I'm supposed to see text in this window

    Actually, i get only 2 errors with this class. In the sideline, at the last line (frame.add( "hello" ) i see this:



    If i understood it correctly, i should a text like "Hello Java!" in the middle of the screen, and when i would resize the window, but the text would not move with it.
    This is the first step i've attempted to serious programming, but it kinda blows. I read alot of pages where i learn the basics, but when i write the code, i know very little of what i'm actually writing. I have been told that this code is a GUI component, and it's not clever to learn Java with that. (i've ordered another book which works with BlueJ)
    Last edited by Ypmaha; March 9th, 2012 at 11:32 AM.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: I'm supposed to see text in this window

    You should go through a java tutorial or text book before trying to code a program. There are several things wrong with the code you are posting.

    One very basic thing that will make the code easier to read and understand is proper formatting.
    The posted code is a mess. I don't have a tutorial on the proper coding style but you definitely need to find one if you are going to post code and ask others for help.

    To fix your code: move the class definition out of the main method.

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