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Thread: Need help with some coding

  1. #1
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    Default Need help with some coding

    I'm working on a program that has three buttons... one that plays a video, one that displays information, and one that I want to take information from a random generator and display it in a text field. My first question is how do I tell the generator to display the text in the text field. My second question is, how do I get the button to run this other class.


  2. #2
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    Default Re: Need help with some coding

    One thing at a time. Which part of this is giving you trouble? Do you know how to process an event from a button click? Do you know how to use a random generator? Do you know how to set the text of a text field? Provide an SSCCE demonstrating exactly which step you're confused about, and we'll go from there.
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  3. #3
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    Default Re: Need help with some coding

    I'm sorry... i do realize it was a bit rushed. I have no idea how to make an SSCCE but I will explain exactly what I am trying to do. I'm making a compliment generator. Using a the switch function I've set it to generate a number and then output a result. I want It to display the result next to the to "generate" button in a text field I placed next to it.

    Here's the compliment generator code so far:

    import java.util.Random;
     
    public class Compliment {
     
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		Random myRandom = new Random();
    		int randomNumber;
     
    		randomNumber = myRandom .nextInt(10) + 1;
     
    		switch (randomNumber) {
    		case 1:
    		case 2:
    		case 3:
    		case 4:
    		case 5:
    		case 6:
    		case 7:
    		case 8:
    		case 9:
    		case 10:
    		default:
     
    		}
     
    	}
     
    }

    I have the button set up with an action listener. What is the syntax required for me to say "run compliment.java" on a mouse click.

  4. #4
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    Default Re: Need help with some coding

    Sorry... I realize it was a bit rushed...

    here's the code for the generator so far:

    import java.util.Random;
     
    public class Compliment {
     
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		Random myRandom = new Random();
    		int randomNumber;
     
    		randomNumber = myRandom .nextInt(10) + 1;
     
    		switch (randomNumber) {
    		case 1:
    		case 2:
    		case 3:
    		case 4:
    		case 5:
    		case 6:
    		case 7:
    		case 8:
    		case 9:
    		case 10:
    		default:
     
    		}
     
    	}
     
    }

    I want any output from this generator to be displayed in the text field next to the generate button which is set up with a action listener. What is the syntax needed to say "print to JTextPane" and what is the syntax needed to say "run compliment.class" on a mouse click

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Need help with some coding

    I don't see any GUI code in what you have posted. Have you looked at the tutorial to see how to write some:
    Trail: Creating a GUI With JFC/Swing (The Java™ Tutorials)
    If you don't understand my answer, don't ignore it, ask a question.

  6. #6
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    Default Re: Need help with some coding

    (Sorry for posting twice... my post didn't show up right after posting... both times)
    This is not the code for the GUI... just the beginnings of my random compliment generator...

    This is the code for the GUI, I'm using window builder with eclipse to do it:

    import java.awt.EventQueue;
     
    import javax.swing.JFrame;
    import javax.swing.JButton;
    import java.awt.BorderLayout;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    import javax.swing.JTextArea;
    import javax.swing.JTextPane;
    import java.awt.TextField;
     
     
    public class myframe extends JFrame {
     
    	/**
    	 * Launch the application.
    	 */
    	public static void main(String[] args) {
    		EventQueue.invokeLater(new Runnable() {
    			public void run() {
    				try {
    					myframe frame = new myframe();
    					frame.setVisible(true);
    				} catch (Exception e) {
    					e.printStackTrace();
    				}
    			}
    		});
    	}
     
    	/**
    	 * Create the frame.
    	 */
    	public myframe() {
    		setBounds(100, 100, 450, 300);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		getContentPane().setLayout(null);
     
    		JButton btnNewButton = new JButton("Video");
    		btnNewButton.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent arg0) {
    			}
    		});
    		btnNewButton.setBounds(10, 11, 105, 23);
    		getContentPane().add(btnNewButton);
     
    		JButton btnNewButton_1 = new JButton("Information");
    		btnNewButton.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent arg0) {
    			}
    		});
    		btnNewButton_1.setBounds(10, 45, 105, 23);
    		getContentPane().add(btnNewButton_1);
     
    		JButton btnNewButton_2 = new JButton("Generate");
    		btnNewButton.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent arg0) {
    			}
    		});
    		btnNewButton_2.setBounds(10, 174, 105, 23);
    		getContentPane().add(btnNewButton_2);
     
    		JTextPane textPane = new JTextPane();
    		textPane.setBounds(125, 174, 299, 23);
    		getContentPane().add(textPane);
     
    	}
    }

  7. #7
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    Default Re: Need help with some coding

    What are your questions or problems now?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with some coding

    Same questions... I want to run the compliment program using the "generate" button... and I want to display the output in the text pane next to it... simply put I don't know how to do it. the only syntax I know that displays output on the screen is "out.println" but that won't print the output in the text pane... at least I don't think it will. I want to know the syntax that designates the text pane as the area where I want the output printed.

  9. #9
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    Default Re: Need help with some coding

    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
    Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!

  10. #10
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    Default Re: Need help with some coding

    I apologize, but I'm just not getting it... I checked out the link you posted KevinWorkman, but I still can't find a way to do what I want to do. May it be because I'm approaching the program the wrong way?

    --- Update ---

    Oh! I just found something that may help me out. How do I redirect all "system" traffic to the jTextArea I have set up (i changed it from a jTextPane)? Like, when I type "system.out.println()" I want whatever it is to be printed in the jTextArea instead.

  11. #11
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    Default Re: Need help with some coding

    There is a method in the System class that will change the class of the out variable. You could change that to a class of yours that would append what was written to System.out to the text area.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with some coding

    Ok, I have System.setOut()... but what goes inside the parenthesis? I've tried "JTextPane", I've tried "JTextPane.class", I've tried "myframe.class". I just don't know the syntax required to say "this text pane in this class".

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    Default Re: Need help with some coding

    Quote Originally Posted by Firearrow5235 View Post
    Ok, I have System.setOut()... but what goes inside the parenthesis? I've tried "JTextPane", I've tried "JTextPane.class", I've tried "myframe.class". I just don't know the syntax required to say "this text pane in this class".
    You can't just guess at the syntax. What type of Object does that method take? Do you have that type of Object available?

    You should also think about other approaches: are you sure you want to redirect your System.out? Take a look at the API for JTextPane for methods that let you set the text. Could you use that instead?
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  14. #14
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    Default Re: Need help with some coding

    I don't know if I can use it... That's kinda why I'm here... I am an absolute beginner. I'm writing this program mainly as practice, and to find out what I need to learn.

    Here's my code so far...

    import static java.lang.System.out;
     
    import java.awt.EventQueue;
     
    import javax.swing.JFrame;
    import javax.swing.JButton;
    import java.awt.BorderLayout;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    import javax.swing.JTextArea;
    import javax.swing.JTextPane;
    import java.awt.TextField;
    import java.util.Random;
    import java.util.Random;
     
    public class myframe extends JFrame {
     
    	/**
    	 * Launch the application.
    	 */
    	public static void main(String[] args) {
    		EventQueue.invokeLater(new Runnable() {
    			public void run() {
    				try {
    					myframe frame = new myframe();
    					frame.setVisible(true);
    				} catch (Exception e) {
    					e.printStackTrace();
    				}
    			}
    		});
    	}
     
    	/**
    	 * Create the frame.
    	 */
    	public myframe() {
    		setBounds(100, 100, 450, 300);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		getContentPane().setLayout(null);
     
    		JButton btnNewButton = new JButton("Video");
    		btnNewButton.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent arg0) {
    			}
    		});
    		btnNewButton.setBounds(10, 11, 105, 23);
    		getContentPane().add(btnNewButton);
     
    		JButton btnNewButton_1 = new JButton("Information");
    		btnNewButton.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent arg0) {
    			}
    		});
    		btnNewButton_1.setBounds(10, 45, 105, 23);
    		getContentPane().add(btnNewButton_1);
     
    		JButton btnNewButton_2 = new JButton("Generate");
    		btnNewButton.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent arg0) {
    				myframe.compliment();
    			}
    		});
    		btnNewButton_2.setBounds(10, 174, 105, 23);
    		getContentPane().add(btnNewButton_2);
     
    		JTextPane textPane = new JTextPane();
    		textPane.setBounds(125, 174, 299, 23);
    		getContentPane().add(textPane);
     
    }
     
    protected static void compliment() {
    		// TODO Auto-generated method stub
    	Random myRandom = new Random();	
    	int randomNumber; {
     
     
    	randomNumber = myRandom .nextInt(10) + 1;
     
    	switch (randomNumber) {
    	case 1:
    		out.println("Insert comment here!");
    		break;
    	case 2:
    		out.println("Insert comment here!");
    		break;
    	case 3:
    		out.println("Insert comment here!");
    		break;
    	case 4:
    		out.println("Insert comment here!");
    		break;
    	case 5:
    		out.println("Insert comment here!");
    		break;
    	case 6:
    		out.println("Insert comment here!");
    		break;
    	case 7:
    		out.println("Insert comment here!");
    		break;
    	case 8:
    		out.println("Insert comment here!");
    		break;
    	case 9:
    		out.println("Insert comment here!");
    		break;
    	case 10:
    		out.println("Insert comment here!");
    		break;
    	default:
    		out.println("Insert comment here!");
    		break;
    	}
    	}
    	}
    }

    Tell me what I need to do to get what I want.

  15. #15
    Super Moderator Norm's Avatar
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    Default Re: Need help with some coding

    TextPanes are much more complicated than textfields. I'd change to a textfield.

    If you want to trap System.out.println() using setOut() you need to read the API doc for setOut() and find what type of arg it takes. Then you need to work on creating that type of arg.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with some coding

    Ahhh! Ok... so it takes a printstream... I know how to create a printstream but what ties that printstream to the text pane? Do I just have to create the printstream in the arguments "section" of the textpane's code?

  17. #17
    Super Moderator Norm's Avatar
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    Default Re: Need help with some coding

    The PrintStream class you create gets the String printed by the print/println methods.
    You can then append that String to the textarea.
    If you don't understand my answer, don't ignore it, ask a question.

  18. The Following User Says Thank You to Norm For This Useful Post:

    Firearrow5235 (April 13th, 2013)

  19. #18
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    Default Re: Need help with some coding

    OK... thank you for all your help!

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