Quick Question

Newbie & Debugging Questions
#1

Hello All,

I’m in the process of making a GUI for a program that I wrote. What I want to do is take the character string that the user types into the text field and use it in main() like a regular string. Excuse me if this problem has been addressed in the past.

Here is my GUI thus far: Thanks to all those who respond.



import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import javax.swing.*;


public class GUITest extends JFrame {
	
	private String text;
	private static String filename;

	public GUITest() {
		
		super("LaTeX Template.exe");
		setSize(300,300);
		FlowLayout flo = new FlowLayout();
		setLayout(flo);
		JLabel Title = new JLabel("Doc Title:", JLabel.RIGHT);
		add(Title);
		JTextField text = new JTextField(20);
		add(text);
		JButton Create = new JButton("Create!");
		add(Create);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
		
	}
	
	public void actionPerformed(ActionEvent event) {
        String command = event.getActionCommand();
        if (command.equals("Create!")) {
        	filename = "Hello";
        }
	}
	
	public static void main(String args[]) {
		
		GUITest Temp = new GUITest();
		if (filename != null) {
			System.out.print(filename);
		}
	}
	
}
#2

Ok, I did a little research online and I now believe the code does almost everything I need it to. The only problem is that when I run the program it doesn’t wait for the user to enter values and the resulting fields end null when they shouldn’t be. How can I make the program wait on the user?

Thanks All,

Updated Code:



import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;


public class GUITest extends JFrame {
	
	private JTextField item1;
	
	public GUITest() {
		super("LaTeX Template");
		setLayout(new FlowLayout());
		
		item1 = new JTextField(10);
		add(item1);
		
		thehandler handler = new thehandler();
		item1.addActionListener(handler);
		
	}
	
	private class thehandler implements ActionListener {
		public void actionPerformed(ActionEvent event) {
		
			if(event.getSource() == item1) {
				TemplateCreator.filename = String.format("%s", event.getActionCommand());
				System.out.println(TemplateCreator.filename);
			}
		}
	}
	
}
#3

Haha, I’ve found a real Getto way to solve this problem.



try {
	do {
		Thread.sleep(100);
	} while(filename == null);
}
catch(Exception e) {}

Does anyone know of a method that will do this for me?

#4

Put the stuff you want to happen into functions then have the GUI events run your functions.

#5

Your problem is one of “flow” control…


import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class GUITest2 extends JFrame implements ActionListener {
  private static JTextField textField = new JTextField(20);

  public GUITest2() {
    super("LaTeX Template.exe");
    setSize(300, 300);
    FlowLayout flo = new FlowLayout();
    setLayout(flo);
    JLabel label = new JLabel("Doc Title:", JLabel.RIGHT);
    add(label);
    add(textField);
    JButton button = new JButton("Create!");
    button.addActionListener(this);
    add(button);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
  }

  public void actionPerformed(ActionEvent event) {
    display(readTextField());
  }

  private String readTextField() {
    return textField.getText();
  }

  private void display(String s) {
    System.out.println("user typed in "+s);
  }

  public static void main(String args[]) {
    new GUITest2();
  }
}