Programming Forums > Application Development > Java

Krista · Dec 5th, 2005, 1:07 PM

I am writing a program which takes user input from a JTextField and I need to use that field when calling a method. I get an error similar to the following.
required: java.lang.String
found: javax.swing.JTextField

My question is: how do I convert that JTextField into a string so I can use it in my method call?

Sorry that I don't have the actual code or error, but I am at work and don't have it with me. If you need further information I can post it once I get home.

Thanks.
Krista

medamaybe · Dec 5th, 2005, 1:26 PM

(Toggle Plain Text)

String theText = textField.getText ();

is that what you mean?

Krista · Dec 5th, 2005, 1:28 PM

I will give it a try and see what happens.

Thanks.

Krista · Dec 5th, 2005, 4:36 PM

I think that last snippet of code may have done something, as I am getting no errors along those lines.
Everything has compiled without any errors, but when I run and type in a url, it bypasses the method and goes to the catch block. It seems like I am passing nothing to the method.
Can someone have a look and see if I am missing something.

Assign3 class

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import java.awt.*;
import java.io.*;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;


public class Assign3 extends JFrame
{
	private JButton scrape;
	private JTextField site;
	private String url;
	
	public Assign3()
	{
		super("Scrape This Site");
		setLayout(new FlowLayout());
		
		site = new JTextField(20);
		add(site);
		
		scrape = new JButton("Scrape Site");
		add(scrape);
		
			
		ButtonHandler handler = new ButtonHandler();
		scrape.addActionListener(handler);
		
	}
		
	
	private class ButtonHandler implements ActionListener
	{
						
		String string = site.getText();
		//System.out.println(string);
		
		public void actionPerformed( ActionEvent event )
		
		{			
			Scrape scrapeSite = new Scrape();
			scrapeSite.getData(string);
		}
	}
		
	
}

Assign3Test class

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import javax.swing.JFrame;
public class Assign3Test

{
	public static void main(String args[])
	{
	
		Assign3 assign3 = new Assign3();
		assign3.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		assign3.setSize(275,110);
		assign3.setVisible(true);
	}
}

Scrape class(contains the method to scrape the data and the catch block)

(Toggle Plain Text)

import java.awt.*;
import java.io.*;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.net.*;
import java.util.Formatter;

public class Scrape
{	
	private Formatter file;
	private String site;
	
	public void getData(String url)
	{
		String site = url;
				
		try
		{
			file = new Formatter("scrapedData.txt");
			String data;
			BufferedReader reader;
			BufferedWriter writer;
				
			
			Socket socket = new Socket(site, 80);
			
			reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			
			writer.write("GET / HTTP/1.0\n\n");
			writer.flush();
			
			while((data = reader.readLine()) != null)
			{
				file.format("%s", data);
			}
			
		  }
			
		catch (IOException e)
		{
			System.out.println("There was an IOException Error!");
		
		}
	}
}

Polyphemus_ · Dec 5th, 2005, 4:58 PM

What do you see when you print out the actual exception message?

Krista · Dec 5th, 2005, 5:08 PM

When I run the code, the GUI pops up, I am able to type in the text field and press the button. It takes a moment and then the message 'There was an IOException' comes up...then press and key to continue.
The message is what I have put in my catch block, so it seems as though it's not taking the variable into consideration...or perhaps there's no variable being sent. I don't know.

Dec 5th, 2005, 1:07 PM	#1
Krista Newbie Join Date: Oct 2005 Posts: 12 Rep Power: 0	converting from javax.swing.JTextField to java.lang.String I am writing a program which takes user input from a JTextField and I need to use that field when calling a method. I get an error similar to the following. required: java.lang.String found: javax.swing.JTextField My question is: how do I convert that JTextField into a string so I can use it in my method call? Sorry that I don't have the actual code or error, but I am at work and don't have it with me. If you need further information I can post it once I get home. Thanks. Krista

Dec 5th, 2005, 1:26 PM	#2
medamaybe Newbie Join Date: May 2005 Location: the netherlands Posts: 11 Rep Power: 0	(Toggle Plain Text) String theText = textField.getText (); String theText = textField.getText (); is that what you mean?

Dec 5th, 2005, 4:36 PM	#4
Krista Newbie Join Date: Oct 2005 Posts: 12 Rep Power: 0	method won't recognize variable passed to it I think that last snippet of code may have done something, as I am getting no errors along those lines. Everything has compiled without any errors, but when I run and type in a url, it bypasses the method and goes to the catch block. It seems like I am passing nothing to the method. Can someone have a look and see if I am missing something. Assign3 class (Toggle Plain Text) import java.awt.; import java.io.; import java.awt.FlowLayout; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.JTextField; public class Assign3 extends JFrame { private JButton scrape; private JTextField site; private String url; public Assign3() { super("Scrape This Site"); setLayout(new FlowLayout()); site = new JTextField(20); add(site); scrape = new JButton("Scrape Site"); add(scrape); ButtonHandler handler = new ButtonHandler(); scrape.addActionListener(handler); } private class ButtonHandler implements ActionListener { String string = site.getText(); //System.out.println(string); public void actionPerformed( ActionEvent event ) { Scrape scrapeSite = new Scrape(); scrapeSite.getData(string); } } } import java.awt.; import java.io.; import java.awt.FlowLayout; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.JTextField; public class Assign3 extends JFrame { private JButton scrape; private JTextField site; private String url; public Assign3() { super("Scrape This Site"); setLayout(new FlowLayout()); site = new JTextField(20); add(site); scrape = new JButton("Scrape Site"); add(scrape); ButtonHandler handler = new ButtonHandler(); scrape.addActionListener(handler); } private class ButtonHandler implements ActionListener { String string = site.getText(); //System.out.println(string); public void actionPerformed( ActionEvent event ) { Scrape scrapeSite = new Scrape(); scrapeSite.getData(string); } } } Assign3Test class (Toggle Plain Text) import javax.swing.JFrame; public class Assign3Test { public static void main(String args[]) { Assign3 assign3 = new Assign3(); assign3.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); assign3.setSize(275,110); assign3.setVisible(true); } } import javax.swing.JFrame; public class Assign3Test { public static void main(String args[]) { Assign3 assign3 = new Assign3(); assign3.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); assign3.setSize(275,110); assign3.setVisible(true); } } Scrape class(contains the method to scrape the data and the catch block) (Toggle Plain Text) import java.awt.; import java.io.; import java.awt.FlowLayout; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.JTextField; import java.net.; import java.util.Formatter; public class Scrape { private Formatter file; private String site; public void getData(String url) { String site = url; try { file = new Formatter("scrapedData.txt"); String data; BufferedReader reader; BufferedWriter writer; Socket socket = new Socket(site, 80); reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); writer.write("GET / HTTP/1.0\n\n"); writer.flush(); while((data = reader.readLine()) != null) { file.format("%s", data); } } catch (IOException e) { System.out.println("There was an IOException Error!"); } } } import java.awt.; import java.io.; import java.awt.FlowLayout; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.JTextField; import java.net.; import java.util.Formatter; public class Scrape { private Formatter file; private String site; public void getData(String url) { String site = url; try { file = new Formatter("scrapedData.txt"); String data; BufferedReader reader; BufferedWriter writer; Socket socket = new Socket(site, 80); reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); writer.write("GET / HTTP/1.0\n\n"); writer.flush(); while((data = reader.readLine()) != null) { file.format("%s", data); } } catch (IOException e) { System.out.println("There was an IOException Error!"); } } } Last edited by Krista; Dec 5th, 2005 at 4:47 PM. Reason: change of topic

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Dec 5th, 2005, 1:28 PM	#3
Krista Newbie Join Date: Oct 2005 Posts: 12 Rep Power: 0	I will give it a try and see what happens. Thanks.

Dec 5th, 2005, 4:58 PM	#5
Polyphemus_ Expert Programmer Join Date: Aug 2005 Location: Rotterdam, the Netherlands Posts: 942 Rep Power: 4	What do you see when you print out the actual exception message?

Dec 5th, 2005, 5:08 PM	#6
Krista Newbie Join Date: Oct 2005 Posts: 12 Rep Power: 0	When I run the code, the GUI pops up, I am able to type in the text field and press the button. It takes a moment and then the message 'There was an IOException' comes up...then press and key to continue. The message is what I have put in my catch block, so it seems as though it's not taking the variable into consideration...or perhaps there's no variable being sent. I don't know.

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Programming Forums > Application Development > Java

converting from javax.swing.JTextField to java.lang.String