Applets alignment. cache & POST

[Carsten Rasmussen]

I want to know howto align my radio buttons at center bottom.
I also want to know howto POST from Java Applet to a PHP page.
Last i want to know howto make an applet stop caching so you don't have to close browser to see new content.
Can anybody help ???

Here is my applet code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.BorderLayout;

public class panel extends JApplet implements ActionListener {
	JTextField tf    = new JTextField("", 30);
	JButton bot      = new JButton("Send");
	JRadioButton cb1 = new JRadioButton("none", true);
	JRadioButton cb2 = new JRadioButton("b", false);	
	JRadioButton cb3 = new JRadioButton("i", false);
	JRadioButton cb4 = new JRadioButton("u", false);
	ButtonGroup g    = new ButtonGroup();
		
	public void init() {			
			Container content = getContentPane();
			content.setBackground(Color.white);
			content.setLayout(new FlowLayout()); 

			g.add(cb1);
			g.add(cb2);
			g.add(cb3);
			g.add(cb4);
			
			content.add(tf);
			content.add(bot);
			content.add(cb1);
			content.add(cb2);
			content.add(cb3);
			content.add(cb4);
			
			bot.addActionListener(this);
		}
		
	public void actionPerformed(ActionEvent e) {
			if ( e.getSource() == bot ) {

				}
		}
	}

I'm new at Java Applets so i properly wont be able to understand unless you keep it simple.
Thanks in advanced.

Carsten S. Rasmussen

[Paul Clapham]

Carsten Rasmussen wrote:I want to know howto align my radio buttons at center bottom.

Well, this question isn't specific to applets, it's a general Swing question. The short answer is that you use a suitable layout manager, or combination of layout managers. Here's a link to the Oracle tutorial about layout managers: http://download.oracle.com/javase/tutorial/uiswing/layout/index.html.

I also want to know howto POST from Java Applet to a PHP page.

Likewise this question isn't specific to applets, it can be asked about any Java application which needs to connect to a server. Here's a link to an Oracle tutorial about connecting to URLs and sending and receiving data: http://download.oracle.com/javase/tutorial/networking/urls/index.html. The only applet-related thing is the applet methods getCodeBase() and getDocumentBase() which might help you find your way back to the server from which the applet was downloaded.

Last i want to know howto make an applet stop caching so you don't have to close browser to see new content.

Go to the Java control panel. Select the General tab and click the Settings... button in the Temporary Internet Files section. You will see a Delete Files... button in the popup window, click that and choose the appropriate option from its popup.

You'll notice I linked to several tutorials. Since you're new, the best way to learn about particular topics in Java is to work your way through a tutorial. Work with the code in the tutorial and modify it to do something more like what you want to do, rather than just trying to write code from nothing.

[Carsten Rasmussen]

I want to know how to align my textfield and buttons so far i have manage to make this:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.applet.*;

public class post extends JApplet 
{
	JTextField field = new JTextField("", 20);
	String bot_text = " Click me :) ";
	JButton bot = new JButton(bot_text);

	public void init() 
	{
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    createGUI();
                }
            });
        } catch (Exception e) { 
            System.err.println("createGUI didn't complete successfully");
        }

	}


	public void createGUI() {
		Container content = getContentPane();
		content.setBackground(Color.white);
		content.setLayout(new FlowLayout(FlowLayout.LEFT));

		content.add(field);
		content.add(bot);

		bot.addActionListener(new ActionListener()
        {
            public void actionPerformed (ActionEvent e)
            {
                String field_text = field.getText();
				if ( field_text.equals("is Carsten god?") == true )
				{
				bot.setText("GO GO GO!!!");
				} else { bot.setText(bot_text); }
            }
        });
	}
}

As you can see my button and textfield are align to the left but what if i want to align the button at bottom and textfield at top.
This time i want to see some codes, thank you
your regards Carsten

Ps. this is one of my first java scripts
PPS. i know how to google, i really want to learn ill be your student if possible
PPP: I tried turning off caching on JAVA på i still have to reopen browser to see new content

[Andrew Thompson]

Carsten Rasmussen wrote:I want to know how to align my textfield and buttons so far i have manage to make this:

As you can see my button and textfield are align to the left but what if i want to align the button at bottom and textfield at top.

This requirement does not match up with your earlier description about centering radio buttons - since it includes no radio buttons.

Carsten Rasmussen wrote:This time i want to see some codes, thank you

I want a pony. Thanks.

Another way to put that is that you do not always get what you want. The earlier post provided some excellent links that should have been sufficient to solve this problem. *

Carsten Rasmussen wrote:Ps. this is one of my first java scripts

Please refrain from using the term 'scripts' when referring to Java. It is not a scripting language, and the association of 'Java' and 'script' is too often confused with the separate language 'JavaScript'.


* The previous reply was aiming to teach you to fish. OTOH I am willing to 'toss you a fish'. You might think this is more useful, but I feel the first post had far better long term value.

This code puts some radio buttons in the bottom of the applet's content area, centered, as well as the two other controls at the top of the applet, aligned left.

To compile and run it, try something like:

prompt> javac post.java
prompt> appletviewer post.java

Carsten Rasmussen wrote:PPP: I tried turning off caching on JAVA på i still have to reopen browser to see new content

Those commands will open the applet in the JDK applet viewer. Since the applet viewer does not cache classes, it is a much better development tool than using an actual browser to check changes.

/*
<applet code="post" width="400" height="400">
</applet>
*/
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.applet.*;

public class post extends JApplet {

	JTextField field = new JTextField("", 20);
	String bot_text = " Click me :) ";
	JButton bot = new JButton(bot_text);

	public void init() {
		try {
			SwingUtilities.invokeAndWait(new Runnable() {
				public void run() {
					createGUI();
				}
			});
		} catch (Exception e) {
			System.err.println("createGUI didn't complete successfully");
			// when things go this badly, it is best to dump the stack trace
			e.printStackTrace();
			// not only is this less typing than what you the System.err.println(),
			// it is also more informative.
		}
	}

	public void createGUI() {
		//use a nested layout.E.G.
		JPanel controls = new JPanel(new FlowLayout(FlowLayout.LEFT));
		JPanel mainUI = new JPanel(new BorderLayout());

		controls.add(field);
		controls.add(bot);

		mainUI.add(controls, BorderLayout.NORTH);

		JPanel radioButtons = new JPanel(new FlowLayout(FlowLayout.CENTER));
		JRadioButton a = new JRadioButton("A");
		radioButtons.add(a);
		JRadioButton b = new JRadioButton("B");
		radioButtons.add(b);

		mainUI.add(radioButtons, BorderLayout.SOUTH);

		setContentPane(mainUI);

		bot.addActionListener(new ActionListener() {
			public void actionPerformed (ActionEvent e) {
				String field_text = field.getText();
				// the '==true' part is redundant.
				if ( field_text.equals("is Carsten god?") == true ) {
					bot.setText("GO GO GO!!!");
				} else {
					bot.setText(bot_text);
				}
			}
		});
	}
}

And before I forget. Please choose one form of the two common forms of delimiting code blocks and stick with it. E.G.

class HelloWorld {  // open bracket at end of previous line
}

class HelloWorld 
{  // open bracket aligned with close bracket
}