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POswing component not visible
 

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    <p>I am working on an application and I am stuck in the incipient phase. I have a <code>JTextField</code> in a <code>JPanel</code> in a <code>JFrame</code>. <code>JTextField</code> isn't there. If I use</p> <pre><code>JPanel p0 = (JPanel) f.getContentPane(); </code></pre> <p>it works. But Not with</p> <pre><code>JPanel p0 = new JPanel(); f.add(p0); </code></pre> <p>So the problems are:</p> <ol> <li>Why is not the field visible? (most important q)</li> <li>What's the difference between the 2 aforementioned approaches?</li> </ol> <p>Code:</p> <pre><code>import java.awt.*; import java.io.*; import java.net.*; import java.util.*; import javax.swing.*; public class Main { static Font fontDefault = new Font("arial", Font.PLAIN, 15); public static void main ( String [ ] args ) { JFrame f = new JFrame("Liquid"); f.setSize(new Dimension(840, 400)); //f.setIconImage(image); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //JPanel p0 = (JPanel) f.getContentPane();// is it necessary? JPanel p0 = new JPanel(); p0.setLayout(null); JPanel p1 = new JPanel(); p1.setLayout(null); JTextField tfHostName = new JTextField("default text", 20); tfHostName.setBounds(50, 50, 200, 25); tfHostName.setFont(fontDefault); JButton bRequest = new JButton("request"); JButton bReset = new JButton("reset"); JTextArea taTest = new JTextArea("default text", 1, 20); p0.add(tfHostName); f.add(p0); f.add(p1); p0.add(taTest); //f.pack(); f.setResizable(false); f.setVisible(true); } } </code></pre> <p>As a reminder:</p> <p>It works with <code>JPanel p0 = (JPanel) f.getContentPane();</code> but why id doesn't with 2nd approach, which I'm more comfortable with? Plus, that way how do I add a second panel and how do I make components in each panel auto-arranged?</p> <p>Update:</p> <p>I realized that the code didn't work in the first place probably because I didn't specified any coordinates/position?...</p>
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    1. USmireazma
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    1. COfor better help sooner post an [SSCCE](http://sscce.org/), short, runnable, compilable about JPanel p0 = new JPanel(); f.add(p0);
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    2. COEDITED. Added code. I wanted to do this in the first place but it wouldn't let me, saying the question is not good by their standards...
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    3. CO`What's the difference between the 2 aforementioned approaches?` - the first approach uses the default layot manger. The second approach doesn't use a layout manager. Don't use a null layout!!! Don't use setBounds()!!! Why do beginners always play with a null layout and then complain when it doesn't work? All the example code we post in this forum uses a layout manager. Where do you get this code that shows you to use a null layout? My advice is to ignore that website.
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      1. UScamickr
 

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