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Embed PApplet intp JApplet

How can I embed a PApplet into a JApplet ?
I wanted to add it to a JPanel inside the applet, but I couldn't.
If any of you know how I can do this. ??

As of Processing 3, you can no longer do this. PApplet no longer extends Applet, so it can't be treated as a component.
For 95% of users, this is okay. Applets are dead anyway, so you really shouldn't be using them. If at all possible, you should try deploying with Processing.js.
If you need to execute a Processing sketch from Java code, then you should use the PApplet.main("YourSketchNameHere"); function to launch it. Processing will take care of the window for you.
If you really need to treat a PApplet as a component, then you're going to have to go through its PSurface. The PSurface class contains a getNative() function that returns an object that can be treated as a component. But that's overkill for most Processing users.

Prior to Processing 3, this code should have worked for you as #Kevin has explained. So, if your question is directed towards understanding a legacy code here is what you will need to know:
import javax.swing.JFrame;
import javax.swing.JPanel;
class MyPApplet extends PApplet implements ActionListener{
#Override
public void setup() {
super.setup();
// setup
}
#Override
public void draw() {
// my draw code
}
}
public class PAppletDemo {
public static void main(String[] args) {
final JFrame frame = new JFrame("PApplet in Java Application");
JPanel panel = new JPanel();
//create an instance of your processing applet
final MyPApplet applet = new MyPApplet();
applet.init();
panel.add(applet); // From processing 3, this will give you error that applet is not a Component
frame.add(panel);
frame.setSize(applet.getSize().width, applet.getSize().height +200);
frame.setVisible(true);
}
}
To circumvent this, you will need to use PSurface getNative() function. Please refer to the example and discussion given on this link.

NetBeans 8.0.2 : form can't be main class

I made ​​a simple program input and data display connected to sql server 2008. Only one java class for connections (KoneksiDatabase.java) and one JFrame form for form (Form.Java). Previously I did not specify the main class for the project . after JFrame form completed I made why I could not make out the form as the main class ?
when I create a new form JFrame (Form2.java) form they will be made in the main class in the Project Properties
Form2.Java only seen in pictures that can be made in the main class , while Form.Java can not.
http://s.kaskus.id/images/2015/08/11/912158_20150811050000.jpg

Did you try something like this in your Form class?
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Form().setVisible(true);
}
});
}
or even more simpler
public static void main(String args[]) {
new Form().setVisible(true);
}

Method called in constructor is not working after built in java netbeans

Here while I run java project in netbeans all things are working okay. But after they are built there is not any item added in combobox as it works during netbeans run. The sample code is given below.
First Login JFrame
public class Login_Frame extends javax.swing.JFrame {
welcome w = new welcome();
public Login_Frame() {
initComponents();
}
//button action perform event for dispose this window and open new welcome window
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
.
.
w.setVisible(true);
this.dispose();
.
.
}
}
Second JFrame
public final class welcome extends javax.swing.JFrame {
// comboitem is class in which method for adding item in combobox from sqlite
db is declared
comboitem c = new comboitem();
// textclass is class in which method for changing lowercase text entered in
text to uppercase is declared
textclass tc = new textclass();
public welcome() {
// while I try to run the project using netbeans run project option
// logincall() method initialized and work fine.
Problem
After project built when I try to run the jar file from the cmd. it runs without any
error but logincall() method doesn't work or may be not initialized.
initComponents();
logincall();
.
.
}
public void logincall(){
//Remarks
//tc.uppercase() method is working fine after built. But other c.but_stn() like
// doen't.while during running project through netbeans all thing working fine.
c.bus_stn();
c.bus_trl();
c.inq_stn();
c.editframe();
c.userlist();
c.editTrainStation();
c.editFlightStation();
c.flightFlight();
c.pickupstand();
tc.uppercase();
}
I didn't know what is wrong with it. I searched on google but didn't find any proper answer.
There also any error showing up in netbeans. Please fill free to ask any questions if more information is needed. I appreciate all your replies.
This is my Welcome Main class's main method.
public static void main(String args[]) {
...
look and feel auto generated code
....
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new welcome().setVisible(true);
}
});
}

A couple of things that might be an issue here:
1) Are you running your GUI on the EventDispatchThread? this is mandatory for java swing GUI to be able to work properly. The main reason for this is concurrency. Details here.
2) Are you re-rendering your combobox? it is important that you do this because changes to GUI elements may not be immediately shown.
3) What Database are you using? in order to determine if the fault lies in the code or the DB you could write a test using static data, if it loads in the IDE and outside of it chances are that your code is correct but the DB isn't

combobox selection won't load/initialize class in a new window

SEE UPDATE AT THE BOTTOM!!
I've tried to figured out how to do this for a couple of days but so far I have had no luck.
Basically what I want to do is have a combobox, which when an option is selected loads an applet, and passes a value to the applet.
Here is the code for the ComboBox class, which is supposed to open the other class in a new window. The other class is the main class for an applet. They are both in the same project but in different packages. I know that there aren't any errors with the rest of the code.
//where I evaluate the selection and then open SteadyStateFusionDemo
// more selections just showing one code block
combo.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent ie){
String str = (String)combo.getSelectedItem();
if (str.equals("NSTX")) {
machine = "A";
JFrame frame = new JFrame ("MyPanel2");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
SteadyStateFusionDemo d = new SteadyStateFusionDemo();
frame.getContentPane().add (new SteadyStateFusionDemo());
d.init();
frame.pack();
frame.setVisible (true);
And just to cover everything here is the beginning of the init() method of SteadyStateFusionDemo as well as the main method in the class. Too much code to post otherwise. There are several different privates before the init method.
//method that initializes Applet or SteadyStateFusionDemo class
public void init() {
//main method of the SteadyStateFusionDemo class
public static void main (String[] args) {
JFrame frame = new JFrame ("MyPanel");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new SteadyStateFusionDemo());
frame.pack();
frame.setVisible (true);
What am I doing wrong? Why doesn't my class load?
UPDATED: Changed the code so that a JFrame opens and then the JApplet loads inside. I have successfully done this in a test Java applet but for some odd reason it won't work with this Applet. I even set up the test in a similar way (The code for this is virtually the same, except with different class names, and of course a much, much shorter init() method). Can someone help me figure out why this isn't working? Also, a JFrame will open if I delete the lines referring to SteadyStateFusionDemo, but once I reference it won't work. Why does this happen?

UPDATE:
Based on your feedback, it seems you are trying to achieve the following:
Use the code of an existing Applet (found here) in a Desktop application (i.e. in a JFrame).
Converting an Applet to a Desktop application is an "undertakable" task, the complexity of which depends on how much "Applet-specific" stuff is used by the Applet. It can be as simple as creating a JFrame and adding myFrame.setContentPane(new myApplet().getContentPane()); or as complex as...hell.
This tutorial might be a good place to start.
After taking a look at the Applet at hand, it seems to be fairly easy to convert it. The only complicating factor is the use Applet's methods getCodeBase() and getImage(URL) (somewhere in the code). These two methods result in a NullPointerException if the Applet is not deployed as...an Applet.
So, what you can do is override those two methods in order to return the intended values (without the exception). The code could look like this:
/* Import the necessary Applet entry-point */
import ssfd.SteadyStateFusionDemo;
/* Subclass SSFD to override "problematic" methods */
SteadyStateFusionDemo ssfd = new SteadyStateFusionDemo() {
#Override
public URL getCodeBase() {
/* We don't care about the code-base any more */
return null;
}
#Override
public Image getImage(URL codeBase, String imgPath) {
/* Load and return the specified image */
return Toolkit.getDefaultToolkit().getImage(
this.getClass().getResource("/" + imgPath));
}
};
ssfd.init();
/* Create a JFrame and set the Applet as its ContentPane */
JFrame frame = new JFrame();
frame.setContentPane(ssfd);
/* Configure and show the JFrame */
...
The complete code for an example JFrame Class can be found here.
Of course, you need to have all Classes from the original Applet accessible to your new Class (e.g. put the original Applet in your classpath).

What is an advisable design pattern for switching between GUI pages?

What I don't like about my code below is:
getters are needed for every JButton on each page
the actionPerformed method can quickly become bloated with if-else statements
So, is there a better way to control all GUI actions from a single class?
If I define an actionPerformed method within each respective page (JPanel), each page will need access to instances of the page(s) switched to, and I am trying to avoid using the Singleton pattern for each page...
Here is the code:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
*
* #author Ian A. Campbell
*
*/
public class Controller implements ActionListener {
/**
* instance variables:
*/
private Frame frame;
private OptionPage firstPage;
private FirstOptionPage firstOption;
private SecondOptionPage secondOption;
/**
*
*/
public Controller() {
// instantiating the frame here:
this.frame = new Frame();
/*
* instantiating all pages here:
*
* NOTE: passing "this" because this class
* handles the events from these pages
*/
this.firstPage = new OptionPage(this);
this.firstOption = new FirstOptionPage(this);
this.secondOption = new SecondOptionPage(this);
}
/**
*
*/
public void start() {
this.frame.add(this.firstPage); // adding the first page
// NOTE: these lines prevent blank loading and flickering pages!
this.frame.validate();
this.frame.repaint();
this.frame.setVisible(true);
}
/**
*
* #return the JFrame instantiated from the class Frame
*/
public Frame getFrame() {
return this.frame;
}
#Override
public void actionPerformed(ActionEvent e) {
// the "first option" button from the OptionPage:
if (e.getSource() == this.firstPage.getFirstButton()) {
this.frame.getContentPane().removeAll();
this.frame.getContentPane().add(this.firstOption);
// the "second option" button from the OptionPage:
} else if (e.getSource() == this.firstPage.getSecondButton()) {
this.frame.getContentPane().removeAll();
this.frame.getContentPane().add(this.secondOption);
}
// NOTE: these lines prevent blank loading and flickering pages!
this.frame.validate();
this.frame.repaint();
this.frame.setVisible(true);
}
} // end of Controller

Use a Card Layout. Card Layout Actions adds some extra features that you might find helpful.

You could use card layout, or you could get creative and remove elements. For instance:
panel.remove((JButton)myButton1)); // Remove all of the elements...
panel.add((JButton)myButton2)); // Add the new elements
Of course I wouldn't deal with the java built in GUI at all, IMO the layout designs are horrific. I would much rather use something like "A New Look and Feel" -- http://www.javootoo.com/.