Java SE (Java Platform, Standard Edition)

Hello everyone,

I have a program that supposed to open a Swing window and create three tabs for calculating Factorials, Permutations, and Combinations.

Once you click on one of those tabs, text boxes and a button will appear. You type in the numbers, and it will give the desired calculations for you.

I compiled this program and it was successful, but when I tried to run it, I got this error message:

Exception in thread "main" java.lang.IllegalArgumentException: adding container'
s parent to itself
at java.awt.Container.addImpl(Container.java:1017)
at java.awt.Container.add(Container.java:903)
at newFactorialsGUI.<init>(newFactorialsGUI.java:40)
at newFactorialsGUI.createAndShowGUI(newFactorialsGUI.java:50)
at newFactorialsGUI.main(newFactorialsGUI.java:172)

I am probably making some painfully obvious and stupid mistake; but please excuse me, I am fairly new to Java.

If anybody can tell me what I did wrong and how I can fix so, that would be great. Thank you (and please excuse the bizarre variable and constructor names).

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.JOptionPane;
import javax.swing.JDialog;
import javax.swing.JButton;
import javax.swing.JRadioButton;
import javax.swing.JComponent;
import javax.swing.ButtonGroup;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.BoxLayout;
import javax.swing.Box;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import javax.swing.JTabbedPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.SwingUtilities.*;
import java.beans.*;

public class newFactorialsGUI extends JFrame
{
	JLabel informationarea;
	JFrame frame;
	String heading1 = "Enter the number that goes before the ! now:";
	String heading2 = "Enter the numbers that go before and after the P now:";
	String heading3 = "Enter the numbers that go before and after the C now:";
	public newFactorialsGUI(JFrame frame)
	{
		this.frame = frame;
		informationarea = new JLabel("Select a tab, then enter the numbers and this program will calculate it for you.", JLabel.CENTER);
		Border padding = BorderFactory.createEmptyBorder(20,20,5,20);
		JPanel allincommonpanel = new JPanel();
		allincommonpanel.setBorder(padding);
		JTabbedPane Cardamon = new JTabbedPane();
		Cardamon.addTab("Factorials", null, allincommonpanel, heading1);
		Cardamon.addTab("Permutations", null, allincommonpanel, heading2);
		Cardamon.addTab("Combinations", null, allincommonpanel, heading3);
		allincommonpanel.add(Cardamon, BorderLayout.CENTER);
		allincommonpanel.add(informationarea, BorderLayout.PAGE_END);
		informationarea.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
		createFactorialBox();
		createPermutationBox();
		createCombinationBox();
	}
	public static void createAndShowGUI()
	{
		JFrame frame = new JFrame("Factorials, Permutations, and Combinations Calculator");
		new newFactorialsGUI(frame);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
	public int factorialize(int inputfactorial)
	{
		int factorialfinale = 1;
		int factorialengine;
		for (factorialengine = inputfactorial; factorialengine >= 1; factorialengine--)
		{
			factorialfinale *= factorialengine;
		}
		return factorialfinale;
	}
	public int permutationize(int inputpermutation1, int inputpermutation2)
	{
		int permutationsfinale = 1;
		int rununtil;
		rununtil = inputpermutation1 - inputpermutation2;
		rununtil++;
		int permutationsengine;
		for (permutationsengine = inputpermutation1; permutationsengine >= rununtil; permutationsengine--)
		{
			permutationsfinale *= permutationsengine;
		}
		return permutationsfinale;
	}
	public int combinationize(int inputcombination1, int inputcombination2)
	{
		int combinationsqualify = 1;
		int rununtil;
		rununtil = inputcombination1 - inputcombination2;
		rununtil++;
		int comboengine1;
		int combinationsqualify1 = 1;
		for (comboengine1 = inputcombination1; comboengine1 >= rununtil; comboengine1--)
		{
			combinationsqualify1 *= comboengine1;
		}
		int comboengine2;
		int combinationsqualify2 = 1;
		for (comboengine2 = inputcombination2; comboengine2 >= 1; comboengine2--)
		{
			combinationsqualify2 *= comboengine2;
		}
		int combinationsfinale = combinationsqualify1 / combinationsqualify2;
		return combinationsfinale;
	}
	void setLabel(String newtxt)
	{
		informationarea.setText(newtxt);
	}
	private void createFactorialBox()
	{
		JPanel controlpanel2 = new JPanel();
		controlpanel2.setLayout(new BorderLayout());
		final JTextField input = new JTextField(15);
		JButton buttonOK = new JButton("Calculate");
		controlpanel2.add(input);
		controlpanel2.add(buttonOK);
		buttonOK.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				String rawinput = input.getText();
				int finalinput = Integer.parseInt(rawinput);
				int answerfinale =  factorialize(finalinput);
				setLabel("The answer to your factorial problem is: " + answerfinale);
			}
		}
		);
	}
	private void createPermutationBox()
	{
		JPanel controlpanel1 = new JPanel();
		controlpanel1.setLayout(new BorderLayout());
		final JTextField input1 = new JTextField(15);
		final JTextField input2 = new JTextField(15);
		JButton buttonOK = new JButton("Calculate");
		controlpanel1.add(input1);
		controlpanel1.add(input2);
		controlpanel1.add(buttonOK);
		buttonOK.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				String rawinput1 = input1.getText();
				int finalinput1 = Integer.parseInt(rawinput1);
				String rawinput2 = input2.getText();
				int finalinput2 = Integer.parseInt(rawinput2);
				int answerfinale = permutationize(finalinput1, finalinput2);
				setLabel("The answer to your permutation problem is: " + answerfinale);
			}
		}
		);
	}
	private void createCombinationBox()
	{
		JPanel controlpanel3 = new JPanel();
		controlpanel3.setLayout(new BorderLayout());
		final JTextField input1 = new JTextField(15);
		final JTextField input2 = new JTextField(15);
		JButton buttonOK = new JButton("Calculate");
		controlpanel3.add(input1);
		controlpanel3.add(input2);
		controlpanel3.add(buttonOK);
		buttonOK.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				String rawinput1 = input1.getText();
				int finalinput1 = Integer.parseInt(rawinput1);
				String rawinput2 = input2.getText();
				int finalinput2 = Integer.parseInt(rawinput2);
				int answerfinale = combinationize(finalinput1, finalinput2);
				setLabel("The answer to your combination problem is: " + answerfinale);
			}
		}
		);
	}
	public static void main(String[] args)
	{
		createAndShowGUI();
	}
}