Programa De Decimal a Binario

package array;
// traer paquetes de java
import java.io.*;
import javax.swing.*;

public class DECIMALABINARIO {
//el metodo main inicia

public static void main(String arg[]) throwsIOException {
String NumADividir;
String Resultado = "";
int bin[] = new int[100];
int size = 100,
posStart = -1;
int x = 0, temp;
NumADividir = JOptionPane.showInputDialog("Número entero aconvertir ? ");
// verifica que la cadena no sea mayor a 8 caracteres
if (NumADividir.length() = 0; x--) {
if (bin[x] == 1) {
posStart = x;
}
}
// forma la cadena final
for (x = posStart; x >= 0;x--) {
Resultado = Resultado + Integer.toString(bin[x]);
}
JOptionPane.showMessageDialog(null, "Binario: " + Resultado, "Resultados", JOptionPane.PLAIN_MESSAGE);
} else {JOptionPane.showMessageDialog(null, "La cantidad contiene más de 8 digitos", "Error !!!!", JOptionPane.PLAIN_MESSAGE);
}
System.exit(0);
//terminar aplicacion de la ventana
} //fin del metodo main} // fin de la clase}

package swing1;

/**
*
* @author James
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.io.*;

public class swing {public static void main (String[] args) {

JFrame frame = new JFrame("Computer Architecture Conversions");
frame.setVisible(true);
frame.setSize(500,500);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel panel = new JPanel ();
frame.add(panel);

JButton button = new JButton ("Binary to Decimal") ;
JButton button2 = new JButton ("Decimal to Binary");
JButtonbutton3 = new JButton ("Decimal to Hexadecimal");
JButton button4 = new JButton ("Hexadecimal to Decimal");
JButton button5 = new JButton ("Library of Boolean Algebra Rules");
JButton button6= new JButton ("1's Complement");
JButton button7 = new JButton ("2's Complement");
panel.add(button);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(button5);...