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/** * @(#)PrimeNumberCheck.java * * PrimeNumberCheck application * * @author Eric Carr * @version 0.8a 2008/3/27 */ import javax.swing.JOptionPane;public class PrimeNumberCheck {    public static String userQuestion;    public static int userNumber = 0;    public static void main(String[] args) {    System.out.println("This Program checks whether a number is prime.\nPlease input your number.");    userQuestion = JOptionPane.showInputDialog(null, "Enter your number so it's primality may be checked.");    try {    	userNumber = Integer.parseInt(userQuestion);    }    catch (NumberFormatException userGivenNumberPrimeCheckNumFormatEx) {    	System.err.println("You did not enter a number, you entered" + userQuestion + ".");    	throw userGivenNumberPrimeCheckNumFormatEx;    }    if (userNumber != 0) {    if (primeChecker.isPrime(userNumber) == true) {    	System.out.println(userNumber + " is prime.");    }    else {    	System.out.println(userNumber + " is not prime.");    }    }        }          }   //External Class primeCheckerpublic class primeChecker {		  public static boolean isPrime(int x) {    int a = 3; //Used to check whether number is prime    	if ((((Math.pow(a, x))-a)/x) == Math.round(((Math.pow(a, x))-a)/x)) {     	    		return true;    		    	}    	else {    		return false;    	}    	}}