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September 7, 2009 at 4:14 PM

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1)Prime and Palindrome:

import java.util.*;

public class PrimeAndPalindrome {

static final int MAXNUMBER=500;

private int number;

private ArrayList<Integer> list = new ArrayList<Integer>();

public PrimeAndPalindrome(int maxNum){

number=maxNum;

}

ArrayList<Integer> isPalindrome(){

for (int i=10; i<=number; i++){

Integer in=new Integer(i);

String number=in.toString();

int index1=0;

int index2=number.length()-1;

char x=number.charAt(index1);

char y=number.charAt(index2);

while (index2-index1>=0){

if(x!=y)

break;

if (index2-index1==0 || index2-index1==1)

list.add(i);

index1++;

index2--;

x=number.charAt(index1);

y=number.charAt(index2);

}

}

return list;

}

static boolean isPrime(int number){

boolean isPrime=false;

int i=(int) Math.ceil(Math.sqrt(number));

while (i>1){

if ((number!=i) && (number%i==0)){

isPrime=false;

break;

}

else if (!isPrime)

isPrime=true;

--i;

}

return isPrime;

}

public static void main(String[] args) {

ArrayList<Integer> palindromes=new ArrayList<Integer>();

PrimeAndPalindrome pp=new PrimeAndPalindrome(MAXNUMBER);

palindromes=pp.isPalindrome();

Iterator<Integer> iter=palindromes.iterator();

while (iter.hasNext()){

int current=iter.next();

if (isPrime(current))

System.out.println(current);

}

}

}

1)Prime and Palindrome:

import java.util.*;

public class PrimeAndPalindrome {

static final int MAXNUMBER=500;

private int number;

private ArrayList<Integer> list = new ArrayList<Integer>();

public PrimeAndPalindrome(int maxNum){

number=maxNum;

}

ArrayList<Integer> isPalindrome(){

for (int i=10; i<=number; i++){

Integer in=new Integer(i);

String number=in.toString();

int index1=0;

int index2=number.length()-1;

char x=number.charAt(index1);

char y=number.charAt(index2);

while (index2-index1>=0){

if(x!=y)

break;

if (index2-index1==0 || index2-index1==1)

list.add(i);

index1++;

index2--;

x=number.charAt(index1);

y=number.charAt(index2);

}

}

return list;

}

static boolean isPrime(int number){

boolean isPrime=false;

int i=(int) Math.ceil(Math.sqrt(number));

while (i>1){

if ((number!=i) && (number%i==0)){

isPrime=false;

break;

}

else if (!isPrime)

isPrime=true;

--i;

}

return isPrime;

}

public static void main(String[] args) {

ArrayList<Integer> palindromes=new ArrayList<Integer>();

PrimeAndPalindrome pp=new PrimeAndPalindrome(MAXNUMBER);

palindromes=pp.isPalindrome();

Iterator<Integer> iter=palindromes.iterator();

while (iter.hasNext()){

int current=iter.next();

if (isPrime(current))

System.out.println(current);

}

}

}

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