Capitalize a Word

package exam;

import java.util.Scanner;

public class exams {

    public static void main(String[] args)
    {

        Scanner scan=new Scanner(System.in);

        String input=null;
        char word;

        String output=null;

        System.out.println("Enter a Verse : ");
        input=scan.nextLine();

        System.out.println("Enter a Charachter to Capitalize :  ");
        word=scan.next().charAt(0);

        output=setCap(input,word);

        System.out.println("New Verse : " + output);

    }

    public static String setCap(String x,char c)
    {

        char[] arr=new char[x.length()];

       String nSring=null;

        for(int i=0;i<x.length();i++)
        {

                arr=x.toCharArray();

            if(arr[i]==c)
            {

               c='x';
               arr[i]=c;

            }
        }

        nSring=String.copyValueOf(arr);
        return nSring;

    }

}