indzi

//creating iterator n for collection numbers

for(Iterator n = numbers.iterator() ;n.hasNext(); ) {

indzi

//charAt method will pick the specific character of the string of position number of j

for (int j = 0; j < halfString.length(); j += 2) {
    char finalOutPutChar = halfString.charAt(j);
    finalOutPut = finalOutPut + finalOutPutChar;
}

indzi

//You can use any of the following options based on the requirements.

//Scanner class

Scanner scan = new Scanner(System.in);
String s = scan.next();
int i = scan.nextInt();

//BufferedReader and InputStreamReader classes