Substring

package com.Java;

public class SubString {

    public static void main(String[] args) {
    String str = "cooL";
    String subString = str.substring(2);
    System.out.println(subString);
   
    }

}

Reverse a No

package com.simplePrograms;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ReverseNo {

    public static void main(String[] args)throws IOException {
        int n, reversedNumber = 0, remainder;
       

        System.out.println("Enter an integer: ");
       
        BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));
        n = Integer.parseInt(obj.readLine());
        while(n != 0)
        {
            remainder = n%10;
            reversedNumber = reversedNumber*10 + remainder;
            n = n/10;
        }

        System.out.println("Reversed Number ::"+reversedNumber);

    }

}