Program to find first position of a String in another string

Hi , My today's post is on a program to find  Position of a String in another String.
For Example ,Given two strings, A and B, how to find the first position of B in A? For instance, A = " ab123cdefgcde"; B= "cde" Then the first position of B in A is 6.

import java.util.Scanner; public class SB {  public static void main(String[] args) {   {    String test=null;    String index=null;    int j=0;    System.out.println("Enter the string");    test= new Scanner(System.in).nextLine();    System.out.println("Enter the substring you want to count");    index= new Scanner(System.in).nextLine();    for (int i = 0; i <= test.length()-index.length(); i++) {     String testing=test.substring(i, index.length()+i);       if(testing.equals(index))     {      j=i+1;     System.out.println("It occurs first  at "+ j +" position" );     break;     }    }   }  } }