int indexOf(String str, int fromIndex)

import java.io.*;
public class Test {

   public static void main(String args[]) {
      String Str = new String("Welcome to Tutorialspoint.com");
      String SubStr1 = new String("Tutorials" );
      System.out.print("Found Index :" );
      System.out.println( Str.indexOf( SubStr1, 15 ));
   }
}

Found Index :-1