Check out example codes for "String indexOf(String str int fromIndex) method in java". It will help you in understanding the concepts better.

Code Example 1

import java.util.*;
public class StringIndexOfMethodExample
{
   public static void main(String[] args)
   {
      String strInput = new String("hello world core java");
      String strSub = new String("core");
      System.out.print("Index found: " );
      System.out.println(strInput.indexOf(strSub, 3));
   }
}

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