Use lastIndexOf to find a substring in a string : String Find Search « Data Type « Java Tutorial

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public class MainClass
{
   public static void main( String args[] )
   {
      String letters = "abcdefghijklmabcdefghijklm";

      System.out.printf( "Last \"def\" is located at index %d\n",
          letters.lastIndexOf( "def" ) );
       System.out.printf( "Last \"def\" is located at index %d\n",
          letters.lastIndexOf( "def", 25 ) );
       System.out.printf( "Last \"hello\" is located at index %d\n",
          letters.lastIndexOf( "hello" ) );
   }
}

Last "def" is located at index 16
Last "def" is located at index 16
Last "hello" is located at index -1