Use String.indexOf to locate a substring in a string : String Find Search « Data Type « Java Tutorial

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2. Data Type
3. String Find Search

public class MainClass
{
   public static void main( String args[] )
   {
      String letters = "abcdefghijklmabcdefghijklm";
      System.out.printf( "\"def\" is located at index %d\n", 
          letters.indexOf( "def" ) );
       System.out.printf( "\"def\" is located at index %d\n",
          letters.indexOf( "def", 7 ) );
       System.out.printf( "\"hello\" is located at index %d\n\n",
          letters.indexOf( "hello" ) );
   }
}

"def" is located at index 3
"def" is located at index 16
"hello" is located at index -1