String searching methods indexOf and lastIndexOf. - Java Language Basics

Java examples for Language Basics:String

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Description

String searching methods indexOf and lastIndexOf.

Demo Code

public class Main 
{
   public static void main(String[] args)
   {/*from w w w  .j av a2  s .  co m*/
      String letters = "abcdefghijklmabcdefghijklm";

      // test indexOf to locate a character in a string
      System.out.printf(
         "'c' is located at index %d\n", letters.indexOf('c'));
      System.out.printf(
         "'a' is located at index %d\n", letters.indexOf('a', 1));
      System.out.printf(
         "'$' is located at index %d\n\n", letters.indexOf('$'));

      // test lastIndexOf to find a character in a string
      System.out.printf("Last 'c' is located at index %d\n",
         letters.lastIndexOf('c'));
      System.out.printf("Last 'a' is located at index %d\n",
         letters.lastIndexOf('a', 25));
      System.out.printf("Last '$' is located at index %d\n\n",
         letters.lastIndexOf('$'));

      // test indexOf to locate a substring in a string
      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"));

      // test lastIndexOf to find a substring in a string
      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"));
   } 
}

Result


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