Java Program To Search String Using IndexOf Example

/*
  Java Search String using indexOf Example
  This example shows how we can search a word within a String object using
  indexOf method.
*/

public class SearchStringExample {

  public static void main(String[] args) {
    //declare a String object
    String strOrig = "Hello world Hello World";
   
    /*
      To search a particular word in a given string use indexOf method.
      indexOf method. It returns a position index of a word within the string
      if found. Otherwise it returns -1.
    */
   
    int intIndex = strOrig.indexOf("Hello");
   
    if(intIndex == - 1){
      System.out.println("Hello not found");
    }else{
      System.out.println("Found Hello at index " + intIndex);      
    }
   
    /*
      we can also search a word after particular position using
      indexOf(String word, int position) method.  
    */
   
    int positionIndex = strOrig.indexOf("Hello",11);
    System.out.println("Index of Hello after 11 is " + positionIndex);
   
    /*
      Use lastIndexOf method to search a last occurrence of a word within string.
    */
    int lastIndex = strOrig.lastIndexOf("Hello");
    System.out.println("Last occurrence of Hello is at index " + lastIndex);

  }
}

/*
Output of the program would be :
Found Hello at index 0
Index of Hello after 11 is 12
Last occurrence of Hello is at index 12
*/