Java Search String using indexOf Example

1. /*
2.   Java Search String using indexOf Example
3.   This example shows how we can search a word within a String object using
4.   indexOf method.
5. */
6.  
7. public class SearchStringExample {
8.  
9. public static void main(String[] args) {
10. //declare a String object
11. String strOrig = "Hello world Hello World";
12.  
13. /*
14.   To search a particular word in a given string use indexOf method.
15.   indexOf method. It returns a position index of a word within the string
16.   if found. Otherwise it returns -1.
17.   */
18.  
19. int intIndex = strOrig.indexOf("Hello");
20.  
21. if(intIndex == - 1){
22. System.out.println("Hello not found");
23. }else{
24. System.out.println("Found Hello at index " + intIndex);
25. }
26.  
27. /*
28.   we can also search a word after particular position using
29.   indexOf(String word, int position) method.
30.   */
31.  
32. int positionIndex = strOrig.indexOf("Hello",11);
33. System.out.println("Index of Hello after 11 is " + positionIndex);
34.  
35. /*
36.   Use lastIndexOf method to search a last occurrence of a word within string.
37.   */
38. int lastIndex = strOrig.lastIndexOf("Hello");
39. System.out.println("Last occurrence of Hello is at index " + lastIndex);
40.  
41. }
42. }
43.  
44. /*
45. Output of the program would be :
46. Found Hello at index 0
47. Index of Hello after 11 is 12
48. Last occurrence of Hello is at index 12
49. */