find a substring in a string java

1package hello;
2
3public class SubStringProblem {
4
5  public static void main(String[] args) {
6
7    // 1st example - You can use the indexOf() method to check if
8    // a String contains another substring in Java
9    // if it does then indexOf() will return the starting index of
10    // that substring, otherwise it will return -1
11
12    System.out
13        .println("Checking if one String contains another String using indexOf() in Java");
14    String input = "Java is the best programming language";
15    boolean isPresent = input.indexOf("Java") != -1 ? true : false;
16
17    if (isPresent) {
18      System.out.println("input string: " + input);
19      System.out.println("search string: " + "Java");
20      System.out.println("does String contains substring? " + "YES");
21    }
22
23    // indexOf is case-sensitive so if you pass wrong case, you will get wrong
24    // result
25    System.out.println("Doing search with different case");
26    isPresent = input.indexOf("java") != -1 ? true : false;
27    System.out.println("isPresent: " + isPresent); // false because indeOf() is
28                                                   // case-sensitive
29
30    // 2nd example - You can also use the contains() method to check if
31    // a String contains another String in Java or not. This method
32    // returns a boolean, true if substring is found on String, or false
33    // otherwise.
34    // if you need boolean use this method rather than indexOf()
35    System.out
36        .println("Checking if one String contains another String using contains() in Java");
37    input = "C++ is predecessor of Java";
38    boolean isFound = input.contains("Java");
39    if (isFound) {
40      System.out.println("input string: " + input);
41      System.out.println("search string: " + "Java");
42      System.out.println("does substring is found inside String? " + "YES");
43    }
44
45    // contains is also case-sensitive
46    System.out.println("Searching with different case");
47    isFound = input.contains("java");
48    System.out.println("isFound: " + isFound); // false because indeOf() is
49                                               // case-sensitive
50
51  }
52}
53
54Output
55Checking if one String contains another String using indexOf() in Java
56input string: Java is the best programming language
57search string: Java
58does String contain substring? YES
59Doing search with different case
60isPresent: false
61Checking if one String contains another String using contains() in Java
62input string: C++ is the predecessor of Java
63search string: Java
64does substring is found inside String? YES
65Searching for different case
66isFound: false