String contains()

The Java contains() method is used to check whether a particular sequence of characters (substring) is present within a given string. It returns a boolean value, true if the substring is found in the string, and false otherwise. The basic syntax of the contains() method is as follows:

boolean result = originalString.contains(substring);

• originalString: The string in which you want to check for the presence of a substring.
• substring: The substring you want to check for within the original string.

Here’s an example of using the contains() method:

public class ContainsExample {
    public static void main(String[] args) {
        String text = "The quick brown fox jumps over the lazy dog.";
        String target = "fox";

        boolean containsFox = text.contains(target);

        if (containsFox) {
            System.out.println("The string contains the word 'fox'.");
        } else {
            System.out.println("The string does not contain the word 'fox'.");
        }
    }
}

In this example, the contains() method is used to check if the string text contains the substring “fox.” Since “fox” is present in the original string, the result will be true, and the program will print “The string contains the word ‘fox’.”

It’s important to note that the contains() method performs a case-sensitive search. If you need to perform a case-insensitive search, you can convert both the original string and the substring to lowercase (or uppercase) using the toLowerCase() method and then use contains():

String text = "The quick brown fox jumps over the lazy dog.";
String target = "FOX";

boolean containsFox = text.toLowerCase().contains(target.toLowerCase());

This modification makes the search case-insensitive, allowing “FOX” to be found in the original string, regardless of the case.