Can I execute a Java method for finding the substring of a string?

In the context of Java programming language, you can check if string contain substring or not by using the method of “ contains()” or even the method of “indexOf()”. Here is the example given of how you can implement the “containsSubstring” method for your particular objective:-

Public class SubstringChecker {
    Public static boolean containsSubstring(String mainString, String subString) {
        Return mainString.contains(subString);
        // Alternatively, you can use indexOf method:
        // return mainString.indexOf(subString) != -1;
    }
    Public static void main(String[] args) {
        String text = “This is a sample text to check if substring exists.”;
        String wordToCheck = “sample”;
        Boolean isSubstring = containsSubstring(text, wordToCheck);
        System.out.println(“Does the text contain the word ‘sample’? “ + isSubstring);
    }
}

In this above code the “containsSubstring” method would use the “contains()” method for ensuring or checking if “mainstring” contains “substrings” or not. If the substring would be found the result would be provided in the form of “true”, however, if there would be no substring of the string then the result would be “false”.