Contains: The String

The String.contains() method is used to search for a sequence of characters within a string. In this article, we will learn how to effectively use the string contains functionality in Java. Which word, “contains” or “contain,” should fill in the blank? Since we are referring to a single book in the third-person singular, we would use “contains.” Thus, the correct sentence is, “The book contains important information.” On the other hand, if we are talking about multiple books, we would use “contain.” java.lang.String provides a boolean method contains() that returns ‘true’ if a sequence of characters is found within the given string and ‘false’ otherwise The contains() method in Java's String class offers a convenient solution for efficiently checking the existence of a substring within a given string.