Java String substring() method is used to get the substring of a given string based on the passed indexes. There are two variants of this method. Note: Index starts from 0. Check if a String Contains a Substring in Java. In this guide, we will see how to use this method with the help of examples. A null or a string input should returns 0. Java String contains() method. Above solution is of o(n^3) time complexity. String substring() method variants In case of substring startIndex is inclusive and endIndex is exclusive. The Java String contains() method is used to check whether the specific set of characters are part of the given string or not. Your "indexOf" example should use >= 0, not > 0, since 0 is valid if the substring occurs at the beginning of the string. The substring begins with the character at the specified index and extends to the end of this string or up to endIndex – 1, if the second argument is given. Added this response since people are obviously still searching and finding this answer. String str = "Apples are red"; String substr = "are"; int n1 = str.length(); int n2 = substr.length(); System.out.println("String: " + str); System.out.println("Substring: " + substr); Then a for loop is used to find if the substring is a part of the given string or not. The example also shows how to find substring in a string and then get a substring. You can get substring from the given string object by one of the two methods: A part of string is called substring. Please go through Frequently asked java … Here is the syntax of this method − public String substring(int beginIndex, int endIndex) It can be directly used inside the if statement. The only difference is that it returns a CharSequence instead of a String and it can only be used with a specific start and end index: assertEquals("USA (United States of America)", text.subSequence(67, text.length() - 1)); 4. (Doesn't in your example, but could in other cases.) Find Matching Substring: In This Post, we are trying to learn the different ways to Find Matching Substring of an inputted string in Java. As we have two loops and also String’s substring method has a time complexity of o(n) If you want to find all distinct substrings of String,then use HashSet to remove duplicates. In other words, substring is a subset of another string. Java String substring example shows how to get a substring from String in Java. Substring in Java. Find occurrences of substring in a string in Java In this post, we will see how to find the number of occurrences of one String in another String in Java. Updated in 2021 It returns a boolean value true if the specified characters are substring of a given string and returns false otherwise. Method substring() returns a new string that is a substring of given string. This method has two variants and returns a new string that is a substring of this string. The String class provides another method called subSequence which acts similar to the substring method. Java String class provides two versions of substring method to get a substring from the String as given below. Syntax. In Java, we can use String.contains() to check if a String contains a substring.. 1. A common operation in many programming languages is to check if a string contains another string. How to get a substring from String in Java? Find Substring Using Regex in Java Find Substring Using Apache in Java Find Substring Using Java Regex This tutorial introduces how to check whether a string contains a substring in Java and lists some example codes to understand it. String.contains() – Case Sensitive While it's a simple and common task, the method names often differ between programming languages. 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