For example, here is a small sample of the methods used to achieve this in various languages: * Java: String.contains(), String.indexOf(), etc. Java String class provides two versions of substring method to get a substring from the String as given below. 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. Substring in Java. There are two variants of this method. In case of substring startIndex is inclusive and endIndex is exclusive. A part of string is called substring. String.contains() – Case Sensitive Added this response since people are obviously still searching and finding this answer. (Doesn't in your example, but could in other cases.) 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. While it's a simple and common task, the method names often differ between programming languages. Your "indexOf" example should use >= 0, not > 0, since 0 is valid if the substring occurs at the beginning of the string. A null or a string input should returns 0. A common operation in many programming languages is to check if a string contains another string. The String class provides another method called subSequence which acts similar to the substring method. In this guide, we will see how to use this method with the help of examples. Check if a String Contains a Substring in Java. Java String substring example shows how to get a substring from String in Java. Here is the syntax of this method − public String substring(int beginIndex, int endIndex) 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. How to get a substring from String in Java? Method substring() returns a new string that is a substring of given string. You can get substring from the given string object by one of the two methods: In other words, substring is a subset of another string. 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. Updated in 2021 String substring() method variants Above solution is of o(n^3) time complexity. In Java, we can use String.contains() to check if a String contains a substring.. 1. 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. The example also shows how to find substring in a string and then get a substring. It can be directly used inside the if statement. Note: Index starts from 0. Java String contains() method. Syntax. This method has two variants and returns a new string that is a substring of this string. It returns a boolean value true if the specified characters are substring of a given string and returns false otherwise. Find Matching Substring: In This Post, we are trying to learn the different ways to Find Matching Substring of an inputted string in Java. 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. 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