Note: the index starts from ‘0’ which refer to the first character of String. The substring begins with a character at the specified index ‘beginIndex’ to the end of the string. This method has two variants and it returns a new string that is a substring of this string. String substring(int beginIndex, int endIndex).There are basically two different methods under the substring() method. 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. Substring in Java: Different methods under substring Let’s move ahead and understand the different methods under substring(). It will throw IndexOutOfBoundsException if startIndex is negative or larger than the length of this String object. Here, the string is “Edureka” but when you break it down into blocks, it’s composed of substrings which finally compute the string. public String substring (int startIndex): Returns a new string which start from a specified string and extends to the end of this string. This is a clear example of a substring in Java. Throws StringIndexOutOfBoundsException for invalid argument, works with Unicode. string.substring(start, end) Parameter, Description start, Required. substring() method is an overloaded method. Java String charAt() Method returns the character at the given index. The Java substring () method returns a new string that is a substring of this string. In other words, substring is a subset of another string. Substring in Java: What is a substring in Java?Ī part of a stringis called a S ubstring. Java - get first 3 characters of string String text 1234 String firstCharacters text.substring(0, 3) ( firstCharacters ) // 123. If it does not occur as a substring, -1 is returned. substring(int beginIndex, int endIndex) lastIndexOf (String str): This method accepts a String as an argument, if the string argument occurs one or more times as a substring within this object, then it returns the index of the first character of the last such substring is returned.These are the topics that I’ll be covering in this article: So, I’ll explain how Substring in Java works. In Java, objects of a String are immutable which means that a constant cannot be changed once created. Finding the substring of a string is a very common question asked in the Java interviews. Strings are basically defined as an array of characters.
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