Offering a wide range of features and methods, the Java programming language is one of the major programming languages \u200b\u200bin use today. The list of available data types is one of the most important aspects of any programming language.<\/p>\n
Java will classify data types as Primitive and Non-Primitive data types when String is a Non-Primitive type, meaning it refers to an object. Various methods are present in this string object used to perform various string operations. One such method is the substring() function in Java.<\/p>\n
Examples:<\/strong><\/p>\n A portion of a string is returned by the Java String class substring(). We pass beginIndex and endIndex number position in the Java substring method where beginIndex is inclusive, and endIndex is exclusive. For example, the initial index begins at 0 while the end index begins at 1. In the Java String, there are two types of subsparing methods.<\/p>\n Output:<\/strong> Parameters:<\/strong><\/p>\n Start position.<\/span><\/p>\n First character is at index 0.<\/span><\/td>\n<\/tr>\n End position (up to, but not including).<\/span><\/p>\n If omitted: the rest of the string.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Return Value:<\/strong><\/p>\n Substring extraction is used in a wide variety of applications, including prefix and suffix extraction. The name or the denomination alone from a string containing both quantity and currency symbol could be extracted, e.g. to extract Lastname as an example. The latter is explained in more detail below.<\/p>\n The above application shall be implemented in the following way:<\/strong><\/p>\n Output:<\/strong> Using the provided indices, the substring method in Java can be used to extract a portion of a string and generate a new string.<\/p>\n The substring approach comes in two forms:<\/strong><\/p>\n A new string that is a substring of the original string is what this method returns. The substring stretches from the character at the startIndex supplied all the way to the string’s conclusion.<\/p>\n Syntax:<\/strong><\/p>\n Parameters:<\/strong><\/p>\n Return Value:<\/strong><\/p>\n While the second variant enables you to give both the starting and ending indices for a more precise substring extraction, the first variant extracts the substring from a specified starting index to the end of the string.<\/p>\n Syntax:<\/strong><\/p>\n Parameters:<\/strong><\/p>\n Return Value:<\/strong><\/p>\n The following example uses substring() to display characters from the string “Techvidvan”:<\/strong><\/p>\n Output:<\/strong> For the extraction of the last characters of a string, the following example uses substring() and length properties. Given you don’t have to know the starting and end indices like in the examples below, this method can be more easily remembered.<\/p>\n Output:<\/strong> A substring of a string is replaced by the following example. It’s replacing both single characters and substrings. The Brave New World string is converted to the Brave New Web by a function call at the end of this example.<\/p>\n Replaces the substring in a string A substring of a string is replaced by the following example. It’s replacing both single characters and substrings. The Brave New World string is converted to the Brave New Web by a function call at the end of this example.<\/p>\n A string is a very important data type, and the substring method simply returns part of the original string. Once the subprobation method is called, it creates a new string with an offset and a number. We have given several examples for studying substrings using different methods. Code with relevant screenshots are attached.<\/p>\n","protected":false},"excerpt":{"rendered":" Offering a wide range of features and methods, the Java programming language is one of the major programming languages \u200b\u200bin use today. The list of available data types is one of the most important...<\/p>\n","protected":false},"author":6,"featured_media":447361,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[183],"tags":[296,273,299,263,250,274,275],"class_list":["post-89407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java","tag-java-string-substring","tag-java-tutorial","tag-java-tutorial-for-beginners","tag-learn-java","tag-learn-java-string-substring","tag-string-substring-in-java"],"yoast_head":"\nExtract a substring from text:\r\nlet text = \"Tech Vidvan!\";\r\nlet result = text.substring(1, 4);<\/pre>\n
What is Java String substring():<\/h2>\n
Internal implementation substring(int beginIndex):<\/h3>\n
public String substring(int beginIndex) { \r\n if (beginIndex < 0) { \r\n throw new StringIndexOutOfBoundsException(beginIndex); \r\n } \r\n int subLen = value.length - beginIndex; \r\n if (subLen < 0) { \r\n throw new StringIndexOutOfBoundsException(subLen); \r\n } \r\n return (beginIndex == 0) ? this : new String(value, beginIndex, subLen); \r\n }<\/pre>\nInternal implementation substring(int beginIndex, int endIndex):<\/h3>\n
public String substring(int beginIndex, int endIndex) \r\n{ \r\nif (beginIndex < 0) \r\n{ \r\nthrow new StringIndexOutOfBoundsException(beginIndex); \r\n} \r\nif (endIndex > value.length) \r\n{ \r\nthrow new StringIndexOutOfBoundsException(endIndex); \r\n} \r\nint subLen = endIndex - beginIndex; \r\nif (subLen < 0) \r\n{ \r\nthrow new StringIndexOutOfBoundsException(subLen); \r\n} \r\nreturn ((beginIndex == 0) && (endIndex == value.length)) ? this : new String(value, beginIndex, subLen); \r\n}<\/pre>\nJava String substring() method example:<\/h3>\n
public class SubstringExample{ \r\npublic static void main(String args[]){ \r\nString s1=\"techvidvan\"; \r\nSystem.out.println(s1.substring(2,4));\r\nSystem.out.println(s1.substring(2));\r\n}}<\/pre>\n
\nch
\nchvidvan<\/p>\n\n\n
\n Parameters<\/strong><\/td>\n Description<\/strong><\/td>\n<\/tr>\n \n start<\/span><\/td>\n Required.<\/span><\/p>\n \n end<\/span><\/td>\n Optional.<\/span><\/p>\n \n\n
\n Type<\/span><\/td>\n Description<\/span><\/td>\n<\/tr>\n \n A string<\/span><\/td>\n A string containing the extracted characters.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Possible Application:<\/h3>\n
public class Techvidvan {\r\n public static void main(String args[])\r\n {\r\n String Str = new String(\"Rs 1000\");\r\n System.out.print(\"The original string is : \");\r\n System.out.println(Str);\r\n System.out.print(\"The extracted substring is : \");\r\n System.out.println(Str.substring(3));\r\n }\r\n}<\/pre>\n
\nThe original string is:<\/strong> Rs 1000
\nThe extracted substring is:<\/strong> 1000<\/p>\nSubstring in Java:<\/h3>\n
\n
String substring()<\/h3>\n
public String substring(int StartIndex);<\/pre>\n
\n
\n
String substring(StartIndex, endIndex):<\/h3>\n
public String substring(int StartIndex, int endIndex);<\/pre>\n
\n
\n
Examples:<\/h3>\n
Using substring()<\/h4>\n
const anyString = \"Techvidvan\";\r\nconsole.log(anyString.substring(0, 1));\r\nconsole.log(anyString.substring(1, 0)); \r\nconsole.log(anyString.substring(0, 6)); \r\nconsole.log(anyString.substring(4)); \r\nconsole.log(anyString.substring(4, 7)); \r\nconsole.log(anyString.substring(7, 4)); \r\n\r\nconsole.log(anyString.substring(0, 7));\r\nconsole.log(anyString.substring(0, 10));<\/pre>\n
\nT
\nT
\nTechvi
\nvidvan
\nvid
\nvid
\nTechvid
\nTechvidvan<\/p>\nUsing substring() with length property:<\/h3>\n
const text = \"Techvidvan\";\r\nconsole.log(text.substring(text.length - 4)); \r\nconsole.log(text.substring(text.length - 5));<\/pre>\n
\ndvan
\nidvan<\/p>\nReplaces the substring in a string :<\/h3>\n
function replaceString(oldS, newS, fullS) {\r\n for (let i = 0; i < fullS.length; ++i) {\r\n if (fullS.substring(i, i + oldS.length) === oldS) {\r\n fullS =\r\n fullS.substring(0, i) +\r\n newS +\r\n fullS.substring(i + oldS.length, fullS.length);\r\n }\r\n }\r\n return fullS;\r\n}\r\nreplaceString(\"Hello\", \"World\", \"Hi TechVidvan\");<\/pre>\nApplications of substring() Method:<\/h3>\n
Conclusion<\/h3>\n