{"id":1354,"date":"2022-07-21T04:40:46","date_gmt":"2022-12-25T06:41:15","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/uncategorized\/examples-for-the-java-string-substring-method\/"},"modified":"2024-03-06T14:31:13","modified_gmt":"2024-03-06T14:31:13","slug":"java-string-substring-method","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/java-string-substring-method\/","title":{"rendered":"Java String substring() method"},"content":{"rendered":"<p>The Java substring() method retrieves a segment of characters from a string. It generates a fresh string, while the initial string remains unaltered due to its immutability in Java.<\/p>\n<h2>Methods in <a href=\"https:\/\/www.java.com\/\">Java<\/a> for extracting a substring from a String.<\/h2>\n<p>The Java String substring method has two versions with overloaded variations.<\/p>\n<ol>The &#8220;substring&#8221; method of a string returns a new string that is a portion of the original string. The first variation of the method starts from a specified index and includes all characters until the end of the original string. The second variation of the method starts from a specified beginning index and includes all characters up to, but not including, the character at the specified end index.<\/ol>\n<h2>Key points about the significance of the String substring() method.<\/h2>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>The IndexOutOfBoundsException may be thrown by either of the substring methods if any of the conditions listed below are met:<\/ol>\n<\/li>\n<\/ol>\n<p>&#8211; When beginIndex is a negative number<br \/>\n&#8211; When endIndex exceeds the length of the String object<br \/>\n&#8211; When beginIndex is larger than endIndex<\/p>\n<p>Both substring methods treat beginIndex as inclusive and endIndex as exclusive.<\/p>\n<h2>Example of using the Java String substring() method.<\/h2>\n<p>I have a straightforward Java program for extracting substrings.<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.util;\r\n\r\npublic class StringSubstringExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString str = \"www.scdev.com\";\r\n\t\tSystem.out.println(\"Last 4 char String: \" + str.substring(str.length() - 4));\r\n\t\tSystem.out.println(\"First 4 char String: \" + str.substring(0, 4));\r\n\t\tSystem.out.println(\"website name: \" + str.substring(4, 14));\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>The result of the program mentioned above is the output of the substring example.<\/p>\n<pre class=\"post-pre\"><code>Last 4 char String: .com\r\nFirst 4 char String: www.\r\nwebsite name: scdev\r\n<\/code><\/pre>\n<h2>Using the substring() method to verify if a word or phrase is a palindrome.<\/h2>\n<p>To determine if a String is a palindrome or not, we have the option to utilize the substring() method.<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.util;\r\n\r\npublic class StringPalindromeTest {\r\n\tpublic static void main(String[] args) {\r\n\t\tSystem.out.println(checkPalindrome(\"abcba\"));\r\n\t\tSystem.out.println(checkPalindrome(\"XYyx\"));\r\n\t\tSystem.out.println(checkPalindrome(\"871232178\"));\r\n\t\tSystem.out.println(checkPalindrome(\"CCCCC\"));\r\n\t}\r\n\r\n\tprivate static boolean checkPalindrome(String str) {\r\n\t\tif (str == null)\r\n\t\t\treturn false;\r\n\t\tif (str.length() &lt;= 1) {\r\n\t\t\treturn true;\r\n\t\t}\r\n\t\tString first = str.substring(0, 1);\r\n\t\tString last = str.substring(str.length() - 1);\r\n\t\tif (!first.equals(last))\r\n\t\t\treturn false;\r\n\t\telse\r\n\t\t\treturn checkPalindrome(str.substring(1, str.length() - 1));\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>We&#8217;re determining whether the first and last letter are identical. If they&#8217;re not, the result is false. Otherwise, we recurse the method, passing in the substring without the first and last letter.<\/p>\n<p>You can find additional string examples in our GitHub Repository.<\/p>\n<p>Citation: Oracle API Documentation<\/p>\n<p>&nbsp;<\/p>\n<p>more tutorials<\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/substring-in-python-refers-to-extracting-a-smaller-portion-of-a-string\/\" target=\"_blank\" rel=\"noopener\">Python Substring refers to extracting a smaller portion of a string.<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/spring-mvc-handlerinterceptoradapter-and-handlerinterceptor\/\" target=\"_blank\" rel=\"noopener\">Spring MVC HandlerInterceptorAdapter and HandlerInterceptor.<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/convert-string-to-character-in-java\/\" target=\"_blank\" rel=\"noopener\">convert string to character array in Java.<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/multithreading-in-java-that-you-need-to-know\/\" target=\"_blank\" rel=\"noopener\">multithreading in Java that you need to know<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Java substring() method retrieves a segment of characters from a string. It generates a fresh string, while the initial string remains unaltered due to its immutability in Java. Methods in Java for extracting a substring from a String. The Java String substring method has two versions with overloaded variations. The &#8220;substring&#8221; method of a [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1354","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java String substring() method - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"The Java substring() method retrieves a segment of characters from a string. 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