{"id":20291,"date":"2022-11-09T06:53:31","date_gmt":"2022-11-09T01:23:31","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-modify-non-immutable-object-java\/"},"modified":"2022-11-09T06:53:31","modified_gmt":"2022-11-09T01:23:31","slug":"solved-modify-non-immutable-object-java","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-modify-non-immutable-object-java\/","title":{"rendered":"[Solved] Modify non immutable object, java"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-34483143\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"34483143\" data-parentid=\"34482754\" data-score=\"0\" data-position-on-page=\"2\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<blockquote>\n<p>I have one StringBuilder, a non immutable object and if I use a method on the object it will return me a new value of the object with the same reference object.  <\/p>\n<\/blockquote>\n<ul>\n<li>Not always will a method return you the same reference object. It might create a new object and return that. Its always better to check the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/docs.oracle.com\/javase\/7\/docs\/api\/java\/lang\/StringBuilder.html\">docs<\/a> before you assume anything.\n<\/li>\n<\/ul>\n<blockquote>\n<p>Why when I am using <code>a.substring ( int a, int b )<\/code>, it is not modifying the object <code>StringBuilder<\/code>?  <\/p>\n<\/blockquote>\n<ul>\n<li>If you read the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/docs.oracle.com\/javase\/7\/docs\/api\/java\/lang\/StringBuilder.html#substring%28int,%20int%29\">documentation<\/a>, it clearly states that <code>substring(int,int)<\/code> method <em>Returns a <strong>new String<\/strong><\/em>. That answers why your object is not being modified.\n<\/li>\n<\/ul>\n<blockquote>\n<p>Why if I use the method <code>a.append(\"value\")<\/code> I am modifying the value of the <code>StringBuilder<\/code> object?<\/p>\n<\/blockquote>\n<ul>\n<li>Again if you read the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/docs.oracle.com\/javase\/7\/docs\/api\/java\/lang\/StringBuilder.html#append%28java.lang.String%29\">docs<\/a> for <code>append(String)<\/code>, it clearly states that it &#8211; <em>Returns: a reference to <strong>this object.<\/strong><\/em>. This method complies with what <em>&#8220;your thinking&#8221;<\/em> was.<\/li>\n<\/ul>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Modify non immutable object, java <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I have one StringBuilder, a non immutable object and if I use a method on the object it will return me a new value of the object with the same reference object. Not always will a method return you the same reference object. It might create a new object and return that. Its always &#8230; <a title=\"[Solved] Modify non immutable object, java\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-modify-non-immutable-object-java\/\" aria-label=\"More on [Solved] Modify non immutable object, java\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[323,1428,428],"class_list":["post-20291","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java","tag-stringbuilder","tag-substring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Modify non immutable object, java - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-modify-non-immutable-object-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Modify non immutable object, java - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I have one StringBuilder, a non immutable object and if I use a method on the object it will return me a new value of the object with the same reference object. 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