{"id":26063,"date":"2022-12-15T07:34:33","date_gmt":"2022-12-15T02:04:33","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-passing-boolean-to-method-that-expects-boolean-closed\/"},"modified":"2022-12-15T07:34:33","modified_gmt":"2022-12-15T02:04:33","slug":"solved-passing-boolean-to-method-that-expects-boolean-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-passing-boolean-to-method-that-expects-boolean-closed\/","title":{"rendered":"[Solved] Passing Boolean to method that expects boolean [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-66560526\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"66560526\" data-parentid=\"66560386\" data-score=\"4\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" 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<h2>Unboxing<\/h2>\n<p>When you call a method that wants a <code>boolean<\/code> but give it a <code>Boolean<\/code>, Java has to <strong>unbox<\/strong> the value. This happens automatically and implicitly.<\/p>\n<p>Therefore, during compilation, Java replaces your call<\/p>\n<pre><code>foo(value);\n<\/code><\/pre>\n<p>by<\/p>\n<pre><code>foo(value.booleanValue());\n<\/code><\/pre>\n<p>This process is explained in detail in <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/specs\/jls\/se15\/html\/jls-5.html#jls-5.1.8\">JLS, chapter 5.1.8. Unboxing Conversion<\/a>:<\/p>\n<blockquote>\n<p>At run time, unboxing conversion proceeds as follows:<\/p>\n<ul>\n<li>If <code>r<\/code> is a reference of type <code>Boolean<\/code>, then unboxing conversion converts <code>r<\/code> into <code>r.booleanValue()<\/code><\/li>\n<\/ul>\n<\/blockquote>\n<hr>\n<h2>Unboxing <code>null<\/code><\/h2>\n<p>Now, when <code>value<\/code> is <code>null<\/code>, this statement obviously leads to a <code>NullPointerException<\/code> at runtime, since you are trying to call a method (<code>booleanValue<\/code>) on a variable that does not refer to any instance.<\/p>\n<p>So your code crashes, it will not use any default value as fallback. Java was designed with <em>fail-fast<\/em> in mind.<\/p>\n<hr>\n<h2>Get <code>false<\/code> instead<\/h2>\n<p>In case you want the method to receive <code>false<\/code> as fallback value, you have to code this explicitly yourself. For example by:<\/p>\n<pre><code>foo(value == null ? false : value);\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Passing Boolean to method that expects boolean [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Unboxing When you call a method that wants a boolean but give it a Boolean, Java has to unbox the value. This happens automatically and implicitly. Therefore, during compilation, Java replaces your call foo(value); by foo(value.booleanValue()); This process is explained in detail in JLS, chapter 5.1.8. Unboxing Conversion: At run time, unboxing conversion proceeds &#8230; <a title=\"[Solved] Passing Boolean to method that expects boolean [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-passing-boolean-to-method-that-expects-boolean-closed\/\" aria-label=\"More on [Solved] Passing Boolean to method that expects boolean [closed]\">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":[665,323,5333,5332],"class_list":["post-26063","post","type-post","status-publish","format-standard","hentry","category-solved","tag-boolean","tag-java","tag-unboxing","tag-wrapper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Passing Boolean to method that expects boolean [closed] - 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-passing-boolean-to-method-that-expects-boolean-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Passing Boolean to method that expects boolean [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Unboxing When you call a method that wants a boolean but give it a Boolean, Java has to unbox the value. 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