{"id":3032,"date":"2021-06-09T19:58:40","date_gmt":"2021-06-09T14:28:40","guid":{"rendered":"https:\/\/www.codingbroz.com\/?p=3032"},"modified":"2021-06-22T20:12:31","modified_gmt":"2021-06-22T14:42:31","slug":"java-annotations-solution","status":"publish","type":"post","link":"https:\/\/www.codingbroz.com\/java-annotations-solution\/","title":{"rendered":"Java Annotations | HackerRank Solution"},"content":{"rendered":"\n<p>Hello coders, today we are going to solve <strong>Java Annotations HackerRank Solution<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1167\" height=\"675\" src=\"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/java-annotations.png\" alt=\"Java Annotations\" class=\"wp-image-3033\" srcset=\"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/java-annotations.png 1167w, https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/java-annotations-768x444.png 768w\" sizes=\"(max-width: 1167px) 100vw, 1167px\" \/><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-662aef4fb7e2f\" class=\"ez-toc-cssicon-toggle-label\"><label class=\"ez-toc-title\">Table of Contents<\/label>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0090ff;color:#0090ff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0090ff;color:#0090ff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662aef4fb7e2f\" checked \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Problem\" title=\"Problem\">Problem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Input_Format\" title=\"Input Format\">Input Format<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Constraints\" title=\"Constraints\">Constraints<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Output_Format\" title=\"Output Format\">Output Format<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Sample_Input\" title=\"Sample Input\">Sample Input<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Sample_Output\" title=\"Sample Output\">Sample Output<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.codingbroz.com\/java-annotations-solution\/#Solution_%E2%80%93_Java_Annotations\" title=\"Solution &#8211; Java Annotations\">Solution &#8211; Java Annotations<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Problem\"><\/span><strong>Problem<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Java annotation can be used to define the metadata of a Java class or class element. We can use Java annotation at the compile time to instruct the compiler about the build process. Annotation is also used at runtime to get insight into the properties of class elements.<\/p>\n\n\n\n<p>Java annotation can be added to an element in the following way:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> @Entity\n Class DemoClass{\n\n }<\/code><\/pre>\n\n\n\n<p>We can also set a value to the annotation member. For example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> @Entity(EntityName=\"DemoClass\")\n Class DemoClass{\n\n }<\/code><\/pre>\n\n\n\n<p>In Java, there are several built-in annotations. You can also define your own annotations in the following way:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> @Target(ElementType.METHOD)\n @Retention(RetentionPolicy.RUNTIME)\n @interface FamilyBudget {\n    String userRole() default \"GUEST\";\n }<\/code><\/pre>\n\n\n\n<p>Here, we define an annotation <strong>FamilyBudget<\/strong>, where <strong>userRole <\/strong>is the only member in that custom annotation. The <strong>userRole<\/strong> takes only <strong>String <\/strong>type values, and the default is <strong>&#8220;GUEST&#8221;<\/strong>. If we do not define the value for this annotation member, then it takes the default. By using <strong>@Target<\/strong>, we can specify where our annotation can be used. For example, the <strong>FamilyBudget<\/strong> annotation can only be used with the method in a class. <strong>@Retention<\/strong> defines whether the annotation is available at runtime. To learn more about Java annotation.<\/p>\n\n\n\n<p>Take a look at the following code segment:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Target(ElementType.METHOD)\n@Retention(RetentionPolicy.RUNTIME)\n@interface FamilyBudget {\n    String userRole() default \"GUEST\";\n}\n\nclass FamilyMember {\n\n    public void seniorMember(int budget, int moneySpend) {\n        System.out.println(\"Senior Member\");\n        System.out.println(\"Spend: \" + moneySpend);\n        System.out.println(\"Budget Left: \" + (budget - moneySpend));\n    }\n\n    public void juniorUser(int budget, int moneySpend) {\n        System.out.println(\"Junior Member\");\n        System.out.println(\"Spend: \" + moneySpend);\n        System.out.println(\"Budget Left: \" + (budget - moneySpend));\n    }\n}\n\npublic class Solution {\n    public static void main(String&#91;] args) {\n        Scanner in = new Scanner(System.in);\n        int testCases = Integer.parseInt(in.nextLine());\n        while (testCases &gt; 0) {\n            String role = in.next();\n            int spend = in.nextInt();\n            try {\n                Class annotatedClass = FamilyMember.class;\n                Method&#91;] methods = annotatedClass.getMethods();\n                for (Method method : methods) {\n                    if (method.isAnnotationPresent(FamilyBudget.class)) {\n                        FamilyBudget family = method\n                                .getAnnotation(FamilyBudget.class);\n                        String userRole = family.userRole();\n                        int budgetLimit = family.budgetLimit();\n                        if (userRole.equals(role)) {\n                            if(spend&lt;=budgetLimit){\n                                method.invoke(FamilyMember.class.newInstance(),\n                                        budgetLimit, spend);\n                            }else{\n                                System.out.println(\"Budget Limit Over\");\n                            }\n                        }\n                    }\n                }\n            } catch (Exception e) {\n                e.printStackTrace();\n            }\n            testCases--;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>Here, we partially define an annotation, <strong>FamilyBudget<\/strong> and a class, <strong>FamilyMember<\/strong>. In this problem, we give the user role and the amount of money that a user spends as inputs. Based on the user role, you have to call the appropriate method in the <strong>FamilyMember<\/strong> class. If the amount of money spent is over the budget limit for that user role, it prints Budget Limit Over.<br>Your task is to complete the <strong>FamilyBudget<\/strong> annotation and the <strong>FamilyMember<\/strong> class so that the <strong>Solution <\/strong>class works perfectly with the defined constraints.<\/p>\n\n\n\n<p><strong>Note : <\/strong>You must complete the <strong>5<\/strong> incomplete lines in the editor. You are not allowed to change, delete or modify any other lines. To restore the original code, click on the top-left button on the editor and create a new buffer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Input_Format\"><\/span><strong>Input Format<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The first line of input contains an integer <strong><em>N <\/em><\/strong>representing the total number of test cases. Each test case contains a string and an integer separated by a space on a single line in the following format:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> UserRole MoneySpend<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Constraints\"><\/span><strong>Constraints<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul><li>2 &lt;= N &lt;= 10<\/li><li>0 &lt;= <em>MoneySpend &lt;= <\/em>200 <\/li><li>|<em>UserRole<\/em>| = 6<\/li><li>Name contains only lowercase English letters.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Output_Format\"><\/span><strong>Output Format<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Based on the user role and budget outputs, output the contents of the certain method. If the amount of money spent is over the budget limit, then output <code>Budget Limit Over<\/code>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sample_Input\"><\/span><strong>Sample Input<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code> 3\n SENIOR 75\n JUNIOR 45\n SENIOR 40<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sample_Output\"><\/span><strong>Sample Output<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code> Senior Member\n Spend: 75\n Budget Left: 25\n Junior Member\n Spend: 45\n Budget Left: 5\n Senior Member\n Spend: 40\n Budget Left: 60<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Solution_%E2%80%93_Java_Annotations\"><\/span><strong>Solution &#8211; Java Annotations<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.lang.annotation.*;\nimport java.lang.reflect.*;\nimport java.util.*;\n\n@Target(ElementType.METHOD)\n@Retention(RetentionPolicy.RUNTIME)\n@interface FamilyBudget {\n    String userRole() default \"GUEST\";\n\n    int budgetLimit() default 0;\n}\n\nclass FamilyMember {\n    @FamilyBudget(userRole = \"SENIOR\", budgetLimit = 100)\n    public void seniorMember(int budget, int moneySpend) {\n        System.out.println(\"Senior Member\");\n        System.out.println(\"Spend: \" + moneySpend);\n        System.out.println(\"Budget Left: \" + (budget - moneySpend));\n    }\n\n    @FamilyBudget(userRole = \"JUNIOR\", budgetLimit = 50)\n    public void juniorUser(int budget, int moneySpend) {\n        System.out.println(\"Junior Member\");\n        System.out.println(\"Spend: \" + moneySpend);\n        System.out.println(\"Budget Left: \" + (budget - moneySpend));\n    }\n}\n\npublic class Solution {\n    public static void main(String[] args) {\n        Scanner in = new Scanner(System.in);\n        int testCases = Integer.parseInt(in.nextLine());\n        while (testCases > 0) {\n            String role = in.next();\n            int spend = in.nextInt();\n            try {\n                Class annotatedClass = FamilyMember.class;\n                Method[] methods = annotatedClass.getMethods();\n                for (Method method : methods) {\n                    if (method.isAnnotationPresent(FamilyBudget.class)) {\n                        FamilyBudget family = method\n                                .getAnnotation(FamilyBudget.class);\n                        String userRole = family.userRole();\n                        int budgetLimit = family.budgetLimit();\n                        if (userRole.equals(role)) {\n                            if(spend&lt;=budgetLimit){\n                                method.invoke(FamilyMember.class.newInstance(),\n                                        budgetLimit, spend);\n                            }else{\n                                System.out.println(\"Budget Limit Over\");\n                            }\n                        }\n                    }\n                }\n            } catch (Exception e) {\n                e.printStackTrace();\n            }\n            testCases--;\n        }\n    }\n}<\/pre>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\n<ins class=\"adsbygoogle\"\n     style=\"display:block; text-align:center;\"\n     data-ad-layout=\"in-article\"\n     data-ad-format=\"fluid\"\n     data-ad-client=\"ca-pub-5246141430412355\"\n     data-ad-slot=\"8798433565\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n\n\n\n<p><strong>Disclaimer:<\/strong> The above Problem ( <strong><em><a href=\"https:\/\/www.hackerrank.com\/challenges\/java-annotations\/problem\" target=\"_blank\" data-type=\"URL\" data-id=\"https:\/\/www.hackerrank.com\/challenges\/java-annotations\/problem\" rel=\"noreferrer noopener\">Java Annotations<\/a><\/em><\/strong> ) is generated by<strong> Hacker Rank<\/strong> but the Solution is Provided by <strong>CodingBroz<\/strong>. This tutorial is only for <strong>Educational<\/strong> and <strong>Learning <\/strong>Purpose.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hello coders, today we are going to solve Java Annotations HackerRank Solution.<\/p>\n","protected":false},"author":1,"featured_media":3033,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9,120],"tags":[80,84,18,121],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/java-annotations.png","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/3032"}],"collection":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/comments?post=3032"}],"version-history":[{"count":3,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/3032\/revisions"}],"predecessor-version":[{"id":3768,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/3032\/revisions\/3768"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media\/3033"}],"wp:attachment":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media?parent=3032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/categories?post=3032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/tags?post=3032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}