{"id":5006,"date":"2019-09-16T11:05:33","date_gmt":"2019-09-16T15:05:33","guid":{"rendered":"https:\/\/www.freelancinggig.com\/blog\/?p=5006"},"modified":"2019-09-16T11:05:37","modified_gmt":"2019-09-16T15:05:37","slug":"frequently-asked-java-programming-interview-questions","status":"publish","type":"post","link":"https:\/\/www.freelancinggig.com\/blog\/2019\/09\/16\/frequently-asked-java-programming-interview-questions\/","title":{"rendered":"Frequently Asked Java Programming Interview Questions"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>Question: Can we Override or Overload static methods in the java?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Overriding:\nIt is mainly related to the run-time polymorphism. The subclass or the derived\nclass offers a specific implementation about the method in a superclass or on\nthe base class at the runtime.<\/li><li>Overloading:\nIt is mainly related to compiling time which is also known as static\npolymorphism. Such kind of feature allows various methods to have a similar\nname, but diverse signatures, a particular number of input parameters along\nwith the kind of input parameters.<\/li><li>Can we\noverload the methods of static? Here, the answer is &#x2018;Yes&#x2019;. We may have two and\nmore static methods having a similar name, but differences in the input\nparameters<\/li><li>Can we\nalso override static methods in the java? We may also declare the static\nmethods with a similar signature in the subclass, but it is not considered\noverriding as there will not be any kind of the run-time polymorphism. So, the\nanswer is &#x2018;No&#x2019;. The Static methods cannot get overridden for the reason that\nthe method overriding usually occurs in the context of dynamic such as i.e.\nruntime and also the lookup of methods. The Static methods with their name are\nalso looked up statically such as i.e. at compile-time.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: Why the key method of java is static?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, the static method is key in java as\notherwise there will also be ambiguity: that constructor must be called?\nParticularly when your class appears like this:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Should JVM call the new JavaClass or (int)?\nWhat must it pass for x? In <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/case\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>case<\/a> not, should JVM instantiate of the JavaClass\ndevoid of running any kind of method for constructor? As this will special-case\nfor the complete class &ndash; at times, you have a chance that has not been\ninitialized; you need to check for each method which may also be called. There\nare usually various edge cases as well as ambiguities that make sense for JVM\nto get instantiate a class before the entry point. This is the reason that the\nkey point is static in java.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: What will happen if you will remove the static modifier from the key method?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#xA0;The Program compiles effectively,\nhowever at the time of runtime throws some error which says\n&#x201C;NoSuchMethodError&#x201D;.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: What is the scope of the variables in Java for mentioned cases?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Member\nVariables which is Class Level Scope: variables member should be declared\ninside the class and outside any of function. These will be accessed directly\nanywhere in the class<\/li><li>Local\nVariables that is also known as Method Level Scope: The Variables that are\ndeclared inside the method with the level scope and may not be accessed outside\nmethod.<\/li><li>Loop\nVariables or the <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/block\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>Block<\/a> Scope: A variable which is declared inside the pair of\nbrackets &ldquo;{&rdquo; and &ldquo;}&rdquo; in the method which has scope within the brackets.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: What is the meaning of &#x201C;this&#x201D; keyword in java?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With the instance method or with the\nconstructor, this is mainly the reference to current object &#x2014; where the object\nwhose method and the constructor are being called. You may even refer to any of\nthe members of the current object from the instance method or the constructor\nwith the use of this<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use of &#x201C;this&#x201D; keyword<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; It is used to refer to the current class of\nthe instance variable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; It helps to invoke the current class\nconstructor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&ndash; It may also be passed as an <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/argument\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>argument<\/a> in the\nmethod call.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; It may also be passed as an argument in the\nconstructor call.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; It is also used to return the instance of\nthe current class.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; It is used to invoke the current class\nmethod such as implicitly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: What does <a class=\"glossaryLink\" href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/abstract-class\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">abstract class<\/a> means in java? How the <a class=\"glossaryLink\"  href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/abstract\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>abstract<\/a> classes are different or similar in Java from C++?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Abstract classes are main classes which\ninclude one or more methods of abstract. The <a class=\"glossaryLink\" href=\"https:\/\/www.freelancinggig.com\/blog\/glossary\/abstract-method\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">abstract method<\/a> is the method\nwhich is declared, but it does not contain any implementation. The Abstract\nclasses might not be instantiated, and it might need subclasses to offer implementations\nfor abstract methods.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; C++, in Java, it is an instance of an\nabstract class which could not be created, we may also have references to the\nabstract class type.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; C++, abstract class may also consist\nconstructors in the Java. And also the constructor of the abstract class is\nknown when an instance of the inherited class gets created<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; Also in Java, we may even have an abstract\nclass that is devoid of any method of abstract. It allows us to create the\nclasses which cannot get instantiated but may just be inherited.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; The Abstract classes may even have the final\nmethods or the methods which may not be overridden. For instance, the following\nprogram usually compiles and it also runs fine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: Can the main method be overloaded?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The key method in Java is mainly about no\nadditional terrestrial method. Apart from the truth that main is only like some\nother method &amp; it may also get overloaded similarly, JVM usually looks for\na method for the signature to launch the program.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; The normal and the key method always act as\nthe entry point for JVM to begin the program execution.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x2013; We may also overload the key method in Java.\nHowever, the program does not execute the overloaded key method while we run\nthe program; we should call the overloaded main method and that also from the\nactual method.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question: What do we mean by object cloning?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The concept of Object cloning means creating\nthe exact and precise copy of the original object. When the class requires\nsupporting the object cloning, it should implement the interface of\njava.lang.Cloneable and override clone or the method from the Object class.\nMoreover, Syntax of the clone method is as mentioned below:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Protected Object clone that throws\nCloneNotSupportedException<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the object&#x2019;s class does not implement the\ninterface of Cloneable then it will throw an exception of &#x2018;CloneNotSupportedException&#x2019;.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Question: Do we have access to override the\nprivate methods in Java?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The answer is No; the private method will not\nbe overridden as it is not visible from any different class.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Question: Can we Override or Overload static methods in the java? Overriding: It is mainly related to the run-time polymorphism. The subclass or the derived &#x2026;<\/p>\n","protected":false},"author":3,"featured_media":5008,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[149],"tags":[212,1635],"class_list":["post-5006","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-startup-resources","tag-java","tag-java-programming-interview-questions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Frequently Asked Java Programming Interview Questions - Developers, Designers &amp; Freelancers - FreelancingGig<\/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:\/\/www.freelancinggig.com\/blog\/2019\/09\/16\/frequently-asked-java-programming-interview-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Frequently Asked Java Programming Interview Questions - Developers, Designers &amp; Freelancers - FreelancingGig\" \/>\n<meta property=\"og:description\" content=\"Question: Can we Override or Overload static methods in the java? 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