{"id":21131,"date":"2023-02-13T07:09:52","date_gmt":"2023-02-13T07:09:52","guid":{"rendered":"https:\/\/www.booksofall.com\/cn\/?post_type=product&#038;p=21131"},"modified":"2023-02-13T07:09:52","modified_gmt":"2023-02-13T07:09:52","slug":"learning-java-language","status":"publish","type":"product","link":"https:\/\/www.booksofall.com\/cn\/learning-java-language\/","title":{"rendered":"Learning Java Language"},"content":{"rendered":"<p>The <a href=\"https:\/\/en.wikipedia.org\/wiki\/Java_(programming_language)\">Java programming language<\/a> is&#8230;<\/p>\n<ul>\n<li>General purpose: It is designed to be used for writing software in a wide variety of application domains, and lacks specialized features for any specific domain.<\/li>\n<li>Class-based: Its object structure is defined in classes. Class instances always have those fields and methods specified in their class definitions (see Classes and Objects). This is in contrast to non-class-based languages such as JavaScript.<\/li>\n<li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/Static_typing\">Statically-typed<\/a>: the compiler checks at compile time that variable types are respected. For example, if a method expects an argument of type String, that argument must in fact be a string when the method is called.<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Object-oriented_programming\">Object-oriented<\/a>: most things in a Java program are class instances, i.e. bundles of state (fields) and behavior (methods that operate on data and form the object&#8217;s interface to the outside world).<\/li>\n<li>Portable: It can be compiled on any platform with javac and the resultant class files can run on any platform that has a JVM.<\/li>\n<\/ul>\n<p>Java is intended to let application developers <a href=\"https:\/\/en.wikipedia.org\/wiki\/Write_once,_run_anywhere\">&#8220;write once, run anywhere&#8221; (WORA)<\/a>, meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.<\/p>\n<p>Java code is compiled to bytecode (the .class files) which in turn get interpreted by the<a href=\"https:\/\/en.wikipedia.org\/wiki\/Java_virtual_machine\"> Java Virtual Machine (JVM)<\/a>. In theory, bytecode created by one Java compiler should run the same way on any JVM, even on a different kind of computer. The JVM might (and in real-world programs will) choose to compile into native machine commands the parts of the bytecode that are executed often. This is called &#8220;Just-in-time (JIT) compilation&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><iframe frameborder=\"0\" allowtransparency=\"true\" allowFullscreen=\"true\" style=\"width: 100%; height: 700px; border: none;\" src=\"https:\/\/online.visual-paradigm.com\/share\/book\/java-language-198ept0r4s?enforceShowPromotionBar=true&#038;p=1\"><\/iframe><\/p>\n","protected":false},"featured_media":21135,"template":"","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":""},"product_brand":[],"product_cat":[276],"product_tag":[],"class_list":{"0":"post-21131","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-java","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Learning Java Language - BooksOfAll Simplified Chinese<\/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.booksofall.com\/cn\/learning-java-language\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learning Java Language - BooksOfAll Simplified Chinese\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.booksofall.com\/cn\/learning-java-language\/\" \/>\n<meta property=\"og:site_name\" content=\"BooksOfAll Simplified Chinese\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.booksofall.com\/cn\/wp-content\/uploads\/sites\/2\/2023\/02\/img_63e9e0b178a26.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.booksofall.com\/cn\/wp-content\/uploads\/sites\/2\/2023\/02\/img_63e9e0b178a26.png\" \/>\n<meta name=\"twitter:label1\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.booksofall.com\/cn\/learning-java-language\/\",\"url\":\"https:\/\/www.booksofall.com\/cn\/learning-java-language\/\",\"name\":\"Learning Java Language - 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