{"id":156437,"date":"2019-08-16T00:36:00","date_gmt":"2019-08-15T16:36:00","guid":{"rendered":"http:\/\/itteacheritfreelance.hk\/test\/wordpress\/?guid=9a0b7061b2a5f8999973019ddf99ff3f"},"modified":"2019-08-16T00:36:00","modified_gmt":"2019-08-15T16:36:00","slug":"java-challengers-4-comparing-java-objects-with-equals-and-hashcode","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/2019\/08\/16\/java-challengers-4-comparing-java-objects-with-equals-and-hashcode\/","title":{"rendered":"Java Challengers #4: Comparing Java objects with equals() and hashcode()"},"content":{"rendered":"<article>\n<section class=\"page\">\n<p>In this <strong>Java Challenger<\/strong> you\u2019ll learn how <code>equals()<\/code> and <code>hashcode()<\/code> combine to make object comparisons efficient and easy in your Java programs. Simply put, these methods work together to verify if two objects have the same values. \u00a0<\/p>\n<p>Without <code>equals()<\/code> and <code>hashcode()<\/code> we would have to create very large &#8220;<code>if<\/code>&#8221; comparisons, comparing every field from an object. This would make code really confusing and hard to read. Together, these two methods help us create more flexible and cohesive code.<\/p>\n<aside class=\"sidbar\">\n<p>Get the <a href=\"https:\/\/github.com\/rafadelnero\/javaworld-challengers\" rel=\"nofollow\">Java Challengers source code<\/a>.<\/p>\n<p class=\"jumpTag\"><a href=\"https:\/\/www.javaworld.com\/article\/3305792\/java-challengers-4-comparing-java-objects-with-equals-and-hashcode.html#jump\">To read this article in full, please click here<\/a><\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<article>\n<section>\n<p>In this <strong>Java Challenger<\/strong> you&rsquo;ll learn how <code>equals()<\/code> and <code>hashcode()<\/code> combine to make object comparisons efficient and easy in your Java programs. Simply put, these methods work together to verify if two objects have the same values. &nbsp;<\/p>\n<p>Without <code>equals()<\/code> and <code>hashcode()<\/code> we would have to create very large &#8220;<code>if<\/code>&#8221; comparisons, comparing every field from an object. This would make code really confusing and hard to read. Together, these two methods help us create more flexible and cohesive code.<\/p>\n<aside>\n<p>Get the <a href=\"https:\/\/github.com\/rafadelnero\/javaworld-challengers\" rel=\"nofollow\">Java Challengers source code<\/a>.<\/p>\n<p><a href=\"https:\/\/www.javaworld.com\/article\/3305792\/java-challengers-4-comparing-java-objects-with-equals-and-hashcode.html#jump\">To read this article in full, please click here<\/a><\/p>\n<\/aside>\n<\/section>\n<\/article>\n<p> <a href=\"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/2019\/08\/16\/java-challengers-4-comparing-java-objects-with-equals-and-hashcode\/\">\u95b1\u8b80\u5168\u6587 <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":169,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"slim_seo":[],"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[451,2,7],"tags":[398,402,397,414,413,410,409,407,408,406,399,400,394,318,558,560,555,561,566,553,554,586,585,563,562,183,567,524,10,401,396,403,412,411,395,405,404,457,454,319,316],"jetpack_publicize_connections":[],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p7prtj-EHb","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts\/156437"}],"collection":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/users\/169"}],"replies":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/comments?post=156437"}],"version-history":[{"count":1,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts\/156437\/revisions"}],"predecessor-version":[{"id":156438,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts\/156437\/revisions\/156438"}],"wp:attachment":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/media?parent=156437"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/categories?post=156437"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/tags?post=156437"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}