{"id":5731,"date":"2022-09-01T11:30:43","date_gmt":"2022-09-01T06:00:43","guid":{"rendered":"https:\/\/btechgeeks.com\/?p=5731"},"modified":"2022-09-01T11:49:51","modified_gmt":"2022-09-01T06:19:51","slug":"how-to-search-for-an-element-in-hashset-in-java","status":"publish","type":"post","link":"https:\/\/btechgeeks.com\/how-to-search-for-an-element-in-hashset-in-java\/","title":{"rendered":"Java hashset contains &#8211; How to Search for an Element in HashSet in Java? | HashSet contains() Method Implementation in Java"},"content":{"rendered":"<p><strong>Java hashset contains: <\/strong>The HashSet class implements the Set interface and is supported by a hash table, which is a HashMap instance. The null element is allowable in this class. The class also provides continuous time for basic operations like adding, removing, containing, and size provided that the Hash function correctly distributes the elements between the buckets.<\/p>\n<p>In this tutorial we will explain all about how to Search for an Element in a HashSet using Contains() method. Refer to the Programs that Checks Whether a Specific Element is present in Hashet or not. Given a HashSet, the task is to search for an element in HashSet.<\/p>\n<p><strong>Example:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given hashset elements : { 'hello' , 'this' , 'is', 'BTechGeeks' , 'is', 'platform' }\u00a0 \u00a0search_element ='BTechGeeks'<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>The given hashset contains BTechGeeks element in it.<\/pre>\n<ul>\n<li><a href=\"#How_to_Search_for_an_Element_in_HashSet_in_Java?\">How to Search for an Element in HashSet in Java?<\/a><\/li>\n<li><a href=\"#HashSet_contains()_Method_in_Java\">HashSet contains() Method in Java<\/a><\/li>\n<li><a href=\"#Example_Program_Implementing_the_Java.util.HashSet.contains()_method\">Example Program Implementing the Java.util.HashSet.contains() method<\/a><\/li>\n<li><a href=\"#Example_to_Check_if_an_Item_Exists_in_HashSet_or_Not\">Example to Check if an Item Exists in HashSet or Not<\/a><\/li>\n<\/ul>\n<h2><a id=\"How_to_Search_for_an_Element_in_HashSet_in_Java?\"><\/a>How to Search for an Element in HashSet in Java?<\/h2>\n<p><strong>Hashset contains java: <\/strong>A HashSet&#8217;s main feature is fast searching. This is accomplished through the use of Hashing. Assume we want to see if an element in HashSet exists. It is possible to accomplish this by using HashSet&#8217;s contains() member function.<\/p>\n<h2><a id=\"HashSet_contains()_Method_in_Java\"><\/a>HashSet contains() Method in Java<\/h2>\n<p><strong>Hashset contains: <\/strong>The Java.util.HashSet.contains() method is used to determine whether or not a specific element exists in the HashSet. So, in essence, it is used to determine whether a Set contains a specific element or not.<\/p>\n<p><strong>Syntax:<\/strong><\/p>\n<pre>given_hashSet.contains(Object element)<\/pre>\n<p><strong>Parameters:<\/strong><\/p>\n<pre>HashSet is the type of the parameter element. This is the element that must be checked to see if it is present in the set.<\/pre>\n<p><strong>Return:<\/strong><\/p>\n<pre>If the element is present in the set, the method returns true otherwise, it returns False.<\/pre>\n<p>Also, See:<\/p>\n<ul>\n<li><a href=\"https:\/\/btechgeeks.com\/how-to-create-and-add-elements-in-a-hashset-in-java\/\">How to Create and Add elements in a HashSet in Java<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/hashset-class-in-java-with-example\/\">HashSet Class in Java with Example<\/a><\/li>\n<\/ul>\n<h2><a id=\"Example_Program_Implementing_the_Java.util.HashSet.contains()_method\"><\/a>Example Program Implementing the Java.util.HashSet.contains() method<\/h2>\n<pre>\/\/ Java code to illustrate HashSet.contains() method\r\nimport java.io.*;\r\nimport java.util.HashSet;\r\n\r\npublic class HashSetDemo {\r\npublic static void main(String args[])\r\n{\r\n\/\/ Creating an empty HashSet\r\nHashSet&lt;String&gt; set = new HashSet&lt;String&gt;();\r\n\r\n\/\/ Using add() method to add elements into the Set\r\nset.add(\"Welcome\");\r\nset.add(\"To\");\r\nset.add(\"Geeks\");\r\nset.add(\"4\");\r\nset.add(\"Geeks\");\r\n\r\n\/\/ Displaying the HashSet\r\nSystem.out.println(\"HashSet: \" + set);\r\n\r\n\/\/ Check for \"Geeks\" in the set\r\nSystem.out.println(\"Does the Set contains 'Geeks'? \" + set.contains(\"Geeks\"));\r\n\r\n\/\/ Check for \"4\" in the set\r\nSystem.out.println(\"Does the Set contains '4'? \" + set.contains(\"4\"));\r\n\r\n\/\/ Check if the Set contains \"No\"\r\nSystem.out.println(\"Does the Set contains 'No'? \" + set.contains(\"No\"));\r\n}\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>HashSet: [4, Geeks, Welcome, To]\r\nDoes the Set contains 'Geeks'? true\r\nDoes the Set contains '4'? true\r\nDoes the Set contains 'No'? false<\/pre>\n<p>It will first determine the Hash Code of the given object. Then, based on that hash code, it will go to a bucket and use the equals() member function to check all elements within the bucket.<\/p>\n<h2><a id=\"Example_to_Check_if_an_Item_Exists_in_HashSet_or_Not\"><\/a>Example to Check if an Item Exists in HashSet or Not<\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.io.*;\r\nimport java.lang.*;\r\nimport java.util.*;\r\n\r\nclass BtechGeeks {\r\n    public static void main(String[] args)\r\n        throws java.lang.Exception\r\n    {\r\n        \/\/ initailzing a hashset which is of type string\r\n        HashSet&lt;String&gt; stringset = new HashSet&lt;&gt;();\r\n        \/\/ adding elements to the hashset\r\n        stringset.add(\"hello\");\r\n        stringset.add(\"this\");\r\n        stringset.add(\"is\");\r\n        stringset.add(\"BTechGeeks\");\r\n        stringset.add(\"is\");\r\n        stringset.add(\"platform\");\r\n        \/\/ given element\r\n        String element = \"BTechGeeks\";\r\n        \/\/ looking for the given element in the hash set\r\n\r\n        if (stringset.contains(element)) {\r\n            System.out.println(\"The given hashset contains \"\r\n                               + element\r\n                               + \" element in it.\");\r\n        }\r\n        else {\r\n            System.out.println(\r\n                \"The given hashset doesn't contain \"\r\n                + element + \" element in it.\");\r\n        }\r\n    }\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>The given hashset contains BTechGeeks element in it.<\/pre>\n<p><strong>Explanation:<\/strong> Here BTechGeeks element is present in the given HashSet<br \/>\n<strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/btechgeeks.com\/how-to-search-an-element-in-unordered_set\/\">how to search an element in unordered_set<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/how-to-merge-an-array-in-a-hashset-in-java\/\">how to merge an array in a hashset in java<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/cpp-list-find-contains-how-to-search-an-element-in-stdlist\/\">cpp list find contains how to search an element in stdlist<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/python-how-to-add-an-element-in-list-append-vs-extend\/\">python how to add an element in list append vs extend<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/python-how-to-insert-an-element-at-specific-index-in-list\/\">python how to insert an element at specific index in list<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/how-to-find-string-length-in-java-using-length-method\/\">how to find string length in java using length method<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/how-to-concatenate-two-strings-using-concat-method-in-java\/\">how to concatenate two strings using concat method in java<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Java hashset contains: The HashSet class implements the Set interface and is supported by a hash table, which is a HashMap instance. The null element is allowable in this class. The class also provides continuous time for basic operations like adding, removing, containing, and size provided that the Hash function correctly distributes the elements between &#8230; <a title=\"Java hashset contains &#8211; How to Search for an Element in HashSet in Java? | HashSet contains() Method Implementation in Java\" class=\"read-more\" href=\"https:\/\/btechgeeks.com\/how-to-search-for-an-element-in-hashset-in-java\/\" aria-label=\"More on Java hashset contains &#8211; How to Search for an Element in HashSet in Java? | HashSet contains() Method Implementation in Java\">Read more<\/a><\/p>\n","protected":false},"author":7,"featured_media":5737,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[15],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java hashset contains - How to Search for an Element in HashSet in Java? | HashSet contains() Method Implementation in Java - BTech Geeks<\/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:\/\/btechgeeks.com\/how-to-search-for-an-element-in-hashset-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java hashset contains - How to Search for an Element in HashSet in Java? | HashSet contains() Method Implementation in Java - BTech Geeks\" \/>\n<meta property=\"og:description\" content=\"Java hashset contains: The HashSet class implements the Set interface and is supported by a hash table, which is a HashMap instance. 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