{"id":25771,"date":"2024-03-16T05:33:16","date_gmt":"2024-03-16T05:33:16","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/"},"modified":"2024-03-22T06:58:38","modified_gmt":"2024-03-22T06:58:38","slug":"how-to-iterate-through-a-hashmap","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/","title":{"rendered":"How to iterate through a hashmap?"},"content":{"rendered":"

In Java, you can traverse a HashMap using the following method:<\/p>\n

    \n
  1. return a set of keys<\/li>\n
  2. iterate over each element<\/li>\n<\/ol>\n
    HashMap<String, Integer> hashMap = new<\/span> HashMap<\/span><>();\r\n\/\/ \u6dfb\u52a0\u952e\u503c\u5bf9<\/span>\r\nhashMap.put(\"A\"<\/span>, 1<\/span>);\r\nhashMap.put(\"B\"<\/span>, 2<\/span>);\r\nhashMap.put(\"C\"<\/span>, 3<\/span>);\r\n\r\n\/\/ \u904d\u5386<\/span>\r\nfor<\/span> (String key : hashMap.keySet()) {\r\n    Integer<\/span> value<\/span> =<\/span> hashMap.get(key);\r\n    System.out.println(key + \": \"<\/span> + value);\r\n}\r\n<\/code><\/pre>\n
      \n
    1. return a list of all the values in the dictionary<\/li>\n
    2. go through each individual item<\/li>\n<\/ol>\n
      HashMap<String, Integer> hashMap = new<\/span> HashMap<\/span><>();\r\n\/\/ \u6dfb\u52a0\u952e\u503c\u5bf9<\/span>\r\nhashMap.put(\"A\"<\/span>, 1<\/span>);\r\nhashMap.put(\"B\"<\/span>, 2<\/span>);\r\nhashMap.put(\"C\"<\/span>, 3<\/span>);\r\n\r\n\/\/ \u904d\u5386<\/span>\r\nfor<\/span> (Integer value : hashMap.values()) {\r\n    System.out.println(value);\r\n}\r\n<\/code><\/pre>\n
        \n
      1. Returns a set view of the mappings contained in this map.<\/li>\n
      2. iterate over each item<\/li>\n<\/ol>\n
        HashMap<String, Integer> hashMap = new<\/span> HashMap<\/span><>();\r\n\/\/ \u6dfb\u52a0\u952e\u503c\u5bf9<\/span>\r\nhashMap.put(\"A\"<\/span>, 1<\/span>);\r\nhashMap.put(\"B\"<\/span>, 2<\/span>);\r\nhashMap.put(\"C\"<\/span>, 3<\/span>);\r\n\r\n\/\/ \u904d\u5386<\/span>\r\nfor<\/span> (Map.Entry<String, Integer> entry : hashMap.entrySet()) {\r\n    String<\/span> key<\/span> =<\/span> entry.getKey();\r\n    Integer<\/span> value<\/span> =<\/span> entry.getValue();\r\n    System.out.println(key + \": \"<\/span> + value);\r\n}\r\n<\/code><\/pre>\n
        These methods can be selected based on specific needs. Traversing by key can retrieve both the key and value, traversing by value can only retrieve the value, and using the Entry collection for traversal allows for the retrieval of both the key and value simultaneously.<\/p>\n","protected":false},"excerpt":{"rendered":"
        In Java, you can traverse a HashMap using the following method: return a set of keys iterate over each element HashMap<String, Integer> hashMap = new HashMap<>(); \/\/ \u6dfb\u52a0\u952e\u503c\u5bf9 hashMap.put(“A”, 1); hashMap.put(“B”, 2); hashMap.put(“C”, 3); \/\/ \u904d\u5386 for (String key : hashMap.keySet()) { Integer value = hashMap.get(key); System.out.println(key + “: ” + value); } return a […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-25771","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to iterate through a hashmap? - Blog - Silicon Cloud<\/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.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to iterate through a hashmap?\" \/>\n<meta property=\"og:description\" content=\"In Java, you can traverse a HashMap using the following method: return a set of keys iterate over each element HashMap<String, Integer> hashMap = new HashMap<>(); \/\/ \u6dfb\u52a0\u952e\u503c\u5bf9 hashMap.put("A", 1); hashMap.put("B", 2); hashMap.put("C", 3); \/\/ \u904d\u5386 for (String key : hashMap.keySet()) { Integer value = hashMap.get(key); System.out.println(key + ": " + value); } return a […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T05:33:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T06:58:38+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin Taylor\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin Taylor\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/\"},\"author\":{\"name\":\"Benjamin Taylor\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/ac801fe9549a25960ce48aa2e0a691c9\"},\"headline\":\"How to iterate through a hashmap?\",\"datePublished\":\"2024-03-16T05:33:16+00:00\",\"dateModified\":\"2024-03-22T06:58:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/\"},\"wordCount\":101,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-iterate-through-a-hashmap\/\",\"name\":\"How to iterate through a hashmap? 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