{"id":211935,"date":"2025-05-20T11:54:39","date_gmt":"2025-05-20T11:54:39","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/"},"modified":"2025-05-20T11:54:39","modified_gmt":"2025-05-20T11:54:39","slug":"does-putting-multiple-keys-in-a-hashmap-change-the-value","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/","title":{"rendered":"Does putting multiple keys in a HashMap change the value?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#Does_putting_multiple_keys_in_a_HashMap_change_the_value\" title=\"Does putting multiple keys in a HashMap change the value?\">Does putting multiple keys in a HashMap change the value?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#FAQs_about_HashMap\" title=\"FAQs about HashMap:\">FAQs about HashMap:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#1_Can_a_HashMap_contain_duplicate_keys\" title=\"1. Can a HashMap contain duplicate keys?\">1. Can a HashMap contain duplicate keys?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#2_What_happens_if_we_put_a_null_key_in_a_HashMap\" title=\"2. What happens if we put a null key in a HashMap?\">2. What happens if we put a null key in a HashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#3_Can_we_have_multiple_null_values_in_a_HashMap\" title=\"3. Can we have multiple null values in a HashMap?\">3. Can we have multiple null values in a HashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#4_How_does_HashMap_handle_collisions\" title=\"4. How does HashMap handle collisions?\">4. How does HashMap handle collisions?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#5_Is_HashMap_thread-safe\" title=\"5. Is HashMap thread-safe?\">5. Is HashMap thread-safe?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#6_How_does_HashMap_ensure_fast_retrieval_of_values\" title=\"6. How does HashMap ensure fast retrieval of values?\">6. How does HashMap ensure fast retrieval of values?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#7_What_happens_if_we_try_to_get_a_value_for_a_key_that_does_not_exist_in_the_HashMap\" title=\"7. What happens if we try to get a value for a key that does not exist in the HashMap?\">7. What happens if we try to get a value for a key that does not exist in the HashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#8_Can_we_iterate_over_the_keys_in_a_HashMap\" title=\"8. Can we iterate over the keys in a HashMap?\">8. Can we iterate over the keys in a HashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#9_What_is_the_difference_between_HashMap_and_LinkedHashMap\" title=\"9. What is the difference between HashMap and LinkedHashMap?\">9. What is the difference between HashMap and LinkedHashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#10_Can_we_use_custom_objects_as_keys_in_a_HashMap\" title=\"10. Can we use custom objects as keys in a HashMap?\">10. Can we use custom objects as keys in a HashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#11_How_do_you_remove_a_key-value_pair_from_a_HashMap\" title=\"11. How do you remove a key-value pair from a HashMap?\">11. How do you remove a key-value pair from a HashMap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#12_What_is_the_time_complexity_of_basic_operations_in_a_HashMap\" title=\"12. What is the time complexity of basic operations in a HashMap?\">12. What is the time complexity of basic operations in a HashMap?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Does_putting_multiple_keys_in_a_HashMap_change_the_value\"><\/span>Does putting multiple keys in a HashMap change the value?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>**No, putting multiple keys in a HashMap does not change the value associated with any key. A HashMap in Java is designed to store key-value pairs, where each key is unique and maps to a single value.**<\/p>\n<p>HashMap is a data structure in Java that allows us to store key-value pairs. Each key in a HashMap must be unique, as it is used to retrieve the associated value. When we put multiple keys in a HashMap, each key is stored along with its corresponding value, and retrieving the value is based on the specified key.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FAQs_about_HashMap\"><\/span>FAQs about HashMap:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_Can_a_HashMap_contain_duplicate_keys\"><\/span>1. Can a HashMap contain duplicate keys?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, a HashMap cannot contain duplicate keys. If you try to add a key that already exists in the HashMap, the new value will replace the old one.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_What_happens_if_we_put_a_null_key_in_a_HashMap\"><\/span>2. What happens if we put a null key in a HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA HashMap can only have one null key. If you try to put another null key, it will overwrite the existing one.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Can_we_have_multiple_null_values_in_a_HashMap\"><\/span>3. Can we have multiple null values in a HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, a HashMap can have multiple null values associated with different keys.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_does_HashMap_handle_collisions\"><\/span>4. How does HashMap handle collisions?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nHashMap uses a technique called chaining to handle collisions. When two keys hash to the same index, a linked list of entries is created at that index to store the key-value pairs.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Is_HashMap_thread-safe\"><\/span>5. Is HashMap thread-safe?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, HashMap is not thread-safe. If multiple threads access a HashMap concurrently, it can lead to data corruption or inconsistent results. To make it thread-safe, you can use ConcurrentHashMap.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_How_does_HashMap_ensure_fast_retrieval_of_values\"><\/span>6. How does HashMap ensure fast retrieval of values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nHashMap uses a hashing technique to index keys, allowing for constant-time retrieval of values on average. This makes HashMap suitable for scenarios where quick lookups are required.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_What_happens_if_we_try_to_get_a_value_for_a_key_that_does_not_exist_in_the_HashMap\"><\/span>7. What happens if we try to get a value for a key that does not exist in the HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf you try to retrieve a value for a key that does not exist in the HashMap, it will return null.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Can_we_iterate_over_the_keys_in_a_HashMap\"><\/span>8. Can we iterate over the keys in a HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can iterate over the keys in a HashMap using methods like keySet() or entrySet().<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_What_is_the_difference_between_HashMap_and_LinkedHashMap\"><\/span>9. What is the difference between HashMap and LinkedHashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nHashMap does not maintain any order of the elements, while LinkedHashMap maintains the order of insertion.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Can_we_use_custom_objects_as_keys_in_a_HashMap\"><\/span>10. Can we use custom objects as keys in a HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use custom objects as keys in a HashMap as long as they correctly implement the equals() and hashCode() methods.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_How_do_you_remove_a_key-value_pair_from_a_HashMap\"><\/span>11. How do you remove a key-value pair from a HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can remove a key-value pair from a HashMap using the remove() method by specifying the key to be removed.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_What_is_the_time_complexity_of_basic_operations_in_a_HashMap\"><\/span>12. What is the time complexity of basic operations in a HashMap?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe time complexity of basic operations in a HashMap, such as get() and put(), is O(1) on average. This means that these operations have constant time complexity, making HashMap efficient for lookups and inserts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Does putting multiple keys in a HashMap change the value? **No, putting multiple keys in a HashMap does not change the value associated with any key. A HashMap in Java is designed to store key-value pairs, where each key is unique and maps to a single value.** HashMap is a data structure in Java that &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Does putting multiple keys in a HashMap change the value?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/does-putting-multiple-keys-in-a-hashmap-change-the-value\/#more-211935\">Read more<span class=\"screen-reader-text\">Does putting multiple keys in a HashMap change the value?<\/span><\/a><\/p>\n","protected":false},"author":53,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-211935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Does putting multiple keys in a HashMap change the value?<\/title>\n<meta name=\"description\" content=\"Does putting multiple keys in a HashMap change the value? **No, putting multiple keys in a HashMap does not change the value associated with any key. 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