{"componentChunkName":"component---packages-blog-core-src-templates-post-js","path":"/hashmap-fundamentals-in-java/","result":{"data":{"post":{"__typename":"MdxArticleProxy","id":"1bb6ec1f-f692-5595-8d41-f893a7d3ff4a","title":"HashMap Fundamentals in Java","slug":"/hashmap-fundamentals-in-java/","link":null,"excerpt":"What is a HashMap HashMap is one many data structures in programming. 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It stores data in key-value format.\\nLike, name can be key and value can be the actual value.\\nHashMap can be thought of an special case of Array.\\nArrays also store values using key-value pair, the only thing is, in Array we have different form of key (indexes - 0, 1, 2..).\"), mdx(\"h3\", {\n    \"id\": \"how-to-declare-hashmap\"\n  }, \"How to declare HashMap\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"HashMap<String, String> map = new HashMap<>();\\n\")), mdx(\"h3\", {\n    \"id\": \"store-values-in-the-hashmap\"\n  }, \"Store values in the HashMap\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"map.put(\\\"name\\\", \\\"Arvind Pandey\\\");\\nmap.address(\\\"address\\\", \\\"Hyderabad\\\");\\nSystem.out.println(map); // Prints => {address=Hyderabad, name=Arvind Pandey}\\n\")), mdx(\"h3\", {\n    \"id\": 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HashMap.\"), mdx(\"h3\", {\n    \"id\": \"print-all-the-keys\"\n  }, \"Print all the keys\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"for(String key: map.keySet()) {\\n  System.out.println(key+ \\\", \\\"); // Prints => address, name\\n}\\n\")), mdx(\"h3\", {\n    \"id\": \"print-all-the-values\"\n  }, \"Print all the values\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"for(String value: map.values()) {\\n  System.out.print(value+\\\", \\\"); // Prints => Hyderabad, Arvind Pandey\\n}\\n\")), mdx(\"h3\", {\n    \"id\": \"print-all-key-value-pairs\"\n  }, \"Print all key-value pairs\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"for(String key: map.keySet()) {\\n  System.out.print(\\\"key: \\\"+key+\\\", value: \\\"+map.get(key)); // Prints key:value pair on different line\\n}\\n\")), mdx(\"h3\", {\n    \"id\": \"one-more-way-to-loop-through-hashmap\"\n  }, \"One more way to loop through HashMap\"), mdx(\"p\", null, \"There is another way to loop over HashMap, using iterator.\"), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"Iterator itr = map.entrySet().iterator();\\nwhile(itr.hasNext()) {\\n  System.out.println(itr.next()); // Prints key=value pair on different line\\n}\\n\")), mdx(\"p\", null, \"That\\u2019s pretty much a very fundamental level about HashMap.\"), mdx(\"p\", null, \"Hope you liked this tutorial.\\nYou might also like other tutorials in this series \", mdx(\"a\", {\n    href: \"/data-structure-fundamentals-in-java\"\n  }, \"here\")));\n}\n;\nMDXContent.isMDXComponent = 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