投稿時間:2023-06-30 13:11:34 RSSフィード2023-06-30 13:00 分まとめ(13件)

カテゴリー等	サイト名等	記事タイトル・トレンドワード等	リンクURL	頻出ワード・要約等/検索ボリューム	登録日
IT	気になる、記になる…	Anker、コンパクト・容量10000mAh・30W出力が特徴の新型モバイルバッテリー｢Anker Power Bank (10000mAh, 30W)｣を発売	https://taisy0.com/2023/06/30/173499.html	anker	2023-06-30 03:20:10
IT	ITmedia 総合記事一覧	[ITmedia News] ファミマにTeslaの充電器　コンビニ初、「スーパーチャージャー」設置	https://www.itmedia.co.jp/news/articles/2306/30/news137.html	itmedia	2023-06-30 12:30:00
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] よく使うクレジットカード　3位「イオン」、2位「三井住友」、1位は？	https://www.itmedia.co.jp/business/articles/2306/30/news124.html	itmedia	2023-06-30 12:30:00
IT	ITmedia 総合記事一覧	[ITmedia PC USER] サードウェーブ、GeForce RTX 4060搭載のゲーミング/クリエイター向けデスクトップPCを販売開始	https://www.itmedia.co.jp/pcuser/articles/2306/30/news134.html	geforce	2023-06-30 12:13:00
TECH	Techable（テッカブル）	ACROVE、GMOイエラエと連携。増加する不正転売に対応し、ブランド力の低下を防ぐ	https://techable.jp/archives/213424	acrove	2023-06-30 03:00:57
python	Pythonタグが付けられた新着投稿 - Qiita	OpenAI GTP-4を使って日本語文からSurrealDB クエリを生成した話	https://qiita.com/tmarumaru/items/da030f7c5744cd42ab93	openaigtp	2023-06-30 12:37:06
Program	CodeZine	Microsoft、「Microsoft Graph CLI SDK v1.0.0-preview」のリリース候補を公開	http://codezine.jp/article/detail/17972	graphclisdkvpreview	2023-06-30 12:15:00
Program	CodeZine	バルテス・モバイルテクノロジー、体験型メタバースプラットフォーム「VMVerse」を公開	http://codezine.jp/article/detail/17973	vmverse	2023-06-30 12:15:00
技術ブログ	Developers.IO	Notionを更新する際に伝えたいことが伝わるようにするために #Notion	https://dev.classmethod.jp/articles/how-to-notice-page-update-on-notion/	notion	2023-06-30 03:37:13
技術ブログ	Developers.IO	ダミーファイルを生成するfaker-fileを使ってみた	https://dev.classmethod.jp/articles/faker-file-for-generating-dummy-files/	bodybyrings	2023-06-30 03:12:39
海外TECH	DEV Community	Understanding Hashing in Java: Exploring HashMap and HashSet	https://dev.to/aswin2001barath/understanding-hashing-in-java-exploring-hashmap-and-hashset-ea	Understanding Hashing in Java Exploring HashMap and HashSetHashing is a fundamental concept in computer science and plays a crucial role in efficient data storage and retrieval In this blog post we will explore hashing in the context of Java programming language focusing on two important classes HashMap and HashSet We ll cover the basics of hashing explain the purpose and usage of HashMap and HashSet provide Java syntax examples showcase practical use cases and discuss problem solving patterns So let s dive in What is Hashing Hashing is a technique used to map data to a fixed size value known as a hash code or hash It takes an input performs some calculations on it and produces a unique hash code The resulting hash code is used as an index or key to store or retrieve data in a data structure What is HashMap HashMap is a class in Java s Collections framework that implements the Map interface It provides a way to store key value pairs where each key is unique The keys are hashed to generate hash codes which are then used to index and store the corresponding values HashMap allows for efficient retrieval and modification of data Java Syntax for HashMap To create a HashMap in Java you need to import the java util HashMap class Here s the syntax for creating a HashMap import java util HashMap HashMap lt KeyType ValueType gt map new HashMap lt gt The KeyType represents the data type of the keys and ValueType represents the data type of the values Important Methods in HashMap put key value Inserts a key value pair into the HashMap get key Retrieves the value associated with the specified key containsKey key Checks if the HashMap contains a specific key containsValue value Checks if the HashMap contains a specific value remove key Removes the key value pair associated with the specified key size Returns the number of key value pairs in the HashMap Java Example for HashMap Let s consider an example where we store the ages of individuals using their names as keys in a HashMap import java util HashMap HashMap lt String Integer gt ageMap new HashMap lt gt ageMap put Alice ageMap put Bob ageMap put Charlie System out println ageMap get Alice Output In this example we create a HashMap ageMap with keys of type String and values of type Integer We store the ages of three individuals and retrieve Alice s age using her name as the key What is HashSet HashSet is another class in Java s Collections framework that implements the Set interface It represents a collection of unique elements where the order is not important HashSet uses hashing internally to store and retrieve elements efficiently Java Syntax for HashSet To create a HashSet in Java you need to import the java util HashSet class Here s the syntax import java util HashSet HashSet lt ElementType gt set new HashSet lt gt The ElementType represents the data type of the elements in the set Important Methods in HashSet add element Adds an element to the HashSet contains element Checks if the HashSet contains a specific element remove element Removes an element from the HashSet size Returns the number of elements in the HashSet Java Example for HashSet Let s consider an example where we store a list of unique names using a HashSet import java util HashSet HashSet lt String gt nameSet new HashSet lt gt nameSet add Alice nameSet add Bob nameSet add Charlie System out println nameSet contains Alice Output trueIn this example we create a HashSet nameSet with elements of type String We add three unique names and check if Alice exists in the set using the contains method Practical Use Cases of HashMap and HashSet Data Indexing HashMap is commonly used for efficient indexing and retrieval of data based on unique keys For example it can be used to store user profiles with usernames as keys Eliminating Duplicates HashSet is useful for removing duplicate elements from a collection It can be used to filter unique values from a list or to check for the presence of duplicates Caching HashMap can be employed asa cache mechanism where expensive calculations or database queries can be stored and retrieved quickly using unique keys Problem Solving Patterns with HashMap and HashSet Frequency Counting HashMap can be utilized to count the frequency of elements in a list or string It is helpful in solving problems related to finding duplicates or analyzing character word occurrences Set Operations HashSet provides efficient set operations like union intersection and difference These operations are beneficial in solving problems related to finding common elements or distinct values Conclusion Hashing is a powerful technique that enables efficient storage and retrieval of data in Java HashMap and HashSet are two essential classes that leverage hashing to provide key value mapping and store unique elements respectively By understanding the concepts syntax practical use cases important methods and problem solving patterns of HashMap and HashSet you ll have a solid foundation to leverage these classes effectively in your Java projects Recommended Resources to Learn Data Structures and AlgorithmsBasics of DS Algo Blogs  Hashing in JavaRecommended YouTubers for LeetCode Problems  NeetCode  Take U ForwardFree Resources for Learning Data Structures and Algorithms  NeetCode Roadmap  Striver s SDE SheetRecommended Courses for Learning Data Structures and Algorithms NeetCode CoursesZTM Mastering the Coding Interview Big Tech Available on Udemy and ZTM AcademyZTM Mastering the Coding Interview Available on Udemy and ZTM AcademyData Structures amp Algorithms Level up for Coding Interviews CourseStriver s AZ Free CourseTop Coursera Courses for Learning Data Structures and Algorithms Coding Interview Preparation Meta Algorithms Course Part I Princeton University Algorithms Course Part II Princeton University Data Structures and Algorithms Specialization UC San Diego Algorithms Specialization Stanford Note The Coursera courses can be audited to get free access to the lectures Who Am I I m Aswin Barath a Software Engineering Nerd who loves building Web Applications now sharing my knowledge through Blogging during the busy time of my freelancing work life Here s the link to all of my craziness categorized by platforms under one place  Disclosure  Please note that some of the links mentioned on this page may be affiliate links This means that if you click on one of these links and make a purchase I may earn a small commission from the sale Keep LearningNow I guess this is where I say goodbye But hey it s time for you to start learning with your newfound Knowledge Power ‍‍ Good Job that you made it this far amp  Thank you so much for reading my Blog	2023-06-30 03:30:19
ビジネス	東洋経済オンライン	定番｢から揚げ｣をガラッと変えるハーブの使い方 ｢ハーブ＝面倒｣と思う人に教えたい簡単レシピ3選 | グルメ・レシピ | 東洋経済オンライン	https://toyokeizai.net/articles/-/682669?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2023-06-30 12:30:00
マーケティング	MarkeZine	Shopify Japan、エンターテインメント企業向けプログラムを開始　コマース起点でDXを支援	http://markezine.jp/article/detail/42648	shopifyjapan	2023-06-30 12:15:00