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catalogue Overview and use of generics Why are there generics? Generic statement definition format Benefits of generics Generic application Generic class generic method generic interface ​Generic advanced (wildcard) Overview and use of enhanced for Enhanced for Overview Enhanced for recycling Overview and use of static impo ...

1, Cache conceptual knowledge 1. What cache is it The word Cache is often heard in daily life. What is Cache? In fact, Cache is the buffer of data exchange (called Cache), which is the place where data (frequently used data) is temporarily stored. When users query data, they first look for it in the Cache. If they find it, they will execu ...

Map collection Features of Map interface Used to store any key value pairKey: no repetition, no subscriptValue: unordered, no subscript, duplicate allowed Common methods of Map interface V get(Object key): returns the value corresponding to the specified key object in the Map set. V indicates the data type of the valueV put(K key, V va ...

In the previous article, I introduced the DispatcherServlet, the core component of Spring MVC. DispatcherServlet connects the requests in the Servlet container (such as Tomcat) with the components in Spring and is the hub of Spring web applications. However, in our daily development, we often do not need to know the role of the hub in detail. W ...

preface This article is compiled from the notes in the process of personal learning and review, which is suitable for readers to get started and review quickly. 1, Classes and objects Class 1.1 A class is a class. A class creation object is our commonly used new object 1.2 reference type In addition to the eight basic types of dat ...

preface java.util.concurrent.atomic also provides some concurrency tool classes, which are divided into five categories: Update base types atomically AtomicInteger: integer atomic classAtomicLong: long integer atomic classAtomicBoolean: Boolean atomic class Atomic referenceAtomic arrayField UpdaterAtomic accumulator 1. Atomic integer Tak ...

Eight methods of List collection object de duplication and attribute de duplication - Fage talk Java - blog Garden 1, Outline of this paper In this article, I want to write about eight methods of de duplication of List set elements. In fact, through flexible application, arrangement and combination, there are not necessarily eight, but there ...

Basic concept and function of array java array stores a group of data with the same data type. The space in memory is continuous. Once the length is given, it cannot be changed Arrays are reference data types (objects), but they can store basic types or reference types Array creation Declaration array Int means that the data type that can ...

Request de duplication This is a high-frequency interview question for reptile post: Q: How does the sweep remove duplicate requests? What is the de duplication principle? How does the request calculate uniqueness? With this question, enter today's theme. DUPEFILTER_CLASS In the scene project configuration, DUPEFILTER_CLASS is the setting ...

540. A single element in an ordered array 2022.2.14 one question per day Title Description Give you an ordered array of integers, where each element will appear twice and only one number will appear once. Please find and return the number that appears only once. The solution you design must meet O(log n) time complexity and O(1) space comp ...