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In depth analysis of the source code design of CopyOnWriteArrayList CopyOnWriteArrayList provides thread safety and scalability Scalability refers to the performance of an application's throughput as its workload and available processing resources increase. A scalable program can handle a larger workload by using more processors, memory, ...

First, ArrayList and linkedlist are implementation classes of the List interface, and both are thread unsafe ArrayList and linkedlist 1.ArrayList uses dynamic array to store data, and linkedlist uses bidirectional list to store data. 2.ArrayList can be accessed randomly through the address, and linkedlist can only be accessed by moving the p ...

Main differences between Set and List Duplicate elements are allowed to be inserted in the List, while duplicate elements are not allowed in the Set.Related to the storage order of elements, List is an ordered Set, which will retain the order in which elements are inserted, and Set is an unordered Set.List can be accessed by subscript, but Set ...

Collection classes are stored in Java There are three main types of util package: set, list and map Collection: collection is the most basic interface of collection List, Set and QueueMap: is the basic interface of the mapping table 1, Collection List is an ordered Collection. List has three implementation classes: ArrayList, Vecto ...

ArrayList 1 Introduction It inherits from AbstractList and implements the List interface. The bottom layer realizes the dynamic change of capacity based on array. null is not allowed. At the same time, RandomAccess, Cloneable and Serializable interfaces are also implemented, so ArrayList supports fast access, replication and serializ ...

introduction When using the collection ArrayList, you often use add, remove, etc. there are many others you haven't used or even heard of Now in this tutorial, simply understand it. You don't need to write it all down It's equivalent to building an index in your head, that is, when some methods are used, don't build wheels repeatedly The Arr ...

Collection, generic, List, Collections, Set, Map 1, Collection collection 1.1 collection overview Collection: a collection is a container provided in java that can be used to store multiple data. Differences between sets and arrays: The length of the array is fixed. The length of the collection is variable.The elements of the same type are ...

Handwritten ArrayList using Java Almost all languages have arrays, and Java is no exception. The characteristic of array is that the length must be determined during initialization. Even if the capacity reaches, it cannot be automatically expanded to meet the requirements, Therefore, we can use the dynamic array (ArrayList) to realize the arra ...

1, Overview of classes and interfaces Advantages and functions of Java collection framework Using a mature collection framework helps us write efficient and stable code conveniently and quicklyLearning the data structure knowledge behind it will help us understand the advantages, disadvantages and usage scenarios of each collection ...

ArrayList analysis of JDK collection source code (with an example of interview questions) 1. ArrayList inheritance system ArrayList is also called dynamic array. The bottom layer is a List based on array. The difference between ArrayList and array is that it has the ability of dynamic expansion. As can be seen from the inheritance system diag ...