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introduction

In the process of software development, we often need to deal with data collections. Although the Java standard library provides a rich collection class, such asList、SetandMapHowever, in certain application scenarios, these standard collections may not meet all requirements. In this case, custom collection implementation becomes particularly important. This article will introduce in detail how to implement custom collection classes according to specific requirements and provide code examples.

Collections Framework Overview

1. Collection Types

The Java collection framework mainly includes three data structures: List, Set and Map.

2. Collection Interface

• List：The elements are ordered and repeatable.
• Set: Elements are unordered and cannot be repeated.
• Map: Key-value pair, key is unique.

3. Collection Implementation

Standard implementations includeArrayList、LinkedList、HashSet、TreeSet、HashMapandTreeMapwait.

Why do you need a custom collection?

1. Specific data characteristics

When the data has special characteristics that cannot be effectively expressed or processed by standard sets.

2. Performance Optimization

Optimizations for specific operations, such as fast lookups, insertions, and deletions.

3. Specific Behavior

You need to add specific business logic or behavior to collection operations.

4. Scalability

The standard set needs to be extended to add additional functionality.

Steps to implement custom collections

1. Define the collection interface

Determine the interface that the collection needs to implement, such asList、