Programmer Think

ArryList underlying data structure and common method source code understanding 1. First look at a test code package com.heyuanhang.conllention_; import java.util.ArrayList; /** * @Author He Yuanhang * @Date: 2021/4/17 12:57 * @Version 1.8 */ public class ArrayListYuanMa { public static void main(String[] args){ //The paramet ...

Student Management System (ArrayList Simple Edition) Ideas for Implementing Student Management System (1) Defining student classes (2) Coding of the main interface (3) Code writing for adding students (4) View students'code writing Delete student code writing Modify students'code writing Solve the problem of adding duplicate student num ...

After so much preparation, it finally started. Ha, ArrayList Kaigan! ArrayList should be the most frequently used collection class. Let's take a look at how the document introduces it. We can know that ArrayList is actually a replica of Vector, but it only removes thread safety. ArrayList is a List implementation that can be dynamically resize ...

prefaceArrayList is a List implemented by array. Compared with array, it has the ability of dynamic expansion, so it can also be called dynamic array.Any type of data can be stored in the ArrayList collection, and it is a sequential container. The order of stored data is consistent with the order we put it in, and it also allows us to put null ...

1, Collection Features of collection class: it provides a storage type with variable storage space, and the stored data capacity can be changed at any time Collection collection overview Is the top-level interface of a single column Collection. It represents a set of objects, which are also called Collection elementsJDK does not provide an ...

1, Overview Recently, I want to change my job. I interviewed several people before. I feel that both sides don't see each other very much. I'm 40 years old. It's almost the end of the year. I'd better do some preparatory work. It's hard to find a job. I was not ready to find information on the Internet. I happened to see the "Huawei Danie ...

catalogue 1, System introduction 1. Development environment 2. Technical selection 3. System functions 4. Access to resources 2, System display   1. Log in to the system 2. Query pet information 3. Add pet information 4. Update pet information 5. Delete pet information 3, Partial code BusinessService LoginService   4, O ...

10.15 analysis of ArrayList collection source code The code used for the test is as follows public static void main(String[] args) { List list = new ArrayList(); for (int i = 0; i < 10; i++) { list.add(i); } list.add(20); list.add(30); list.add(40); } First, create an ...