Table of Contents 1. Sequence table 2. Introduction to ArrayList 3. Use of ArrayList 3.1 Construction of ArrayList 3.2 Common operations on ArrayList 3.3 Traversal of ArrayList 3.4 ArrayList expansion mechanism Linear table: It is a finite sequence of n data elements with the same characteristics. Linear table is a data structure widely used in […]
Tag: arraylist
C# data structure–array and ArrayList
Table of Contents Contents of this chapter: 2.1 Basic concepts of arrays 2.1.1 Declaration and initialization of array 2.1.2 Setting and accessing array elements 2.1.4 Multidimensional array 2.1.5 Parameter array 2.2ArrayList class 2.2.1Members of the ArrayList class 2.2.2 Application of ArrayList class The difference between array and ArrayList and usage scenarios Array: ArrayList: (will cause […]
JUC high concurrency container-CopyOnWriteArrayList
CopyOnWriteArrayList JUC high concurrency container Thread-safe synchronization container class What is a high-concurrency container? CopyOnWriteArrayList JUC high concurrency container Thread-safe synchronization container class The Java synchronization container class uses Synchronized (built-in lock) to implement synchronized containers, such as Vector, HashTable and SynchronizedList and other containers. Thread-safe synchronization container classes mainly include Vector, Stack, HashTable, etc. […]
CTO: Anyone who uses Arrays.asList or ArrayList.subList in a project should get out immediately!
Author: Shencheng Stranger Source: blog.csdn.net/zwwhnly/article/details/109583990 # Notes on using Arrays.asList 1.1 Possible pitfalls Let’s first look at the use of Arrays.asList: List<Integer> statusList = Arrays.asList(1, 2); System.out.println(statusList); System.out.println(statusList.contains(1)); System.out.println(statusList.contains(3)); The output is as shown below: Then, add element 3 to statusList, as shown below: statusList.add(3); System.out.println(statusList.contains(3)); The expected result should be true, but actually a […]
Pitfalls of Arrays.asList and ArrayList.subList
1. Things to note when using Arrays.asList 1.1 Possible pitfalls Let’s first look at the use of Arrays.asList: List<Integer> statusList = Arrays.asList(1, 2);</code><code>System.out.println(statusList);</code><code>System.out.println(statusList.contains (1));</code><code>System.out.println(statusList.contains(3)); The output is as shown below: Then, add element 3 to statusList, as shown below: ? statusList.add(3);</code><code>System.out.println(statusList.contains(3)); The expected result should be to output true, but actually a java.lang.UnsupportedOperationException exception was […]
[ArrayList and LinkedList]
Article directory 1.ArrayList 2.LinkedList 2.1 Construction of LinkedList 3. Overall code 4. Test the code 1.ArrayList We know that List is an interface, and ArrayList is an implementation class of List interface.< /strong> Because interfaces cannot be instantiated directly, we can let a class implement the interface, and then let this class instantiate a reference […]
Implementation of sequence list (ArrayList)
1. What is a sequence list? The sequence table is a linear storage structure (linear table), which is composed of a storage unit with continuous physical addresses. Usually we use array storage to complete the addition, deletion, modification and query of data on the array. As shown below: 2. Simulate implementation of ArrayList Create the […]
The difference between ArrayList and LinkedList and their respective applicable scenarios
I believe everyone is familiar with ArrayList and LinkedList, they are two implementation classes of List. The bottom layer of ArrayList is implemented by an array, and the bottom layer of LinedList is implemented by a linked list. For ArrayList, it is said that it is a linked list. I prefer to call it a […]
Interpretation of ArrayList core source code
Inheritance relationship and implementation interface public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable { /* * List: Indicates that it is a list, supports operations such as addition, deletion, search, etc., and can be accessed through subscripts. * RandomAccess: This is a flag interface, indicating that the List collection that implements this interface […]
Containers (collections) in java, underlying principles of HashMap, differences between ArrayList, LinkedList, and Vector, reasons for hashMap loading factor 0.75
1. Containers in java Collections are mainly divided into two major interfaces: Collection and Map; the sub-interfaces of Collection include List and Set; the implementation classes of List collection include ArrayList, whose bottom layer is an array, and the bottom layer of LinkedList, which is a bidirectional acyclic list and Vector; the implementation classes of […]