国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home Java javaTutorial In object-oriented programming: Are attributes and states really equivalent?

In object-oriented programming: Are attributes and states really equivalent?

Apr 19, 2025 pm 04:18 PM
the difference

In object-oriented programming: Are attributes and states really equivalent?

Object-oriented programming: a detailed interpretation of properties and states

In object-oriented programming, properties and states are often confused, and the two are closely related but different. This article will deeply explore the role and differences between attributes and states in objects, and answer the core question of "whether attributes and states are equal."

In the article, Teacher object is used as an example and status attribute is used to represent its status (teaching, eating, sleeping). The value of status will change according to the call of methods such as teach , eat , sleep , etc., which seems to indicate that the status can be represented by attributes.

However, not all properties represent the state of the object. It depends on our understanding of "state". status attribute reflects the dynamic behavior of Teacher object and is a typical manifestation of state. But if other attributes are considered, such as the teacher's date of birth or the radius of the circle, these attribute values ??are usually unchanged throughout the life of the object. These static properties are not the state of the object, but the descriptive information of the object.

Therefore, attributes are means to describe the characteristics of an object, and states are the dynamic representation of an object at a specific moment. Attributes can be used to represent states, but not all attributes represent states. The attributes can be static descriptive or dynamic, and are used to reflect the state of the object. The key is whether the attribute value changes due to object behavior or time. If the property value changes, it is likely to represent the state of the object; otherwise, it may be just an inherent property of the object.

The above is the detailed content of In object-oriented programming: Are attributes and states really equivalent?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Ouyi Exchange App Official Download Ouyi Exchange Official Website Portal Ouyi Exchange App Official Download Ouyi Exchange Official Website Portal May 29, 2025 pm 06:30 PM

Official download guide for Ouyi Exchange app: Android users can download it through the Google Play Store, and iOS users can download it through the Apple App Store. Visit the official website www.ouyiex.com to register and log in. Both the application and the official website provide rich transaction and management functions.

sql database statements summary of common statements for sql database sql database statements summary of common statements for sql database May 28, 2025 pm 08:12 PM

Common SQL statements include: 1. CREATETABLE creates tables, such as CREATETABLEemployees(idINTPRIMARYKEY, nameVARCHAR(100), salaryDECIMAL(10,2)); 2. CREATEINDEX creates indexes, such as CREATEINDEXidx_nameONemployees(name); 3. INSERTINTO inserts data, such as INSERTINTO employeees(id, name, salary)VALUES(1,'JohnDoe',75000.00); 4. SELECT check

What does Quasimodo mean? How to use Quasimodo trading strategy to trade in 2025? What does Quasimodo mean? How to use Quasimodo trading strategy to trade in 2025? May 26, 2025 pm 07:36 PM

What does Quasimodo mean? How to use Quasimodo trading strategy? The Quasimodo trading strategy is a unique strategy to identify potential buy and sell areas. In 2025, the strategy has evolved significantly through new variants such as AI-driven pattern recognition, nesting and fractal Quasimodo (QM), as well as integration with the decentralized finance (DeFi) platform. Quasimodo strategy remains extremely profitable for cryptocurrency trading, now has enhanced risk management techniques and demonstrates impressive performance metrics such as the 72% win rate of the continuity model. Modern traders

What is the difference between == and === in PHP? What is the difference between == and === in PHP? May 23, 2025 pm 08:18 PM

In PHP, == and == are used to compare arrays, == makes loose comparisons, and === makes strict comparisons. 1.== When comparing, the key-value pairs of the array need to be the same, and the order is not important. 2.=== When comparing, the key-value pairs and order of the array must be exactly the same. The choice of which operator to use depends on the specific requirements and scenario.

Apple phone suddenly restarts cycle and solves unlimited restart failure operation steps Apple phone suddenly restarts cycle and solves unlimited restart failure operation steps May 29, 2025 pm 08:39 PM

The reasons why Apple phones suddenly enter the restart cycle include software failures, hardware problems and system updates. The solution is: 1. Force restart: quickly press the volume up key, then press the volume down key, and finally press the side button until the Apple logo appears. 2. Recovery mode: Connect to the computer, press and hold the side button to the recovery mode screen appear. 3.DFU mode: Connect the computer, press and hold the side button and the volume down key for 10 seconds at the same time, then release the side button and continue to hold the volume down key for 10 seconds. 4. Hardware failures require you to go to the official or authorized repair center of Apple. Preventive measures include keeping the system and application updated, avoiding installation of unknown applications, and backing up data regularly.

Leading cryptocurrency exchange Kucoin List Resolv (Resolv) protocol Leading cryptocurrency exchange Kucoin List Resolv (Resolv) protocol Jun 12, 2025 am 11:54 AM

This heralds the first time an innovative protocol behind a new Stablecoin backed by Ethereum (ETH) and Bitcoin (BTC) is being held. Kucoin, the world's leading cryptocurrency trading platform, announced the launch of Resolv (Resolv) trading pairs in its spot market. This cooperation marks an important node in the development of the Resolv protocol, aiming to build a stablecoin ecosystem that requires no trust and has efficient capital utilization. From 13:00 UTC on May 18, Kucoin users can trade Resolv tokens through USDT trading pairs. Before the transaction is officially opened, the platform will hold an hour of gathering competition between 12:00 and 13:00UTC.

How to extract table structure information from SQL file How to extract table structure information from SQL file Jun 04, 2025 pm 07:45 PM

Extracting table structure information from SQL files can be achieved through the following steps: 1. Use regular expressions or SQL parsing library to parse CREATETABLE statements; 2. Extract table names, column names, data types and constraints; 3. Consider syntax differences and complex constraints of different DBMSs; 4. Consider performance and error handling when handling large files. This method facilitates database design and maintenance.

Binance official web version login entrance binance web version link entrance Binance official web version login entrance binance web version link entrance Jun 09, 2025 pm 06:00 PM

To find the correct login portal for Binance web version, you must enter https://www.binance.com directly in your browser; do not click on unknown links; add the official website to bookmark; confirm that the search engine displays the binance.com domain name; if you encounter regional restrictions, you can contact customer service.

See all articles