How to define a class in java
How to define a class in java
Member variables: attributes corresponding to things
Member methods : Corresponding to the behavior of things
Format of class definition
public class ClassName{ // 成员变量 // 成员方法 }
Define a class: It is to define the members of the class, including member variables and member methods (Recommended tutorial: java tutorial )
Member variables: It is almost the same as defining variables before. Only the location has changed. In the class, outside the method.
Member method: It is almost the same as the previously defined method. Just remove static, the role of static is in object-oriented
Example of class definition format
public class Person { //定义成员变量 private String name;//姓名 private int age;//年龄 private char gendar;//性别 //定义成员方法 /** * study方法 * */ public void study(){ System.out.println("好好学学习,天天向上"); } /** * sleep();睡觉 */ public void sleep(){ System.out.println("学习一天了,可以睡觉了"); } }
Class in Java
Classes can be seen as templates for creating Java objects. It is a collection of entities with certain common characteristics. It is an abstract data type. It is an abstraction of entities with the same characteristics. In object-oriented programming languages, a class is an abstraction of the properties and behavior of a type of "thing".
Give an example to illustrate the following category. For example, Person (person) is a category, then a specific person "Zhang San" is the object of the "human" category, and "name, height, weight" and other information They are the attributes of the object, and human actions such as "eating, getting dressed," etc. are the methods of the object. In short, a class is a collection of things with the same characteristics, and an object is a specific instance of the class. At the same time, classes have polymorphism and inheritance. For example, "human beings" can be divided into "men, women", "elderly people, children", then "men, women" are subclasses of "human beings" and so on.
The above is the detailed content of How to define a class in java. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



Guide to Perfect Number in Java. Here we discuss the Definition, How to check Perfect number in Java?, examples with code implementation.

Guide to Weka in Java. Here we discuss the Introduction, how to use weka java, the type of platform, and advantages with examples.

Guide to Smith Number in Java. Here we discuss the Definition, How to check smith number in Java? example with code implementation.

In this article, we have kept the most asked Java Spring Interview Questions with their detailed answers. So that you can crack the interview.

Java 8 introduces the Stream API, providing a powerful and expressive way to process data collections. However, a common question when using Stream is: How to break or return from a forEach operation? Traditional loops allow for early interruption or return, but Stream's forEach method does not directly support this method. This article will explain the reasons and explore alternative methods for implementing premature termination in Stream processing systems. Further reading: Java Stream API improvements Understand Stream forEach The forEach method is a terminal operation that performs one operation on each element in the Stream. Its design intention is

Guide to TimeStamp to Date in Java. Here we also discuss the introduction and how to convert timestamp to date in java along with examples.

Capsules are three-dimensional geometric figures, composed of a cylinder and a hemisphere at both ends. The volume of the capsule can be calculated by adding the volume of the cylinder and the volume of the hemisphere at both ends. This tutorial will discuss how to calculate the volume of a given capsule in Java using different methods. Capsule volume formula The formula for capsule volume is as follows: Capsule volume = Cylindrical volume Volume Two hemisphere volume in, r: The radius of the hemisphere. h: The height of the cylinder (excluding the hemisphere). Example 1 enter Radius = 5 units Height = 10 units Output Volume = 1570.8 cubic units explain Calculate volume using formula: Volume = π × r2 × h (4

Java is a popular programming language that can be learned by both beginners and experienced developers. This tutorial starts with basic concepts and progresses through advanced topics. After installing the Java Development Kit, you can practice programming by creating a simple "Hello, World!" program. After you understand the code, use the command prompt to compile and run the program, and "Hello, World!" will be output on the console. Learning Java starts your programming journey, and as your mastery deepens, you can create more complex applications.
