Java entry study notes (1)-super basic

Java-Object Oriented Programming

1. Basic concepts

【Object】:

• Can refer to specific things, such as Shiba Inu, Husky
• Is a concrete instance of the class

【class】:

• Templates for instantiating objects, such as dogs

• Abstract concept and induction of objects

  -Features: static performance, such as coat color, name

  -Behavior: dynamic, such as running, jumping, eating

2. Object-oriented programming: Use programming methods to reflect real-life classes and objects

Define the class in the program from the existing real class (Class)

Create (instantiate) a concrete object (Object) from a class

[Syntax for creating classes in Java]

public class 类名{
    
    

    //类的内容

}

[Class naming convention]:

• Have a straightforward meaning
• Capitalize the first letter (capitalize the first letter of each word, that is, the camel-case principle);
• Don’t start with numbers, don’t include special characters

[Create an instance object of the class]

类名 对象名 = new 类名();
Dog dog1 = new Dog();

new: the most important sign for creating an instance object

Object naming rules: the same as the naming rules of class names, but the first letter is lowercase (the first letter of each word after it is uppercase)