Inventory of Java language knowledge (final review) II

🌹Author: Yun Xiaoyi📝Personal homepage: Yun Xiaoyi’s homepage 📝Github: Yun Xiaoyi’s Github 🤟motto: Dare to face yourself silently by yourself，Strengthening yourself is the core. Don’t wait until you have nothing，before you make up your mind to do it. Plant a tree ， the best time is ten years ago， the second is now ！ learn to reconcile with yourself ， reconcile with the past ， ==I hope before spring comes，Let’s face the sea together，Spring is warm and flowers are blooming！==🤟=🤟= x1f44f;Column：C++👏 Order 👏👏 column ： data structure 👏 Article directory Preface ​ 1. Classes and objects ： a. What is the class ？ What is the object ？ b. Class ： The format of （1）class ： How to write （2）class？ General nouns are defined as member variables （attributes）： General verbs are defined as methods （behavior） Example of concretely defined classes c.Object： Create an object How to use the object 2. Constructor ： Function ： Detailed format &#xff1a ; Classification of constructors ： Constructors without parameters Constructors with parameters How to call the constructor ？ Note ： Example ： 3. Interface ： a. What is the interface ？ b .Format ： c. Basic use of interface ： d. Relationship between interface and…