学习知多少：java篇

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Dear you, this is The LearningYard Academy. Today Xiaobian brings you "Learn how much to know ：Java chapter”, welcome your visit.

一、思维导图

一、 Mind mapping

二、基本语法（下）

二、 Basic Grammar (Part 2)

Java 变量

Java variables

Java 中主要有如下几种类型的变量：

There are mainly several types of variables in Java：

局部变量

类变量（静态变量）

成员变量（非静态变量）

local variable

Class variable (static variable)

Member variable (non static variable)

Java注释

Java annotations

类似于 C/C++、Java 也支持单行以及多行注释。

Similar to C/C++, Java also supports single line and multi line annotations.

Java 空行

Java Blank Line

空白行或者有注释的行，Java 编译器都会忽略掉。

Blank or annotated lines will be ignored by the Java compiler.

继承

inherit

在 Java 中，一个类可以由其他类派生。如果你要创建一个类，而且已经存在一个类具有你所需要的属性或方法，那么你可以将新创建的类继承该类。

In Java, a class can be derived from other classes. If you want to create a class and there is already a class with the properties or methods you need, you can inherit the newly created class from that class.

利用继承的方法，可以重用已存在类的方法和属性，而不用重写这些代码。被继承的类称为超类（super class），派生类称为子类（sub class）。

By utilizing inherited methods, methods and properties of existing classes can be reused without rewriting these codes. The inherited class is called a superclass, and the derived class is called a subclass.

接口

Interface

在 Java 中，接口可理解为对象间相互通信的协议。接口在继承中扮演着很重要的角色。

In Java, interfaces can be understood as protocols for communicating between objects. Interfaces play a crucial role in inheritance.

接口只定义派生要用到的方法，但是方法的具体实现完全取决于派生类。

The interface only defines the methods used for derivation, but the specific implementation of the methods depends entirely on the derived class.

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翻译来源于谷歌翻译

部分来源于

百度文库

清华大学出版《java程序设计基础》

编辑&排版|百味

审核|闫庆红