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Object-Oriented Programming Concepts
面向对象编程概念

What Is an Object? 什么是对象？
What Is a Class? 什么是类？
What Is Inheritance? 什么是继承？
What Is an Interface? 什么是接口？
What Is a Package? 什么是包？
Questions and Exercises: Object-Oriented Programming Concepts 面向对象概念问题和练习题

Language Basics
语言基础

Variables 变量 Primitive Data Types 原始数据类型 Arrays 数组 Summary of Variables 变量概要 Questions and Exercises: Variables 变量问题与练习题
Operators 操作符 Assignment, Arithmetic, and Unary Operators 赋值运算符, 算术运算符, 和一元运算符 Equality, Relational, and Conditional Operators 复合运算符, 关系运算符, 和条件运算符 Bitwise and Bit Shift Operators 位运算和位移运算 Summary of Operators 运算符概要 Questions and Exercises: Operators 操作符问题和练习题
Expressions, Statements, and Blocks 表达式, 语句, 和程序块
Questions and Exercises: Expressions, Statements, and Blocks 表达式、语句、程序块问题和练习题
Control Flow Statements 流程控制语句 The if-then and if-then-else Statements if-then和if-then-else语言 The switch Statement switch 开关语句 The while and do-while Statements while和do-while循环语句 The for Statement for循环语句 Branching Statements 分支语句 Summary of Control Flow Statements 流程控制语句概要 Questions and Exercises: Control Flow Statements 流程控制语句问题和练习题

Classes and Objects
类和对象

Classes 类 Declaring Classes 声明类 Declaring Member Variables 声明成员变量 Defining Methods 定义方法 Providing Constructors for Your Classes 为您的类提供构造方法 Passing Information to a Method or a Constructor 类方法或构造函数的信息传递
Objects 对象 Creating Objects 创建对象 Using Objects 使用对象
More on Classes 关于类更多 Returning a Value from a Method 从方法中返回值 Using the this Keyword 使用this关键词 Controlling Access to Members of a Class 控制类成员的数据存取 Understanding Instance and Class Members 理解实例化和类成员 Initializing Fields 初始化字段 Summary of Creating and Using Classes and Objects 创建使用类和对象概要 Questions and Exercises: Classes 类问题和练习题 Questions and Exercises: Objects 对象问题和练习题
Nested Classes 嵌套类 Inner Class Example 内部类举例 Summary of Nested Classes 嵌套类概要 Questions and Exercises: Nested Classes 嵌套类的问题和练习题
Enum Types 枚举类型
Questions and Exercises: Enum Types 枚举类型的问题和练习题
Annotations 注释
Questions and Exercises: Annotations 注释问题和练习题

Interfaces and Inheritance
接口和继承

Interfaces 接口 Defining an Interface 定义一个接口 Implementing an Interface 执行一个接口 Using an Interface as a Type 把接口作为一个类型使用 Rewriting Interfaces 重写接口 Summary of Interfaces 接口概要 Questions and Exercises: Interfaces 接口问题和练习题
Inheritance 继承 Overriding and Hiding Methods 覆写和隐藏方法 Hiding Fields 隐藏字段 Using the Keyword super 使用super关键词 Object as a Superclass 对象作为超类 Writing Final Classes and Methods 最终类和方法 Abstract Methods and Classes 抽象方法和类 Summary of Inheritance 继承概要 Questions and Exercises: Inheritance 继承问题和练习题

Numbers and Strings
数组和字符串

Numbers 数组 The Numbers Classes 数组类 Formatting Numeric Print Output 格式化数组打印输入 Beyond Basic Arithmetic 重载算术运算符 Summary of Numbers 数组概要 Questions and Exercises: Numbers 数组问题和练习题
Characters 字符
Strings 字符串 Converting Between Numbers and Strings 数组和字符串相互转换 Manipulating Characters in a String 在一个字符串中操纵字符 Comparing Strings and Portions of Strings 字符串比较和字符串分解 The StringBuilder Class 字符串构造类 Summary of Characters and Strings 字符和字符串概要 Questions and Exercises: Characters and Strings 字符和字符串的问题和练习题

Generics
通用型

Introduction 介绍
Generic Types 通用类型
Generic Methods and Constructors 通用方法和构造函数
Bounded Type Parameters
Subtyping
Wildcards
Type Erasure
Summary of Generics
Questions and Exercises: Generics

Packages
包

Creating and Using Packages 创建和使用包 Creating a Package 创建包 Naming a Package 命名包 Using Package Members 使用包成员 Managing Source and Class Files 管理源程序和类文件 Summary of Creating and Using Packages 创建和使用包概要 Questions and Exercises: Creating and Using Packages 创建和使用包的问题和练习题

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Trail: Learning the Java Language JAVA语言教程

This trail covers the fundamentals of programming in the Java programming language.

这个教程涵盖了JAVA程序语言的编程基础。

Object-Oriented Programming Concepts teaches you the core concepts behind object-oriented programming: objects, messages, classes, and inheritance. This lesson ends by showing you how these concepts translate into code. Feel free to skip this lesson if you are already familiar with object-oriented programming.

面向对象编程概念教给你面向对象编程背后的核心概念：对象，消息，类和继承。这一讲之后将向你展示如何使用这些概念转化为代码。如果你已经对面向对象编程很熟悉可以跳过此讲。

Language Basics describes the traditional features of the language, including variables, arrays, data types, operators, and control flow.

语言基础描述语言的基础特征，包括变量，数组，和数据类型，操作符和控制流程。

Classes and Objects describes how to write the classes from which objects are created, and how to create and use the objects.

类和对象描述如何从已经创建的对象中写出类，和如何创建和使用对象。

Interfaces and Inheritance describes interfaces—what they are, why you would want to write one, and how to write one. This section also describes the way in which you can derive one class from another. That is, how a subclass can inherit fields and methods from a superclass. You will learn that all classes are derived from the Object class, and how to modify the methods that a subclass inherits from superclasses.

接口和继承描述接口是什么，为什么你要去写它以及如何写它。这一章节同时描述你如何从一个类生成另一个类的方式。这就是，一个子类从超类中继承属性和方法。你将学到从对象中提取的所有类，并且学会如何修改一个从超类中继承的子类的方法。

Numbers and Strings This lesson describes how to use Number and String objects The lesson also shows you how to format data for output.

数组和字符串 这一讲将描述如何使用数组和字符串，这一讲同时向你展示如何格式化数据输出。

Generics are a powerful feature of the Java programming language. They improve the type safety of your code, making more of your bugs detectable at compile time.

通用型是JAVA编程语言的强大特性。它提升了你代码中的数据类型的安全性，同时能在你编译的时候检测出更多的bug。

Packages are a feature of the Java programming language that help you to organize and structure your classes and their relationships to one another.

包是JAVA编程语言的一个特征，它将帮你组织和构架你的类及它们之间的关系。

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