java笔记汇总

前言

 特点

运行原理

 目录

一基础知识

配置环境

 中基本概念

二定义，关键字和类型

变量和作用域

操作符

数字类型之间的转换

强制类型转换

转换的二种类型

控制流

循环语句

四数组

声明数组

创建数组

成员变量和局部变量

成员方法

 关键字

访问控制符

构造方法

数据和方法的隐藏―――封装

方法的重载

六高级语言特性

封装  !"#

继承 $!#

方法的覆盖（"$$**+）

多态的分类

运行时多态的三原则

关系运算符：!",

静态变量，方法和类

%+ !" 模式

, 关键字

, 变量不能被改变-

封装类

内部类

内部类的分类

成员内部类

局部内部类

静态内部类

匿名内部类

集合

集合接口类层次

集合类层次

处理异常

捕捉多个异常

, (声明

异常调用栈

异常层次

一些未检查的异常

写你自己的异常

抛出你自己的异常

八图形用户接口

九0（'!$!0*"1"" 2!） 事件模型

线程原理

线程实现的两种形式

线程的生命周期

$* 的方法

共享数据的并发处理

使用互斥锁的注意事项

十四标准 56. 流与文件

对文件的操作

网络基础知识

建立 &7 服务器端

建立 &7 客户端

建立 897 连接

897"2!

建立 897发送端

建立 897接受端

/ 的新特性

:泛型

泛型的一些局限型

增强的 ,"$ 循环

:自动装箱和自动拆箱

在基本数据类型和封装类之间的自动转换

类型安全的枚举

:静态引入

& 风格的格式化输出

= *+%!$+%!$+= *$ 类#

可变长的参数

的注释 "!!"#

1. 前言

1.1. JAVA 特点

#简单 语法是 &>>语法的一个“纯净”版本#；

#可移植性一次编译到处运行#

#面向对象

#分布式 把打开套接字连接等繁琐的网络任务变得非常容易#

#健壮性 编译器会检查出很多其他语言在运行时刻才显示出来的错误；

 采用的指针模型可以消除重写内存和数据崩溃的可能#

#多线程多线程编程的简单性是  成为流行的服务器端开发语言的主要原因

1.2. 运行原理

先编译?/ 文件――――@?  文件

运行 ? ――加载――@A（ 虚拟机）

1.3. JAVA 目录

BC―――――――运行环境

%B&――――――－类库

=5D―――――――应用程序

2. 一·基础知识

2.1. 配置环境

35D8E 系统（修改环境配置文件）

 打开 

我的电脑属性―――@环境变量

设置环境变量：

FG.ACH路径

7GHL7GL-JM/*2FM'-

&3%%7GH-

#源文件

在最顶层只包括一个 '  类型的类6接口，文件名与类6接口名同并以/

作为文件后缀。

#包2+N在源文件中 !*!,( 只能放在第一行，且最多只能是一行#

一个将类和接口组织在一块的实体，在文件系统中以目录6文件夹型式呈现。