Java基础知识汇总

偏执的太偏执、 2023-06-28 11:13 15阅读 0赞

**目录**

1 基础知识

2 区别不同

3 语法

3.1 数据类型

3.2 面向对象

3.2.1 继承 extends

3.2.2 super关键字

3.2.3 重写

3.2.4 多态

3.2.5 抽象类 abstract

3.2.6 final

3.2.7 接口 interface 与 implements

3.3 包的使用规则 package

3.3.1 jar的使用

3.4 异常处理

3.4.1 finally的作用：

3.4.2 自定义异常一个例子

3.5 小细节

3.5.1细节：类方法传参与类型检查

3.5.2 toString方法

3.5.3 String 与StringBuffer

3.5.4 equals方法

4 线程相关

4.1 什么是程序

4.2 进程

4.2.1 线程基本概念

4.2.2 线程控制的基本方法：

4.2.3 线程同步 Synchronized

4.2.4 notify和wait方法

5 用户界面GUI: 组件awi 或Swing

6 事件

7 匿名类使用场景

8 jar包生成

9 容器

9.1 容器API类图(Set List Map)

9.2 为什么需要容器

9.3 ArrayList与LinkedList区别

9.4 Hash Table 哈希表

9.5 为什么要重写hashcode方法？

--------------------

# 1 基础知识 #

**java****语言的历史：**

最初是为了控制家用电器设计的，

网络的兴起（不同机器不同软硬件环境，java可以跨平台）让java火起来

**java****两大核心机制：**

JVM：java虚拟机for windows/unix/linux，一次编译到处运行；也是一个软件

Garbage Collection: 垃圾自动回收

**JDK****：**java开发工具包，包含了JRE

包含工具：编译源代码的javac.exe 运行java程序的java.exe

**JRE****：** java运行环境,包含jvm和核心类库

**java语言特点：**

1）简单易学

摒弃了指针 结构 及内存管理：程序员只需要分配内存，不需要释放内存，jvm自动管理（在程序闲时自动释放）

类库丰富！！

完全面向对象！！

2）安全性高

强类型语言，类型检查必c/c++严格

垃圾自动回收

禁止非法内存访问

3）跨平台

作为一门网络语言：编译成结构中立的中间文件格式（与平台无关的字节码格式），在系统对应的jvm上运行

c/c++ 编译成 特定机器的机器语言（用户->高级语言程序->编译器->操作系统->硬件）

java: 编译成 与平台无关的字节码格式，由jvm来转换成 特定机器的机器语言

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 1][]

4）多线程

在语言上支持多线程的设计

**java应用领域：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 2][]

# 2 区别不同 #

1）源代码以".java"结束；.java文件名称一般应该与文件中定义的public class类名保持一致；

并且一个java文件只能有一个public class类（**启动类**）

2） 编译命令： javac HelloWorld.java 编译时，使用文件名，会生成文件中以类名命令的.class文件

运行命令： java HelloWorld //=>注意没有后缀！！执行的是 类名命令的.class文件

3） 编译好后是.class文件 (与平台无关的字节码格式，由jvm来转换成 特定机器的机器语言)

4） java中的函数，也叫做方法，使用自己class对象，**不需要定义形参**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 3][]

5） 不使用include ，使用import

6）环境变量：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 4][]

7）cd命令 windows切换目录：cd 目标目录 enter后， **还需要输入目标目录的盘符！**

![20200108233210867.png][]

cd .. 返回上级目录

cd \\ 返回根目录

8） /\*\* \*/ 用于将注释变成说明文档，用javadoc实现

9）java语言思想

面向对象：

是 一种哲学**思想**：

要解决问题，先创造**对象**，通过对象来模拟事务：

对象= 静态属性 + 动态行为

# 3 语法 #

## 3.1 数据类型 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 5][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 6][]

%x 输出以16进制形式表示、小写 “\#”表示输出数值前加0x

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 7][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 8][]

\\u0030 u表示unicode编码方式

**java中，类型所占用的字节数是确定不变的：**（c/c++ 字节数只规定不能小于xxx,与机器有关的）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 6][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 9][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 10][]

## 3.2 面向对象 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 11][]

![20200108233301229.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 12][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 13][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 14][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 15][]

类的属性，也叫 类的**数据成员**，**字段** 或 **域**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 16][]

1.  **protected**和 public可以通过类名访问，private不能通过类名访问
2.  静态方法只能访问静态成员、静态方法
3.  C语言中，我们对一个功能函数要实现不同类型的调用时，就必须得取不同的名称； c++/java可以重载（只要函数形参列表（个数or类型）不一样即可），函数返回值不同，不能作为重载的条件
4.  类中的属性，会被系统默认初始化；局部变量则不会被系统初始化。
5.  内存空间分配：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 17][]

同一个类的两个对象，放在栈空间，对象对应的属性值分别放在堆空间，类的方法放在代码区，只有一份！show方法通过this找到对应的对象的属性值，每个非static方法都还有一个this指针

1.  String 类型：字符串 **S大写**
2.  **static：** 定义类的静态属性或者方法，静态成员可以通过类名访问，也可以通过类的实例对象访问
    
    1.  若希望一个类没有实例对象，将其构造函数定义成private的即可
    2.  构造函数不能定义成static的即可
    3.  如何定义一个只能实例化一个对象的类（aa类似于链表中的指针，可以指向本身）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 18][]

### 3.2.1 继承 extends ###

关键字 extends： 只支持单继承，**不支持多继承**(c\#同样不允许，c++却允许)

理解： B是一个A吗？若是 则B可以继承A；

反映的是一般到特殊的关系，如（人->男人->男学生）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 19][]

父类的私有成员不能被继承（物理上已经有继承，只是不能访问），所以继承要慎重，否则浪费内存空间

子类对象，可以调用父类的protected方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 20][]

### 3.2.2 super关键字 ###

1.  只能在子类中的**构造方法**中使用，用于初始化继承自父类的属性；
2.  前提是，父类中**已经定义了相应签名的构造方法**！
3.  同时，若是子类在**构造方法**中不调用super方法，则默认使用“super()；”调用父类的“A()”构造函数；此时，应确保父类A中，**有**显式定义了的构造函数“A()\{…\}”!
4.  调用的super方法，应位于子类构造方法的**最前面**的语句，且只能调用**一次**super方法
5.  super**代替父类的类名，**在子类中调用父类的public或protected方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 21][]

子类的普通方法不能调用super方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 22][]

### 3.2.3 重写 ###

目的：对父类的方法不满意，想要更新或者拓展父类的方法：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 23][]

注意：子类继承的方法的权限，不应比继承自父类的方法更严格（为了保证多态都能实现）下面的两个关键字应互换，否则会出错。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 24][]

注意：返回值不能作为**重载**的条件，如下，会报错：因为子类中有了两个同名同参但不同返回值的方法！

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 25][]

### 3.2.4 多态 ###

父类=子类：因为子类可以当做父类看，所以可以把子类赋值给父类

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 26][]

### 3.2.5 抽象类 abstract ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 27][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 28][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 29][]

**可以定义一个抽象类的引用**，A a; // ok

不可以定义一个抽象类的对象 A a = new A(); // error

### 3.2.6 final ###

![20200108233303149.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 30][]

被final修饰的变量是**常变量**，类似 c++中的const修饰符

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 31][]

### 3.2.7 接口 interface 与 implements ###

比抽象类要求更严格的抽象类，因此不能new出对象来

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 32][]

属性系统会默认赋值；局部变量定义后，不初始化是一个垃圾值（java语法不允许（使用未初始化的局部变量），c语法不检查）

接口的多态使用：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 33][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 34][]

## 3.3 包的使用规则 package ##

classpath:编译器去查找的当前使用的class类所在的路径；若当前使用的class类不在当前执行时的路径下，则应该通过cmd中设置“**set classpath=你的用到class类的顶层路径;**”来让编译器找到当前使用的类。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 35][]

jar包之间的访问：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 36][]

### 3.3.1 jar的使用 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 37][]

执行打包命令

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 38][]

如何使用jar包中的类

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 39][]

## 3.4 异常处理 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 40][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 41][]

**throws**: 将本函数发生的异常交给调用者处理，自己不作处理，及向外抛出

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 42][]

### 3.4.1 finally的作用： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 43][]

### 3.4.2 自定义异常一个例子 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 44][]

## 3.5 小细节 ##

### 3.5.1细节：类方法传参与类型检查 ###

a) 类里面 方法可以直接使用属性变量，而不用传参。

b) 严格类型：double跟int 不会隐式转换，会报错！又如if(3)，会报错，数字就是数字，boolean就是布尔，不能混用。

### 3.5.2 toString方法 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 45][]

**printf 对比 printfln:**

printf: 输出多个对象时，使用比较方便; 输出指定格式的数据时比较方便。

printfln: 输出自定义对象时比较方便（调用toString方法）

### 3.5.3 String 与StringBuffer ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 46][]

### 3.5.4 equals方法 ###

同一个类的两个对象，即使两者的属性值都相等，这个两个对象也不相等，即a1.equals(a2) 返回的是false.

同一个list容器，可以放不同类型的数据（数组则只能放同类型的对象）

但是在set容器中（不允许元素重复），对于具有相同属性值得同一个类的两个对象，不会重复添加！

重写equals方法，让同一个类的相同属性的两个对象，返回相等的判断结果。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 47][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 48][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 49][]

一个例子：new出来的string存在堆区，直接比“==”，比的是地址，不相等；赋值定义string, 存放在静态数据区（字符常量区），比“==” 比的是字符串常量，所以相等。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 49][]

# 4 线程相关 #

## 4.1 什么是程序 ##

所谓的程序，是一个严格有序的指令的集合，程序规定了完成某一任务时，计算机所需要做的各种操作，以及这些操作的执行顺序。

## 4.2 进程 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 50][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 51][]

进程3部分组成：程序段 数据段 PCB(进程控制块)

### 4.2.1 线程**基本概念** ###

class Mythread extends Thread \{ \}

class Mythread implements Runable \{ \}

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 52][]

![20200108234638571.png][]

![20200108234631596.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 53][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 54][]

### 4.2.2 线程控制的基本方法： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 55][]

线程优先级：1~10， 主线程默认是5，子线程与父线程默认优先级相同。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 56][]

### **4.2.3 线程同步 Synchronized** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 57][]

推荐使用继承接口Runnable的方法，构造需要执行的多线程类。

原因如下：使用同一个类对象可以构造多个线程对象，这样，访问的是同一个类对象，便于使用同步机制。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 58][]

### **4.2.4 notify和wait方法** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 59][]

# 5 用户界面GUI: 组件awi 或Swing #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 60][]

网页界面： html + css

# 6 事件 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 61][]

# 7 匿名类使用场景 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 62][]

# 8 jar包生成 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 63][]

# 9 容器 #

## 9.1 容器API类图(Set List Map) ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 64][]

## 9.2 为什么需要容器 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 65][]

## 9.3 ArrayList与LinkedList区别 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 66][]

## 9.4 Hash Table 哈希表 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 67][]

## 9.5 为什么要重写hashcode方法？ ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 68][]

例子：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoeWpoeXAxMQ_size_16_color_FFFFFF_t_70 69][]

(onging) hereto: 100集 13min

**参考：** 郝斌 java视频教程

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