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1
目录
1 人机交互 .......................................................................................................................................4
2 下载和安装 JDK.............................................................................................................................6
3 Notepad 下载和安装 ....................................................................................................................7
4 Java 三大平台................................................................................................................................8
5 Java 基础语法..............................................................................................................................11
5.1 注释 .................................................................................................................................11
5.2 关键字 .............................................................................................................................12
5.3 字面量 .............................................................................................................................12
5.4 变量 .................................................................................................................................14
5.5 计算机存储规则..............................................................................................................15
5.6 数据类型 .........................................................................................................................16
5.7 标识符 .............................................................................................................................17
5.8 键盘录入 .........................................................................................................................18
5.9 IDEA 的下载安装..............................................................................................................18
5.10 运算符 ...........................................................................................................................20
5.11 流程控制语句 ...............................................................................................................24
5.12 数组 ...............................................................................................................................28
5.13 方法、方法重载、方法内存........................................................................................31
6 面向对象 ....................................................................................................................................33
6.1 类和对象 .........................................................................................................................33
6.2 封装 .................................................................................................................................35
6.3 标准的 JavaBean 类 ........................................................................................................38
6.4 API 和字符串(String、StringBuilder、Stringjoiner) ...................................................39
6.5 集合 .................................................................................................................................45
7 面向对象进阶 ............................................................................................................................47
7.1 static 静态变量.................................................................................................................47
7.2 继承 .................................................................................................................................48
7.3 多态 .................................................................................................................................53
7.4 包和 final .........................................................................................................................54
7.5 权限修饰符 .....................................................................................................................56
7.6 抽象类和抽象方法..........................................................................................................57
7.7 接口 .................................................................................................................................58
7.8 内部类 .............................................................................................................................62
7.9 常用 API ............................................................................................................................67
7.9.1 Math.......................................................................................................................67
7.9.2 System....................................................................................................................68
7.9.3 Runtime..................................................................................................................69
7.9.4 Object.....................................................................................................................70
7.9.5 BigInteger 和 BigDecimal .......................................................................................72
7.9.6 正则表达式 ..........................................................................................................75
7.9.7 爬虫 ......................................................................................................................77
7.9.8 JDK7 时间-Date、SimpleDateFormat、Calendar .................................................82
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7.9.9 JDK8 时间类-时区、时间和格式化、日历和工具类 ..........................................86
7.9.10 包装类 ................................................................................................................89
7.9.11 Arrays ...................................................................................................................92
7.10 lambda 表达式 .......................................................................................................92
8 集合进阶 ....................................................................................................................................94
8.1.1 单列集合顶层接口 Collection..............................................................................94
8.1.2 Collection 的遍历方式-迭代器、增强 for、lambda 表达式 ...............................96
8.2.1 List 集合和五种遍历方式 .....................................................................................98
8.2.2 List 的实现类-ArrayList、LinkedList(Vector 被淘汰了) ..................................99
8.3 泛型类、泛型方法、泛型接口、泛型的通配符 ................................................100
8.4.1 Set 集合 ...............................................................................................................104
8.4.2 Set 的实现类-HashSet、LinkedHashSet、TreeSet .............................................105
8.5 Map 双列集合 ........................................................................................................109
8.5.1 Map 集合常用的 API...........................................................................................110
8.5.2 Map 集合的三种遍历方式 .................................................................................110
8.5.3 HashMap、LinkedHashMap、TreeMap..............................................................112
8.6.1 可变参数 ............................................................................................................114
8.6.1 集合工具类 Collections.......................................................................................115
8.7 不可变集合 ...........................................................................................................115
9 Stream 流...................................................................................................................................116
9.1 Stream 流的思想和获取 Stream 流.......................................................................116
9.2 Stream 流的中间方法 ............................................................................................118
9.3 Stream 流终结方法 ................................................................................................118
9.4 收集方法 collect....................................................................................................119
10 方法引用 ................................................................................................................................119
10.1 方法引用概述......................................................................................................119
10.2 引用静态方法......................................................................................................121
10.3 引用其他类的成员方法......................................................................................121
10.4 引用本类或父类的成员方法..............................................................................121
10.5 引用构造方法......................................................................................................121
10.6 类名引用成员方法..............................................................................................122
10.7 引用数组的构造方法..........................................................................................122
11 异常 ........................................................................................................................................123
11.1 异常体系介绍......................................................................................................123
11.2 编译时异常和运行时异常..................................................................................125
11.3 异常在代码中的两个作用..................................................................................126
11.4 JVM 虚拟机默认处理异常的方式.......................................................................126
11.6 异常中的常见方法..............................................................................................129
11.7 抛出异常 .............................................................................................................129
11.8 自定义异常 .........................................................................................................130
12 File 类.......................................................................................................................................131
12.1 File 的概述和构造方法 ........................................................................................131
12.2 File 的成员方法(判断、获取) ........................................................................132
12.3 File 的成员方法(创建、删除) ........................................................................133
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12.4 File 的成员方法(获取并遍历) ........................................................................134
12.5 File 的成员方法(所有获取并遍历的方法) ....................................................134
13 IO 流.........................................................................................................................................135
13.1 IO 流的概述..........................................................................................................135
13.2 IO 流的体系和字节输入输出流基本用法 ..........................................................136
13.3 字节输出流写出数据的细节..............................................................................137
13.4 字节输出流写出数据的三种方式......................................................................138
13.5 换行和续写 .........................................................................................................138
13.6 字节输入流的基本用法......................................................................................139
13.7 字节输入流读取数据的细节..............................................................................140
13.8 字节输入流循环读取..........................................................................................140
13.9 文件拷贝的基本代码..........................................................................................140
13.10 文件拷贝的弊端和解决方案.............................................................................141
13.11 文件拷贝改写....................................................................................................141
13.12 IO 流中不同 JDK 版本捕获异常的方式.............................................................141
13.13 字符集详解(ASCII、GBK、Unicode) ...........................................................142
13.14 乱码存在原因....................................................................................................143
13.15 Java 中编码和解码的代码实现 .........................................................................144
13.16 字符输入流-空参 read 方法详解、有参 read 方法详解 ................................145
13.17 字符输出流写出数据........................................................................................147
13.18 字节缓冲流拷贝文件(一次读写一个字节) ................................................148
13.19 字节缓冲流拷贝文件(一次读写一个字节数组) .........................................150
13.20 字符缓冲流 .......................................................................................................150
13.21 转换流基本用法................................................................................................151
13.22 序列化流 ...........................................................................................................153
13.21 反序列化流 .......................................................................................................154
13.22 序列化流和反序列化流的使用细节................................................................154
13.23 字节打印流 .......................................................................................................155
13.24 字符打印流 .......................................................................................................156
13.25 解压缩流 ...........................................................................................................157
13.26 压缩流-压缩单个文件 ......................................................................................157
13.27 压缩流-压缩文件夹 ..........................................................................................158
13.28 常用工具包(Commons-io) ...........................................................................158
13.29 常用工具包(hutool) .....................................................................................159
14 多线程&JUC............................................................................................................................160
14.1 什么是多线程、并发和并行..............................................................................160
14.2 多线程的三种实现方式......................................................................................161
14.3 多线程中的常用成员方法..................................................................................162
14.4 线程的优先级......................................................................................................163
14.5 守护线程、礼让线程、插入线程......................................................................163
14.6 线程的生命周期..................................................................................................164
14.7 线程的安全问题..................................................................................................164
14.8 同步代码块 .........................................................................................................164
14.9 同步方法 .............................................................................................................166
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14.10 lock 锁.................................................................................................................166
14.11 死锁 ...................................................................................................................167
14.12 等待唤醒机制(消费者、生产者代码实现) ................................................167
14.13 阻塞队列实现等待唤醒机制............................................................................167
14.14 线程的 6 种状态................................................................................................168
14.15 线程池 ................................................................................................................169
14.16 自定义线程池....................................................................................................171
14.17 最大并行数、线程池多大合适........................................................................172
15 网络编程 ................................................................................................................................173
15.1 初始网络编程......................................................................................................173
15.2 网络编程三要素..................................................................................................174
15.3 三要素(IP) ......................................................................................................175
15.4 ipv4 的一些小细节...............................................................................................175
15.5 InetAddress 类的使用 ..........................................................................................175
15.6 端口号和协议......................................................................................................176
15.7 UDP 协议(发送和接收数据)...........................................................................176
15.8 单播、组播、广播..............................................................................................178
15.9 TCP 协议(发送和接收数据)............................................................................178
15.10 TCP 协议(中文乱码问题)..............................................................................179
15.11 三次握手和四次挥手........................................................................................179
16 反射 ........................................................................................................................................180
16.1 概述 .....................................................................................................................180
16.2 获取 class 对象的三种方式 ................................................................................181
16.3 反射获取构造方法..............................................................................................182
16.4 反射获取成员变量..............................................................................................183
16.5 反射获取成员方法..............................................................................................183
17 动态代理 ................................................................................................................................184
1 人机交互
①图形化界面
②cmd 使用命令行
打开 cmd
5
常见的 cmd 命令
配置环境变量的作用
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