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‎README.md

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### [Java 高级](docs/advanced)
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- [Java 正则](docs/advanced/java-regex.md)
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- [Java 正则从入门到精通](docs/advanced/java-regex.md) - 关键词：`Pattern`、`Matcher`、`捕获与非捕获`、`反向引用`、`零宽断言`、`贪婪与懒惰`、`元字符`、`DFA`、`NFA`
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- [Java 编码和加密](docs/advanced/java-crypto.md) - 关键词：`Base64`、`消息摘要`、`数字签名`、`对称加密`、`非对称加密`、`MD5`、`SHA`、`HMAC`、`AES`、`DES`、`DESede`、`RSA`
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- [Java 本地化](docs/advanced/java-locale.md)
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- [Java JDK8](docs/advanced/jdk8.md) - 关键词：`Stream`、`lambda`、`Optional`、`@FunctionalInterface`
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![img](http://dunwu.test.upcdn.net/snap/20200630205329.png)
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- [Java BIO](docs/io/java-bio.md) - 关键词：`InputStream`、`OutputStream`、`Reader`、`Writer`、`阻塞`
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- [Java IO 模型](docs/io/java-io.md) - 关键词：`InputStream`、`OutputStream`、`Reader`、`Writer`、`阻塞`
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- [Java NIO](docs/io/java-nio.md) - 关键词：`Channel`、`Buffer`、`Selector`、`非阻塞`、`多路复用`
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- [Java 序列化](docs/io/java-serialization.md) - 关键词：`Serializable`、`serialVersionUID`、`transient`、`Externalizable`、`writeObject`、`readObject`
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- [Java 网络编程](docs/io/java-net.md) - 关键词：`Socket`、`ServerSocket`、`DatagramPacket`、`DatagramSocket`

‎codes/javacore-basics/src/main/java/io/github/dunwu/javacore/string/StringAppendDemo01.java

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package io.github.dunwu.javacore.string;
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/**
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* 字符串常量拼接
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* <p>
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* 请比对本 java 文件和由它编译出的 class 文件
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*
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* @author peng.zhang
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* @date 2020/12/1
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*/
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public class StringAppendDemo01 {
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public static void main(String[] args) {
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// 本行代码在 class 文件中，会被编译器直接优化为：
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// String str = "abc";
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String str = "a" + "b" + "c";
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System.out.println("str = " + str);
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}
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}

‎docs/README.md

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### [Java 高级](advanced)
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- [Java 正则](advanced/java-regex.md)
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- [Java 编码和加密](advanced/java-crypto.md)
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- [Java 正则从入门到精通](advanced/java-regex.md) - 关键词：`Pattern`、`Matcher`、`捕获与非捕获`、`反向引用`、`零宽断言`、`贪婪与懒惰`、`元字符`、`DFA`、`NFA`
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- [Java 编码和加密](advanced/java-crypto.md) - 关键词：`Base64`、`消息摘要`、`数字签名`、`对称加密`、`非对称加密`、`MD5`、`SHA`、`HMAC`、`AES`、`DES`、`DESede`、`RSA`
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- [Java 本地化](advanced/java-locale.md)
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- [JavaJDK8](advanced/jdk8.md) - 关键词：`Stream`、`lambda`、`Optional`、`@FunctionalInterface`
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- [Java JDK8](advanced/jdk8.md) - 关键词：`Stream`、`lambda`、`Optional`、`@FunctionalInterface`
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### [Java 容器](container)
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![img](http://dunwu.test.upcdn.net/snap/20200630195043.png)
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- [Java BIO](io/java-bio.md) - 关键词：`InputStream`、`OutputStream`、`Reader`、`Writer`
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- [Java IO 模型](io/java-io.md) - 关键词：`InputStream`、`OutputStream`、`Reader`、`Writer`
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- [Java NIO](io/java-nio.md) - 关键词：`Channel`、`Buffer`、`Selector`、`多路复用`
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- [Java 序列化](io/java-serialization.md) - 关键词：`Serializable`、`Externalizable`、`ObjectInputStream`、`ObjectOutputStream`、`transient`
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- [Java 网络编程](io/java-net.md) - 关键词：`Socket`、`ServerSocket`、`DatagramPacket`、`DatagramSocket`

‎docs/advanced/README.md

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## 📖 内容
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- [Java 正则](java-regex.md)
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- [Java 编码和加密](java-crypto.md)
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- [Java 正则从入门到精通](java-regex.md) - 关键词：`Pattern`、`Matcher`、`捕获与非捕获`、`反向引用`、`零宽断言`、`贪婪与懒惰`、`元字符`、`DFA`、`NFA`
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- [Java 编码和加密](java-crypto.md) - 关键词：`Base64`、`消息摘要`、`数字签名`、`对称加密`、`非对称加密`、`MD5`、`SHA`、`HMAC`、`AES`、`DES`、`DESede`、`RSA`
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- [Java 本地化](java-locale.md)
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- [JavaJDK8](jdk8.md)
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- [Java JDK8](jdk8.md) - 关键词：`Stream`、`lambda`、`Optional`、`@FunctionalInterface`
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## 📚 资料
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- **书籍**
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- Java 四大名著
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- [《Java 编程思想（Thinking in java）》](https://item.jd.com/10058164.html)
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- [《Java 核心技术 卷 I 基础知识》](https://item.jd.com/12759308.html)
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- [《Java 核心技术 卷 II 高级特性》](https://item.jd.com/12791368.html)
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- [《Effective Java》](https://item.jd.com/12507084.html)
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- Java 入门
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- [《O'Reilly：Head First Java》](https://item.jd.com/10100190.html)
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- [《Java 从入门到精通》](https://item.jd.com/12555860.html)
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- [《疯狂 Java 讲义》](https://item.jd.com/12518025.html)
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- **教程、社区**
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- [Runoob Java 教程](https://www.runoob.com/java/java-tutorial.html)
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- [java-design-patterns](https://github.com/iluwatar/java-design-patterns)
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- [Java](https://github.com/TheAlgorithms/Java)
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- [Java 核心技术面试精讲](https://time.geekbang.org/column/intro/82)
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- [Java 性能调优实战](https://time.geekbang.org/column/intro/100028001)
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- [Java 业务开发常见错误 100 例](https://time.geekbang.org/column/intro/100047701)
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- [深入拆解 Java 虚拟机](https://time.geekbang.org/column/intro/100010301)
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- [Java 并发编程实战](https://time.geekbang.org/column/intro/100023901)
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- **面试**
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- [CS-Notes](https://github.com/CyC2018/CS-Notes)
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- [JavaGuide](https://github.com/Snailclimb/JavaGuide)
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- [advanced-java](https://github.com/doocs/advanced-java)
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## 🚪 传送
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◾ 🏠 [JAVACORE 首页](https://github.com/dunwu/javacore) ◾ 🎯 [我的博客](https://github.com/dunwu/blog) ◾

‎docs/advanced/java-crypto.md

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# Java 编码和加密
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> **📦 本文以及示例源码已归档在 [javacore](https://github.com/dunwu/javacore/)**
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>
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> 关键词：`Base64`、`消息摘要`、`数字签名`、`对称加密`、`非对称加密`、`MD5`、`SHA`、`HMAC`、`AES`、`DES`、`DESede`、`RSA`
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<!-- TOC depthFrom:2 depthTo:3 -->
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