Java 工程師成神之路
阿新 • • 發佈：2018-12-24
http://www.hollischuang.com/archives/489
https://linux.cn/article-6739-1.html
https://linux.cn/article-6739-1.html
一、基礎篇
1.1 JVM
1.1.1. Java記憶體模型，Java記憶體管理，Java堆和棧，垃圾回收
1.1.2. 瞭解JVM各種引數及調優
1.1.3. 學習使用Java工具
1.1.4. 學習Java診斷工具
1.1.5. 自己編寫各種outofmemory，stackoverflow程式
HeapOutOfMemory
Young OutOfMemory
MethodArea OutOfMemory
ConstantPool OutOfMemory
DirectMemory OutOfMemory
Stack OutOfMemory
Stack OverFlow
1.1.6. 使用工具嘗試解決以下問題，並寫下總結
當一個Java程式響應很慢時如何查詢問題
當一個Java程式頻繁FullGC時如何解決問題，如何檢視垃圾回收日誌
當一個Java應用發生OutOfMemory時該如何解決，年輕代、年老代、永久代解決辦法不同，導致原因也不同
1.1.7. 參考資料
1.2. Java基礎知識
1.2.1. 閱讀原始碼
java.lang.String
java.lang.Integer
java.lang.Long
java.lang.Enum
java.math.BigDecimal
java.lang.ThreadLocal
java.lang.ClassLoader & java.net.URLClassLoader
java.util.ArrayList & java.util.LinkedList
java.util.HashMap & java.util.LinkedHashMap & java.util.TreeMap
java.util.HashSet & java.util.LinkedHashSet & java.util.TreeSet
1.2.2. 熟悉Java中各種變數型別
1.2.3. 熟悉Java String的使用，熟悉String的各種函式
1.2.4. 熟悉Java中各種關鍵字
1.2.5. 學會使用List，Map，Stack，Queue，Set
上述資料結構的遍歷
上述資料結構的使用場景
Java實現對Array/List排序
java.uti.Arrays.sort()
java.util.Collections.sort()
Java實現對List去重
Java實現對List去重，並且需要保留資料原始的出現順序
Java實現最近最少使用cache，用LinkedHashMap
1.2.6. Java IO&Java NIO，並學會使用
java.io.*
java.nio.*
nio和reactor設計模式
檔案編碼，字符集
1.2.7. Java反射與javassist
反射與工廠模式
java.lang.reflect.*
1.2.8. Java序列化
java.io. Serializable
什麼是序列化，為什麼序列化
序列化與單例模式
google序列化protobuf
1.2.9. 虛引用，弱引用，軟引用
java.lang.ref.*
實驗這些引用的回收
1.2.10. 熟悉Java系統屬性
java.util.Properties
1.2.11. 熟悉Annotation用法
java.lang.annotation.*
1.2.12. JMS
javax.jms.*
1.2.13. JMX
java.lang.management.*
javax.management.*
1.2.14. 泛型和繼承，泛型和擦除
1.2.15. 自動拆箱裝箱與位元組碼
1.2.16. 實現Callback
1.2.17. java.lang.Void類使用
1.2.18. Java Agent，premain函式
java.lang.instrument
1.2.19. 單元測試
1.2.20. Java實現通過正則表示式提取一段文字中的電子郵件，並將@替換為#輸出
java.lang.util.regex.*
1.2.21. 學習使用常用的Java工具庫
commons.lang, commons.*…
guava-libraries
netty
1.2.22. 什麼是API&SPI
1.2.23. 參考資料
1.3. Java併發程式設計
1.3.1. 閱讀原始碼，並學會使用
java.lang.Thread
java.lang.Runnable
java.util.concurrent.Callable
java.util.concurrent.locks.ReentrantLock
java.util.concurrent.locks.ReentrantReadWriteLock
java.util.concurrent.atomic.Atomic*
java.util.concurrent.Semaphore
java.util.concurrent.CountDownLatch
java.util.concurrent.CyclicBarrier
java.util.concurrent.ConcurrentHashMap
java.util.concurrent.Executors
1.3.2. 學習使用執行緒池，自己設計執行緒池需要注意什麼
1.3.3. 鎖
什麼是鎖，鎖的種類有哪些，每種鎖有什麼特點，適用場景是什麼
在併發程式設計中鎖的意義是什麼
1.3.4. synchronized的作用是什麼，synchronized和lock
1.3.5. sleep和wait
1.3.6. wait和notify
1.3.7. 寫一個死鎖的程式
1.3.8. 什麼是守護執行緒，守護執行緒和非守護執行緒的區別以及用法
1.3.9. volatile關鍵字的理解
1.3.10. 以下程式碼是不是執行緒安全？為什麼？如果為count加上volatile修飾是否能夠做到執行緒安全？你覺得該怎麼做是執行緒安全的？
<ol class="linenums"><li class="L0"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Sample</span><span class="pun">{</span>
<span class="pln"> </span><span class="kwd">private</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> count </span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span>
<span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> increment</span><span class="pun">(){</span>
<span class="pln"> count</span><span class="pun">++;</span>
<span class="pln"> </span><span class="pun">}</span>
<span class="pun">}</span></code></li></ol>
1.3.11. 解釋一下下面兩段程式碼的差別
<ol class="linenums"><li class="L0"><code>// 程式碼1</code></li><li class="L1"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Sample</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L2"><code><span class="pln"> </span><span class="kwd">private</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> count </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span></code></li><li class="L3"><code><span class="pln"> synchronized </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> increment</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L4"><code><span class="pln"> count</span><span class="pun">++;</span></code></li><li class="L5"><code><span class="pln"> </span><span class="pun">}</span></code></li><li class="L6"><code>}</code></li><li class="L7"><code></code>
</li><li class="L8"><code>// 程式碼2</code></li><li class="L9"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Sample</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L0"><code><span class="pln"> </span><span class="kwd">private</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="typ">AtomicInteger</span><span class="pln"> count </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">AtomicInteger</span><span class="pun">(</span><span class="lit">0</span><span class="pun">);</span></code></li><li class="L1"><code><span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> increment</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L2"><code><span class="pln"> count</span><span class="pun">.</span><span class="pln">getAndIncrement</span><span class="pun">();</span></code></li><li class="L3"><code><span class="pln"> </span><span class="pun">}</span></code></li><li class="L4"><code>}</code></li></ol>
1.3.12. 參考資料
二、 進階篇
2.1. Java底層知識
2.1.1. 學習瞭解位元組碼、class檔案格式
2.1.2. 寫一個程式要求實現javap的功能（手工完成，不借助ASM等工具）
如Java原始碼：
<ol class="linenums"><li class="L0"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L1"><code><span class="pln"> </span><span class="kwd">int</span><span class="pln"> i </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span></code></li><li class="L2"><code><span class="pln"> i </span><span class="pun">+=</span><span class="pln"> </span><span class="lit">1</span><span class="pun">;</span></code></li><li class="L3"><code><span class="pln"> i </span><span class="pun">*=</span><span class="pln"> </span><span class="lit">1</span><span class="pun">;</span></code></li><li class="L4"><code><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="pln">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="pln">i</span><span class="pun">);</span></code></li><li class="L5"><code>}</code></li></ol>
編譯後讀取class檔案輸出以下程式碼：
<ol class="linenums"><li class="L0"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="pln">java</span><span class="pun">.</span><span class="pln">lang</span><span class="pun">.</span><span class="typ">String</span><span class="pun">[]);</span></code></li><li class="L1"><code><span class="pln"> </span><span class="typ">Code</span><span class="pun">:</span></code></li><li class="L2"><code><span class="pln"> </span><span class="typ">Stack</span><span class="pun">=</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="typ">Locals</span><span class="pun">=</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="typ">Args_size</span><span class="pun">=</span><span class="lit">1</span></code></li><li class="L3"><code><span class="pln"> </span><span class="lit">0</span><span class="pun">:</span><span class="pln"> iconst_0</span></code></li><li class="L4"><code><span class="pln"> </span><span class="lit">1</span><span class="pun">:</span><span class="pln"> istore_1</span></code></li><li class="L5"><code><span class="pln"> </span><span class="lit">2</span><span class="pun">:</span><span class="pln"> iinc </span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">1</span></code></li><li class="L6"><code><span class="pln"> </span><span class="lit">5</span><span class="pun">:</span><span class="pln"> iload_1</span></code></li><li class="L7"><code><span class="pln"> </span><span class="lit">6</span><span class="pun">:</span><span class="pln"> iconst_1</span></code></li><li class="L8"><code><span class="pln"> </span><span class="lit">7</span><span class="pun">:</span><span class="pln"> imul</span></code></li><li class="L9"><code><span class="pln"> </span><span class="lit">8</span><span class="pun">:</span><span class="pln"> istore_1</span></code></li><li class="L0"><code><span class="pln"> </span><span class="lit">9</span><span class="pun">:</span><span class="pln"> getstatic </span><span class="com">#</span><span class="lit">2</span><span class="pun">;</span><span class="pln"> </span><span class="com">//Field java/lang/System.out:Ljava/io/PrintStream;</span></code></li><li class="L1"><code><span class="pln"> </span><span class="lit">12</span><span class="pun">:</span><span class="pln"> iload_1</span></code></li><li class="L2"><code><span class="pln"> </span><span class="lit">13</span><span class="pun">:</span><span class="pln"> invokevirtual </span><span class="com">#</span><span class="lit">3</span><span class="pun">;</span><span class="pln"> </span><span class="com">//Method java/io/PrintStream.println:(I)V</span></code></li><li class="L3"><code><span class="pln"> </span><span class="lit">16</span><span class="pun">:</span><span class="pln"> </span><span class="kwd">return</span></code></li><li class="L4"><code><span class="pln"> </span><span class="typ">LineNumberTable</span><span class="pun">:</span><span class="pln"> </span></code></li><li class="L5"><code><span class="pln"> line </span><span class="lit">4</span><span class="pun">:</span><span class="pln"> </span><span class="lit">0</span></code></li><li class="L6"><code><span class="pln"> line </span><span class="lit">5</span><span class="pun">:</span><span class="pln"> </span><span class="lit">2</span></code></li><li class="L7"><code><span class="pln"> line </span><span class="lit">6</span><span class="pun">:</span><span class="pln"> </span><span class="lit">5</span></code></li><li class="L8"><code><span class="pln"> line </span><span class="lit">7</span><span class="pun">:</span><span class="pln"> </span><span class="lit">9</span></code></li><li class="L9"><code><span class="pln"> line </span><span class="lit">8</span><span class="pun">:</span><span class="pln"> </span><span class="lit">16</span></code></li></ol>
2.1.3. CPU快取，L1，L2，L3和偽共享
2.1.4. 什麼是尾遞迴
2.1.5. 熟悉位運算
用位運算實現加、減、乘、除、取餘
2.1.6. 參考資料
2.2. 設計模式
2.2.1. 實現AOP
2.2.2. 使用模板方法設計模式和策略設計模式實現IOC
2.2.3. 不用synchronized和lock，實現執行緒安全的單例模式
2.2.4. nio和reactor設計模式
2.2.5. 參考資料
2.3. 網路程式設計知識
2.3.1. Java RMI，Socket，HttpClient
2.3.2. 用Java寫一個簡單的靜態檔案的HTTP伺服器
實現客戶端快取功能，支援返回304
實現可併發下載一個檔案
使用執行緒池處理客戶端請求
使用nio處理客戶端請求
支援簡單的rewrite規則
上述功能在實現的時候需要滿足“開閉原則”
2.3.3. 瞭解nginx和apache伺服器的特性並搭建一個對應的伺服器
2.3.4. 用Java實現FTP、SMTP協議
2.3.5. 什麼是CDN？如果實現？DNS起到什麼作用？
2.3.6. 參考資料
2.4. 框架知識
spring，spring mvc，閱讀主要原始碼
ibatis，閱讀主要原始碼
用spring和ibatis搭建java server
2.5. 應用伺服器知識
三、 高階篇
3.1. 編譯原理知識
3.1.1. 用Java實現以下表達式解析並返回結果（語法和Oracle中的select sysdate-1 from dual類似）
<ol class="linenums"><li class="L0"><code>sysdate</code></li><li class="L1"><code><span class="pln">sysdate </span><span class="pun">-</span><span class="lit">1</span></code></li><li class="L2"><code><span class="pln">sysdate </span><span class="pun">-</span><span class="lit">1</span><span class="pun">/</span><span class="lit">24</span></code></li><li class="L3"><code><span class="pln">sysdate </span><span class="pun">-</span><span class="lit">1</span><span class="pun">/(</span><span class="lit">12</span><span class="pun">*</span><span class="lit">2</span><span class="pun">)</span></code></li></ol>
3.1.2. 實現對一個List通過DSL篩選
<ol class="linenums"><li class="L0"><code><span class="typ">QList</span><span class="pun"><</span><span class="typ">Map</span><span class="pun"><</span><span class="typ">String</span><span class="pun">,</span><span class="pln"> </span><span class="typ">Object</span><span class="pun">>></span><span class="pln"> mapList </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">QList</span><span class="pun"><</span><span class="typ">Map</span><span class="pun"><</span><span class="typ">String</span><span class="pun">,</span><span class="pln"> </span><span class="typ">Object</span><span class="pun">>>;</span></code></li><li class="L1"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">add</span><span class="pun">({</span><span class="str">"name"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"hatter test"</span><span class="pun">});</span></code></li><li class="L2"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">add</span><span class="pun">({</span><span class="str">"id"</span><span class="pun">:</span><span class="pln"> </span><span class="pun">-</span><span class="lit">1</span><span class="pun">,</span><span class="str">"name"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"hatter test"</span><span class="pun">});</span></code></li><li class="L3"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">add</span><span class="pun">({</span><span class="str">"id"</span><span class="pun">:</span><span class="pln"> </span><span class="lit">0</span><span class="pun">,</span><span class="pln"> </span><span class="str">"name"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"hatter test"</span><span class="pun">});</span></code></li><li class="L4"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">add</span><span class="pun">({</span><span class="str">"id"</span><span class="pun">:</span><span class="pln"> </span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="str">"name"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"test test"</span><span class="pun">});</span></code></li><li class="L5"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">add</span><span class="pun">({</span><span class="str">"id"</span><span class="pun">:</span><span class="pln"> </span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="str">"name"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"hatter test"</span><span class="pun">});</span></code></li><li class="L6"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">add</span><span class="pun">({</span><span class="str">"id"</span><span class="pun">:</span><span class="pln"> </span><span class="lit">3</span><span class="pun">,</span><span class="pln"> </span><span class="str">"name"</span><span class="pun">:</span><span class="pln"> </span><span class="str">"test hatter"</span><span class="pun">});</span></code></li><li class="L7"><code><span class="pln">mapList</span><span class="pun">.</span><span class="pln">query</span><span class="pun">(</span><span class="str">"id is not null and id > 0 and name like '%hatter%'"</span><span class="pun">);</span></code></li></ol>
要求返回列表中匹配的物件，即最後兩個物件；
3.1.3. 用Java實現以下程式（語法和變數作用域處理都和JavaScript類似）：
程式碼：
<ol class="linenums"><li class="L0"><code><span class="kwd">var</span><span class="pln"> a </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1</span><span class="pun">;</span></code></li><li class="L1"><code><span class="kwd">var</span><span class="pln"> b </span><span class="pun">=</span><span class="pln"> </span><span class="lit">2</span><span class="pun">;</span></code></li><li class="L2"><code><span class="kwd">var</span><span class="pln"> c </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">function</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L3"><code><span class="pln"> </span><span class="kwd">var</span><span class="pln"> a </span><span class="pun">=</span><span class="pln"> </span><span class="lit">3</span><span class="pun">;</span></code></li><li class="L4"><code><span class="pln"> println</span><span class="pun">(</span><span class="pln">a</span><span class="pun">);</span></code></li><li class="L5"><code><span class="pln"> println</span><span class="pun">(</span><span class="pln">b</span><span class="pun">);</span></code></li><li class="L6"><code>};</code></li><li class="L7"><code><span class="pln">c</span><span class="pun">();</span></code></li><li class="L8"><code><span class="pln">println</span><span class="pun">(</span><span class="pln">a</span><span class="pun">);</span></code></li><li class="L9"><code><span class="pln">println</span><span class="pun">(</span><span class="pln">b</span><span class="pun">);</span></code></li></ol>
輸出：
<ol class="linenums"><li class="L0"><code>3212</code></li></ol>
3.1.4. 參考資料
3.2. 作業系統知識
Ubuntu
Centos
使用linux，熟悉shell指令碼
3.3. 資料儲存知識
3.3.1. 關係型資料庫
MySQL
如何看執行計劃
如何搭建MySQL主備
binlog是什麼
Derby，H2，PostgreSQL
SQLite
3.3.2. NoSQL
Cache
Redis
Memcached
Leveldb
Bigtable
HBase
Cassandra
Mongodb
圖資料庫
neo4j
3.3.3. 參考資料
3.4. 大資料知識
3.4.1. Zookeeper，在linux上部署zk
3.4.2. Solr，Lucene，ElasticSearch
在linux上部署solr，solrcloud，新增、刪除、查詢索引
3.4.3. Storm，流式計算，瞭解Spark，S4
在linux上部署storm，用zookeeper做協調，執行storm hello world，local和remote模式執行除錯storm topology。
3.4.4. Hadoop，離線計算
Hdfs：部署NameNode，SecondaryNameNode，DataNode，上傳檔案、開啟檔案、更改檔案、刪除檔案
MapReduce：部署JobTracker，TaskTracker，編寫mr job
Hive：部署hive，書寫hive sql，得到結果
Presto：類hive，不過比hive快，非常值得學習
3.4.5. 分散式日誌收集flume，kafka，logstash
3.4.6. 資料探勘，mahout
3.4.7. 參考資料
3.5. 網路安全知識
3.5.1. 什麼是DES、AES
3.5.2. 什麼是RSA、DSA
3.5.3. 什麼是MD5，SHA1
3.5.4. 什麼是SSL、TLS，為什麼HTTPS相對比較安全
3.5.5. 什麼是中間人攻擊、如果避免中間人攻擊
3.5.6. 什麼是DOS、DDOS、CC攻擊
3.5.7. 什麼是CSRF攻擊
3.5.8. 什麼是CSS攻擊
3.5.9. 什麼是SQL注入攻擊
3.5.10. 什麼是Hash碰撞拒絕服務攻擊
3.5.11. 瞭解並學習下面幾種增強安全的技術
3.5.12. 用openssl籤一個證書部署到apache或nginx
3.5.13. 參考資料
四、 擴充套件篇
4.1. 相關知識
4.1.1. 雲端計算，分散式，高可用，可擴充套件
4.1.2. 虛擬化
4.1.3. 監控
4.1.4. 負載均衡
4.1.5. 學習使用git
4.1.6. 學習使用maven
4.1.7. 學習使用gradle
4.1.8. 學習一個小語種語言
Groovy
Scala
LISP, Common LISP, Schema, Clojure
R
Julia
Lua
Ruby
4.1.9. 嘗試瞭解編碼的本質
瞭解以下概念
ASCII, ISO-8859-1
GB2312, GBK, GB18030
Unicode, UTF-8
不使用 String.getBytes() 等其他工具類/函式完成下面功能
<ol class="linenums"><li class="L0"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> throws </span><span class="typ">IOException</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L1"><code><span class="pln"> </span><span class="typ">String</span><span class="pln"> str </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Hello, 我們是中國人。"</span><span class="pun">;</span></code></li><li class="L2"><code><span class="pln"> byte</span><span class="pun">[]</span><span class="pln"> utf8Bytes </span><span class="pun">=</span><span class="pln"> toUTF8Bytes</span><span class="pun">(</span><span class="pln">str</span><span class="pun">);</span></code></li><li class="L3"><code><span class="pln"> </span><span class="typ">FileOutputStream</span><span class="pln"> fos </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">FileOutputStream</span><span class="pun">(</span><span class="str">"f.txt"</span><span class="pun">);</span></code></li><li class="L4"><code><span class="pln"> fos</span><span class="pun">.</span><span class="kwd">write</span><span class="pun">(</span><span class="pln">utf8Bytes</span><span class="pun">);</span></code></li><li class="L5"><code><span class="pln"> fos</span><span class="pun">.</span><span class="pln">close</span><span class="pun">();</span></code></li><li class="L6"><code>}</code></li><li class="L7"><code><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> byte</span><span class="pun">[]</span><span class="pln"> toUTF8Bytes</span><span class="pun">(</span><span class="typ">String</span><span class="pln"> str</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span></code></li><li class="L8"><code><span class="pln"> </span><span class="kwd">return</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">;</span><span class="pln"> </span><span class="com">// TODO</span></code></li><li class="L9"><code>}</code></li></ol>
想一下上面的程式能不能寫一個轉GBK的？
寫個程式自動判斷一個檔案是哪種編碼
4.1.10. 嘗試瞭解時間的本質
4.1.11. 參考資料
4.2. 擴充套件學習
4.2.1. JavaScript知識
4.2.1.1. 什麼是prototype
4.2.1.2. 什麼是閉包
看一下這段程式碼，並解釋一下為什麼按Button1時沒有alert出“This is button: 1”，如何修改：
http://jsfiddle.net/FDPj3/1/
4.2.1.3. 瞭解並學習一個JS框架
jQuery
ExtJS
ArgularJS
4.2.1.4. 寫一個Greasemonkey外掛
4.2.1.5. 學習node.js
4.2.2. 學習html5
4.2.3. 參考資料
五、 推薦書籍
《深入Java虛擬機器》
《深入理解Java虛擬機器》
《Effective Java》
《七週七語言》
《七週七資料》
《Hadoop技術內幕》
《Hbase In Action》
《Mahout In Action》
《這就是搜尋引擎》
《Solr In Action》
《深入分析Java Web技術內幕》
《大型網站技術架構》
《高效能MySQL》
《演算法導論》
《計算機程式設計藝術》
《程式碼大全》
《JavaScript權威指南》