很多java开发的小伙伴都会阅读jdk源码，然而确不知道应该从哪读起。 以下为小编整理的通常所需阅读的源码范围。 标题为包名，后面序号为优先级1-4，优先级递减

1、java.lang
Object 1
String 1
AbstractStringBuilder 1
StringBuffer 1
StringBuilder 1
Boolean 2
Byte 2
Double 2
Float 2
Integer 2
Long 2
Short 2
Thread 2
ThreadLocal 2
Enum 3
Throwable 3
Error 3
Exception 3
Class 4
ClassLoader 4
Compiler 4
System 4
Package 4
Void 4
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2、java.util
AbstractList 1
AbstractMap 1
AbstractSet 1
ArrayList 1
LinkedList 1
HashMap 1
Hashtable 1
HashSet 1
LinkedHashMap 1
LinkedHashSet 1
TreeMap 1
TreeSet 1
Vector 2
Queue 2
Stack 2
SortedMap 2
SortedSet 2
Collections 3
Arrays 3
Comparator 3
Iterator 3
Base64 4
Date 4
EventListener 4
Random 4
SubList 4
Timer 4
UUID 4
WeakHashMap 4
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3、java.util.concurrent
ConcurrentHashMap 1
Executor 2
AbstractExecutorService 2
ExecutorService 2
ThreadPoolExecutor 2
BlockingQueue 2
AbstractQueuedSynchronizer 2
CountDownLatch 2
FutureTask 2
Semaphore 2
CyclicBarrier 2
CopyOnWriteArrayList 3
SynchronousQueue 3
BlockingDeque 3
Callable 4
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4、java.util.concurrent.atomic
AtomicBoolean 2
AtomicInteger 2
AtomicLong 2
AtomicReference 3
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5、java.lang.reflect
Field 2
Method 2
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6、java.lang.annotation
Annotation 3
Target 3
Inherited 3
Retention 3
Documented 4
ElementType 4
Native 4
Repeatable 4
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7、java.util.concurrent.locks
Lock 2
Condition 2
ReentrantLock 2
ReentrantReadWriteLock 2
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8、java.io
File 3
InputStream 3
OutputStream 3
Reader 4
Writer 4
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9、java.nio
Buffer 3
ByteBuffer 4
CharBuffer 4
DoubleBuffer 4
FloatBuffer 4
IntBuffer 4
LongBuffer 4
ShortBuffer 4
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10、java.sql
Connection 3
Driver 3
DriverManager 3
JDBCType 3
ResultSet 4
Statement 4
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11、java.net
Socket 3
ServerSocket 3
URI 4
URL 4
URLEncoder 4

作者：lionfly
链接：
https://juejin.cn/post/6844904007639498766