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