有能力了，必讀，看懂注釋，眼見為實

import sun.misc.Unsafe;import java.io.FileInputStream; import java.lang.reflect.Field; import java.util.*; import java.util.concurrent.*; import java.util.concurrent.atomic.AtomicInteger; import java.util.concurrent.atomic.LongAdder; import java.util.concurrent.locks.ReentrantLock; import java.util.concurrent.locks.ReentrantReadWriteLock;/*** 這些類的源碼必須看一下* Created by Cherish on 2017/3/10.*/ public class NeedToRead {public static void main(String[] args) {String string = "原來整型字面量編譯后是這樣的，" +"調用了Integer.valueOf(i)，可以取緩存";Boolean bool = true;Byte b = 1;Character character = 'c';Short shortI = 64;Integer integer = 127;Long l = 127L;Float f = 0.0F;Double d = 0.0;Class clazz = Class.class;StringBuilder stringBuilder = new StringBuilder(16);StringBuffer stringBuffer = new StringBuffer(16);// toStringCache 有一個toString的緩存Thread thread = new Thread();ThreadLocal threadLocal = new ThreadLocal();ThreadLocalRandom random = ThreadLocalRandom.current();//TODO 每個 TreadLocal 都只是一個鍵，它對應著 .set(value);//TODO 用它本身作為鍵去 ThreadLocalMap 中獲取 valuethreadLocal.set(random);Object o = threadLocal.get();System.out.println("o = " + o.getClass());ThreadLocal threadLocal2 = new ThreadLocal();threadLocal2.set(threadLocal);Object o1 = threadLocal2.get();System.out.println("o1.getClass() = " + o1.getClass());//TODO 數據源//TODO java.util 及 concurrent 包，認真閱讀源碼TreeMap rbTree = new TreeMap();HashMap hashMap = new HashMap(8);Iterator iterator = hashMap.entrySet().iterator();ArrayList arrayList = new ArrayList();LinkedList linkedList = new LinkedList();AbstractQueue priorityQueue = new PriorityQueue();BlockingQueue lbQueue = new LinkedBlockingQueue();ConcurrentMap concurrentMap = new ConcurrentHashMap();CopyOnWriteArrayList copyOnWriteArrayList = new CopyOnWriteArrayList();AtomicInteger atomicInteger = new AtomicInteger();LongAdder longAdder = new LongAdder();ReentrantLock lock = new ReentrantLock();ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock();ExecutorService executorService = Executors.newFixedThreadPool(5);ForkJoinPool forkJoin = new ForkJoinPool();ExecutorService threadPoolExecutor =new ThreadPoolExecutor(5, 10, 5,TimeUnit.SECONDS, new LinkedBlockingQueue<>());FutureTask futureTask = new FutureTask<>(()-> new Random().nextInt(100));final String returnObj = "";futureTask = new FutureTask<>(() -> {}, returnObj);CompletableFuture<String> completableFuture = CompletableFuture.supplyAsync(() -> {return "Hello CompletableFuture!";});CompletableFuture future = completableFuture.thenAccept(o2 -> {System.out.println("thenAccept: " + o2);});FileInputStream fileInputStream;// 策略模式，裝飾者模式Field theUnsafe = null;try {theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");theUnsafe.setAccessible(true);final Unsafe UNSAFE = (Unsafe) theUnsafe.get(null);System.out.println(UNSAFE);} catch (NoSuchFieldException | IllegalAccessException e) {e.printStackTrace();}} }

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