你连存活到JDK8中著名的Bug都不知道,我怎么敢给你加薪

public ArrayList(Collection<? extends E> c) {

elementData = c.toArray();

size = elementData.length;

// c.toArray might (incorrectly) not return Object[] (see 6260652)

if (elementData.getClass() != Object[].class)

  elementData = Arrays.copyOf(elementData, size, Object[].class);

}

  

public CopyOnWriteArrayList(Collection<? extends E> c) {

Object[] elements = c.toArray();

// c.toArray might (incorrectly) not return Object[] (see 6260652)

if (elements.getClass() != Object[].class)

  elements = Arrays.copyOf(elements, elements.length, Object[].class); 

setArray(elements);

}

public static void test1()

{

  SubClass[] subArray = {new SubClass(), new SubClass()};

  System.out.println(subArray.getClass());

  

  // class [Lcollection.SubClass;

  BaseClass[] baseArray = subArray;

  System.out.println(baseArray.getClass());

  

  // java.lang.ArrayStoreException

  baseArray[0] = new BaseClass();

}

  

public static void test2()

{

  List<String> list = Arrays.asList("abc");

  

  // class java.util.Arrays$ArrayList

  System.out.println(list.getClass());

  

  // class [Ljava.lang.String;

  Object[] objArray = list.toArray();

  System.out.println(objArray.getClass());

  

  objArray[0] = new Object(); // cause ArrayStoreException 

}

  

public static void test3()

{

  List<String> dataList = new ArrayList<String>();

  dataList.add("one");

  dataList.add("two");

  

  Object[] listToArray = dataList.toArray();

  

  // class [Ljava.lang.Object;返回的是Object数组

  System.out.println(listToArray.getClass());

  listToArray[0] = "";

  listToArray[0] = 123;

  listToArray[0] = new Object();

    

}