ArrayList list<t> t[] Array

ArrayList is actually a class that stores the obj list

ArrayList accepts NULL as a valid value and allows duplicate elements.

There is no guarantee that the ArrayList will be sorted. You must sort ArrayList before you perform operations that require sorting on ArrayList, such as BinarySearch.

The capacity of the ArrayList is the number of elements that ArrayList can hold. As you add elements to the ArrayList, the capacity is automatically incremented on demand by reallocating. Capacity can be reduced by calling trimtosize or by explicitly setting the capacity property.

Array

Provides methods for creating, manipulating, searching, and sorting arrays, and thus serves as the base class for all arrays in the common language runtime.

The array class is the base class for language implementations that support arrays. However, only the system and compiler can derive explicitly from the Array class. The user should use the array constructs provided by the language.

It can be seen that a class is just an abstract class, which cannot be instantiated, but it provides a lot of static methods and these static methods mostly follow the array light t[] array type is a reference type derived from the abstract base type array. It is also mentioned that only the system and compiler can be explicitly derived from the array class, so arrays are actually a class? Because there is no more explicit description, it is simply a reference type list<t>, of course, the same class. Sometimes you can feel the array of some methods List <> also feel very similar to the fact that he is just the interface with the array to have a lot of the same can see list<> inside is actually t[] so you can understand the list is more advanced package

ArrayList list<t> t[] Array