Shulou(Shulou.com)06/01 Report--

ArrayList Overview ArrayList is implemented based on arrays, is a dynamic array, and its capacity can grow automatically. ArrayList is not thread safe and can only be used in a single-threaded environment. The Serializable interface is implemented, so it supports serialization and can be transmitted through serialization; the RandomAccess interface is implemented, which supports fast random access, which is actually fast access through the subscript sequence number; and the Cloneable interface is implemented, which can be cloned. Dynamic capacity expansion

One initialization

First, there are three ways to initialize:

Public ArrayList ()

The default constructor will initialize the internal array with the default size

Public ArrayList (Collection

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