define arraylist

The system. Collections namespace contains interfaces and classes that define a set of objects (such as lists, queues, bit arrays, hash tables, and dictionaries.System. collections. the generic namespace contains interfaces and classes that define a

Considerations for using the set: 1,Objects can only be referenced in a set, and Native data types cannot be placed., We need to use native data type packaging classes to add them to the Set (jdk5 will automatically perform the packing and unpacking

First, ArrayList source analysis (JDK7) ArrayList internal maintenance of a dynamic object array, ArrayList dynamic additions and deletions is to the group's dynamic additions and deletions. 1, ArrayList Construction and initialization

Turn from: http://www.cnblogs.com/hnrainll/archive/2013/04/08/3006638.html The difference between the Set,list,map,vector,arraylist The difference between the Set,list,map,vector,arraylist Java Container---List,map,setCollection├list│├linkedlist│

Java Container---List,map,setCollection├list│├linkedlist│├arraylist│└vector│└stack└setMap├hashtable├hashmap└weakhashmapThe collection interface   Collection is the most basic collection interface, and a collection represents a set of object, the

Arraylist and hashmap are asynchronous, while vector and hashtable are synchronous. Therefore, vector and hashtable are thread-safe, while arraylist and hashmap are not thread-safe.Because synchronization takes machine time, the execution efficiency

Differences and usages of Java ArrayList, vectors, and linkedlist (RPM)ArrayList and Vector is to take the array format to store data, this array element is larger than the actual data stored in order to grow and insert elements, both allow the

Differences and usages of Java ArrayList, vectors, and linkedlist (RPM)ArrayList and Vector is to take the array format to store data, this array element is larger than the actual data stored in order to grow and insert elements, both allow the

Second, array list--arraylist　　　　1. Construction methodArrayList is a dynamic array in Java, and the underlying implementation is an array of objects, except that the capacity of the array changes depending on the situation.It has a constructor with

1. Fail-fast Introduction"Fast Fail" is fail-fast, which is an error detection mechanism for Java collections. When a thread iterates over collection, it does not allow other threads to make structural changes to the collection.For example, suppose