Collection Framework (Unique features overview and testing of the list collection)

Package cn.itcast_03;

Import java.util.ArrayList;

Import java.util.List;

/*

* Unique features of the list collection:

* A: Add features

* void add(int index,objectElement): adding elements at the specified location

* B: Get features

* Object get(int index): gets The element at the specified position

* C: List iterator

* listiterator listiterator():List Collection-specific iterator

* D: delete function

* Object Remove (int index): Deletes the element according to the index, returns the element that was deleted , ( To delete you and return you.)

* E: Modify function

* Object set(int index,objectElement): modifies elements according to index, returns modified elements

*/

public class Listdemo {

public static void Main (string[] args) {

To Create a Collection object

List List = new ArrayList ();

adding elements

List.add ("Hello");

List.add ("World");

List.add ("Java");

void Add (int index,object Element): add element at specified position

List.add (1, "Android");//No problem

indexoutofboundsexception( index out of bounds)

List.add (One, "Java ee");//problem

List.add (3, "Java ee"); No problem

List.add (4, "Java ee"); Have a problem

Object get (int index): Gets the element at the specified position

System.out.println ("Get:" + list.get (1));

Indexoutofboundsexception (index out of bounds)

System.out.println ("Get:" + list.get (11));

Object Remove (int index): Deletes elements based on index, returns deleted elements

System.out.println ("Remove:" + list.remove (1));

Indexoutofboundsexception (index out of bounds)

System.out.println ("Remove:" + list.remove (11));

Object set (int index,object element): Modifies the element according to the index, returning the modified element

System.out.println ("set:" + list.set (1, "Java ee")); The index is starting at 0 , which means that index 0 represents the Helloin the list collection, and the result returned by this method is the world (the modified element) the element at this time is Hello,javaee,java

System.out.println ("list:" + list);

}

}

This article is from the "GD" blog, please be sure to keep this source http://wangdenghui.blog.51cto.com/9930072/1768739

Collection Framework (Unique features overview and testing of the list collection)