Collection
概述
The root interface in the <i>collection hierarchy</i>.
A collection represents a group of objects, known as its <i>elements</i>.
Some collections allow duplicate elements and others do not.
Some are ordered and others unordered.
The JDK does not provide any <i>direct</i> implementations of this interface: it provides implementations of more specific subinterfaces like <tt>Set</tt> and <tt>List</tt>.
This interface is typically used to pass collections around and manipulate them where maximum generality is desired.
集合的root接口;
collection代表一组对象,称对象为元素;
jdk没有提供直接的collection的实现,提供了子接口:Set、List;
public interface Collection<E> extends Iterable<E> { Iterator<E> iterator(); }
Iterable
概述
Implementing this interface allows an object to be the target of the "for-each loop" statement.
实现Iterable,允许一个对象进行遍历;
public interface Iterable<T> { Iterator<T> iterator(); }
标签:implementations,collection,collections,Collection,interface,Iterable From: https://www.cnblogs.com/anpeiyong/p/17822631.html