Collection 集合类，基础
1. 所有的集合操作都实现了Collection这个基类接口
2. 继承了Collection的接口有:List,Set 这2个接口
3. 实现了Collection的类有:AbstractCollection这个抽象类
4. Collection接口定义的方法解析如下:
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Method…..
1.int Size();
返回此集合中的所有元素数量
,
返回值
int,
2.boolean
isEmpty();
返回此集合中不包含的元素
,
返回值
boolean
3.boolean contains(Object o);
判断此集合中是否有某个对象，返回值
boolean
4.Iterator<E> iterator();
返回此集合的泛型迭代器
(
可以是任意类型的
),
返回值
Iterator<E>
5.Object[] toArray();
将集合转换为数组，如果该集合被迭代过，那么转换的数组与迭代后的保持一致的顺序。
6.<T>
T[] to Array(T[] a);
将集合转换为数组，返回类型为泛型
7.boolean add(E e);
添加集合元素对象，
E
对象为
Collection<E>
指定的泛型对象，返回是否添加成功
,Boolean
8.boolean
remove(Object o);
删除集合元素对象，返回是否删除成功
boolean
9.boolean containsAll(Collection<?> c)
判断此集合中的
u
所有元素是否存在于参数
C
集合中，返回值
boolean
10.boolean addAll(Collection<? Extends E> c);
把参数集合
C
的所有元素一次性
添加到此集合中，返回值
boolean
11.boolean removeAll(Collection<?> c);
删除此集合中存在于参数
C
集合中的所有元素，返回值
boolean
12.boolean
retainAll(Collection<?> c);
保留此集合中与集合参数
C
中相同的所有元素，与
removeAll
相反返回值
boolean,
13.void clear();
清空集合所有元素对象
.
14.boolean equals(Object o);
比较此集合对象与集合参数
o
对象是否相等，返回值
boolean
15int
hashCode();
返回此集合的哈希代码值
,
返回值
int.
