Java

1.Java集合关系图：

2.List、Map、Set区别：

① List

	ArrayList	LinkedList	Vector
Advantage	Search	Insert、Delete	Synchronized

② Map

	HashMap	TreeMap	LinkedHashMap	Hashtable
Order	Random	Ascend by key	Insertion order	Random
Synchronized?	No	No	No	Yes
key permits null?	One	No	One	No
value permits null?	Any number	Any number	Any number	No

③ Set

	HashSet	TreeSet	LinkedHashSet
Order	Random	Ascend	Insertion
permit null?	Yes	No	Yes