Collections工具类

Collections 是一个操作 Set、List 和 Map 等集合的工具类。Collections 中提供了一系列静态的方法对集合元素进行排序、查询和修改等操作，还提供了对集合对象设置不可变、对集合对象实现同步控制等方法。

Modifier and Type	Method	Description
static <T> void	copy(List<? super T> dest, List<? extends T> src)	Copies all of the elements from one list into another.
static <T extends Object & Comparable<? super T>>T	max(Collection<? extends T> coll)	Returns the maximum element of the given collection, according to the natural ordering of its elements.
static <T> T	max(Collection<? extends T> coll, Comparator<? super T> comp)	Returns the maximum element of the given collection, according to the order induced by the specified comparator.
static <T extends Object & Comparable<? super T>>T	min(Collection<? extends T> coll)	Returns the minimum element of the given collection, according to the natural ordering of its elements.
static <T> T	min(Collection<? extends T> coll, Comparator<? super T> comp)	Returns the minimum element of the given collection, according to the order induced by the specified comparator.
static void	reverse(List<?> list)	Reverses the order of the elements in the specified list.
static void	rotate(List<?> list, int distance)	Rotates the elements in the specified list by the specified distance.
static void	shuffle(List<?> list)	Randomly permutes the specified list using a default source of randomness.
static void	shuffle(List<?> list, Random rnd)	Randomly permute the specified list using the specified source of randomness.
static <T extends Comparable<? super T>>void	sort(List<T> list)	Sorts the specified list into ascending order, according to the natural ordering of its elements.
static <T> void	sort(List<T> list, Comparator<? super T> c)	Sorts the specified list according to the order induced by the specified comparator.