/* reverse(List): Reverse the order of elements in a List
* shuffle(List): Random sorting of List set elements
* sort(List): Sort the elements of a specified List collection in ascending order according to the natural order of the elements
* sort(List,Comparator): List collection elements are generated in the order specified by the Comparator
* Sort
* swap(List,int,int): Exchanges elements at i and j in the specified list collection
* Object max(Collection): Returns the largest element in a given set according to the natural order of the elements
* Object max(Collecton,Comparator) returns to a given set in the order specified by the Coparator
* Maximum element
* Object min(Collection):
* Object min(Collection,Comparator)
* int frequency(Collection,Object) returns the number of occurrences of a specified element in a specified collection
* void copy(List dest,list src) copies the contents of Src into dest
* Boolean replaceAll (List, Object oldAal, Object newVAL): Replace List with a new value
* All old values
*
*
*/

```java
public class TestCollections {
	/*reverse(List):Reverse the order of elements in a List
	 * shuffle(List):Random Sorting of List Set Elements
	 * sort(List):Sort the elements of the specified List collection in ascending order according to the natural order of the elements
	 * sort(List,Comparator): List collection elements in the order generated by the specified Comparator
	 * Sort
	 * swap(List,int,int): Exchange elements at i and j in the specified list set
	 * Object max(Collection):Returns the largest element in a given set according to its natural order
	 * Object max(Collecton,Comparator)Returns to a given set in the order specified by Coparator
	 * Maximum element
	 * Object min(Collection): 
	 * Object min(Collection,Comparator)
	 * int frequency(Collection,Object)Returns the number of occurrences of the specified element in the specified collection
	 * void copy(List dest,list src)Copy the contents of Src into dest
	 * boolean replaceAll(List list,Object oldAal,Object newVAL):Replace List with a new value
	 * All old values
	 * 
	 * 
	 */
	@Test
	public void testCollectons1() {
		List list = new ArrayList();
		list.add(123);
		list.add(456);
		list.add(12);
		list.add(78);
		System.out.println(list);
		Collections.reverse(list);
		System.out.println(list);
		Collections.shuffle(list);
		System.out.println(list);
		Collections.sort(list);
		System.out.println(list);
		Collections.swap(list, 0, 1);
		System.out.println(list);
		List list1 = Arrays.asList(new Object[list.size()]);
		Collections.copy(list1, list);
		System.out.println(list1);
	}
	@Test
	public void test0() {
		List list = new ArrayList();
		list.add(123);
		list.add(456);
		list.add(12);
		list.add(78);
		Object obj = Collections.max(list);
		System.out.println(obj);
		int count = Collections.frequency(list, 456);
		System.out.println(count);
		//Ensure the thread security of list by following methods.
		List list2 = Collections.synchronizedList(list);
		System.out.println(list2);
		Collections.replaceAll(list2, 456, new Person("Lu Ben Wei",22));
		System.out.println(list2);
	}
}