Collection

All Superinterfaces:

java.lang.Iterable<T>

All Known Subinterfaces:

List<T>, Map<K,V>, Queue<T>, Set<E>, Stack<T>

All Known Implementing Classes:

ArrayList, ArrayQueue, ArrayStack, BeanAdapter, CalendarDateSpinnerData, CategorySeries, Element, EnumList, EnumMap, EnumSet, FileList, FileObjectList, HashMap, HashSet, HistogramSeries, ImmutableList, ImmutableMap, ImmutableSet, LinkedList, LinkedQueue, LinkedStack, ListAdapter, MapAdapter, NumericSpinnerData, ResultList, SetAdapter, SynchronizedList, SynchronizedMap, SynchronizedQueue, SynchronizedSet, SynchronizedStack, TreeBranch, ValueSeries
```
public interface Collection<T>
extends java.lang.Iterable<T>
```
Root interface in collection hierarchy. Defines operations common to all collections.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Removes all elements from the collection.
`java.util.Comparator<T>`	`getComparator()`	Returns the collection's sort order.
`boolean`	`isEmpty()`	Tests the emptiness of the collection.
`void`	`setComparator(java.util.Comparator<T> comparator)`	Sets the collection's sort order, re-ordering the collection's contents and ensuring that new entries preserve the sort order.

Methods inherited from interface java.lang.Iterable
forEach, iterator, spliterator

- Method Detail
  - clear
```
void clear()
```
    Removes all elements from the collection.
  - isEmpty
```
boolean isEmpty()
```
    Tests the emptiness of the collection.
    
    Returns:
    
    true if the collection contains no elements; false, otherwise.
  - getComparator
```
java.util.Comparator<T> getComparator()
```
    Returns the collection's sort order.
    
    Returns:
    
    The comparator used to order elements in the collection, or null if the sort order is undefined.
    
    See Also:
    
    setComparator(Comparator)
  - setComparator
```
void setComparator(java.util.Comparator<T> comparator)
```
    Sets the collection's sort order, re-ordering the collection's contents and ensuring that new entries preserve the sort order.
    Calling this method more than once with the same comparator will re-sort the collection.
    
    Parameters:
    
    comparator - The comparator used to order elements in the collection, or null if the collection is unsorted.