Group

Type Parameters:

E - Type of element stored in the group.

All Known Subinterfaces:

Set<E>

All Known Implementing Classes:

ButtonGroup, EnumSet, HashSet, ImmutableSet, RadioButtonGroup, SetAdapter, SynchronizedSet, TaskGroup
```
public interface Group<E>
```
Interface representing a group of unique elements.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`add(E element)`	Adds an element to the group.
`boolean`	`contains(E element)`	Tests the existence of an element in the group.
`boolean`	`remove(E element)`	Removes an element from the group.

- Method Detail
  - add
```
boolean add(E element)
```
    Adds an element to the group.
    
    Parameters:
    
    element - The element to add to the group.
    
    Returns:
    
    true if the element was added to the group; false, otherwise.
  - remove
```
boolean remove(E element)
```
    Removes an element from the group.
    
    Parameters:
    
    element - The element to remove from the set.
    
    Returns:
    
    true if the element was removed from the group; false, otherwise.
  - contains
```
boolean contains(E element)
```
    Tests the existence of an element in the group.
    
    Parameters:
    
    element - The element whose presence in the group is to be tested.
    
    Returns:
    
    true if the element exists in the group; false, otherwise.