SetChangeListener.Change (Java SE 9 & JDK 9 )

java.lang.Object
- javafx.collections.SetChangeListener.Change<E>

Type Parameters:

E - element type

Enclosing interface:

SetChangeListener<E>
```
public abstract static class SetChangeListener.Change<E>
extends Object
```
An elementary change done to an ObservableSet. Change contains information about an add or remove operation. Note that adding element that is already in the set does not modify the set and hence no change will be generated.

Since:

JavaFX 2.1

Constructor Summary

Constructors
Constructor Description

Change(ObservableSet<E> set)
Constructs a change associated with a set.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract E`	`getElementAdded()`	Get the new element.
`abstract E`	`getElementRemoved()`	Get the old element.
`ObservableSet<E>`	`getSet()`	An observable set that is associated with the change.
`abstract boolean`	`wasAdded()`	If this change is a result of add operation.
`abstract boolean`	`wasRemoved()`	If this change is a result of removal operation.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Change
```
public Change(ObservableSet<E> set)
```
    Constructs a change associated with a set.
    
    Parameters:
    
    set - the source of the change
- Method Detail
  - getSet
```
public ObservableSet<E> getSet()
```
    An observable set that is associated with the change.
    
    Returns:
    
    the source set
  - wasAdded
```
public abstract boolean wasAdded()
```
    If this change is a result of add operation.
    
    Returns:
    
    true if a new element was added to the set
  - wasRemoved
```
public abstract boolean wasRemoved()
```
    If this change is a result of removal operation.
    
    Returns:
    
    true if an old element was removed from the set
  - getElementAdded
```
public abstract E getElementAdded()
```
    Get the new element. Return null if this is a removal.
    
    Returns:
    
    the element that was just added
  - getElementRemoved
```
public abstract E getElementRemoved()
```
    Get the old element. Return null if this is an addition.
    
    Returns:
    
    the element that was just removed