StackListener

Type Parameters:

T - Type of object stored in this stack.

All Known Implementing Classes:

StackListener.Adapter, StackListener.Listeners
```
public interface StackListener<T>
```
Stack listener interface.

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static class`	`StackListener.Adapter<T>`	Deprecated. Since 2.1 and Java 8 the interface itself has default implementations.
`static class`	`StackListener.Listeners<T>`	Stack listeners.

Method Summary

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default void`	`comparatorChanged(Stack<T> stack, java.util.Comparator<T> previousComparator)`	Called when a stack's comparator has changed.
`default void`	`itemPopped(Stack<T> stack, T item)`	Called when an item has been popped off of a stack.
`default void`	`itemPushed(Stack<T> stack, T item)`	Called when an item has been pushed onto a stack.
`default void`	`stackCleared(Stack<T> stack)`	Called when a stack has been cleared.

- Method Detail
  - itemPushed
```
default void itemPushed(Stack<T> stack,
                        T item)
```
    Called when an item has been pushed onto a stack.
    
    Parameters:
    
    stack - The stack that has changed.
    
    item - The newly pushed item.
  - itemPopped
```
default void itemPopped(Stack<T> stack,
                        T item)
```
    Called when an item has been popped off of a stack.
    
    Parameters:
    
    stack - The stack that has changed.
    
    item - The item newly popped from the stack.
  - stackCleared
```
default void stackCleared(Stack<T> stack)
```
    Called when a stack has been cleared.
    
    Parameters:
    
    stack - The newly cleared stack.
  - comparatorChanged
```
default void comparatorChanged(Stack<T> stack,
                               java.util.Comparator<T> previousComparator)
```
    Called when a stack's comparator has changed.
    
    Parameters:
    
    stack - The stack in question.
    
    previousComparator - The previous comparator for this stack (if any).