Observable (MIPAV API Documentation)

All Known Implementing Classes:

DICOM_Receiver
```
public interface Observable
```
An interface for the Observable

Version:

1.0 05/11/06

Author:

Hailong Wang

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addObserver(Observer o)`	Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set.
`void`	`clearChanged()`	Marks this object as no longer having been changed.
`int`	`countObservers()`	Returns the number of the observers of this Observable object.
`void`	`deleteObserver(Observer o)`	Deletes an observer from the set of observers of this object.
`void`	`deleteObservers()`	Clears the observer list so that this object no longer has any observer.
`boolean`	`hasChanged()`	Test if this object has changed.
`void`	`notifyObservers(java.lang.Object obj)`	If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
`void`	`setChanged()`	Marks this object as having been changed.

- Method Detail
  - addObserver
```
void addObserver(Observer o)
```
    Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set.
    
    Parameters:
    
    o - an observer object.
  - clearChanged
```
void clearChanged()
```
    Marks this object as no longer having been changed.
  - countObservers
```
int countObservers()
```
    Returns the number of the observers of this Observable object.
    
    Returns:
    
    the number of the observers of this Observable object.
  - deleteObserver
```
void deleteObserver(Observer o)
```
    Deletes an observer from the set of observers of this object.
    
    Parameters:
    
    o - an observer object.
  - deleteObservers
```
void deleteObservers()
```
    Clears the observer list so that this object no longer has any observer.
  - hasChanged
```
boolean hasChanged()
```
    Test if this object has changed.
    
    Returns:
    
    true if the object has changed.
  - notifyObservers
```
void notifyObservers(java.lang.Object obj)
```
    If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
    
    Parameters:
    
    obj - the argument object
  - setChanged
```
void setChanged()
```
    Marks this object as having been changed.