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What are Observer and Observable? How it is usfull?

 
Greenhorn
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Hi,
What are Observer and Observable? How it is usfull in Real time pls explain.
 
Ranch Hand
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according to the javadoc,

A class can implement the Observer interface when it wants to be informed of changes in observable objects.


The javadoc for the Observable class tells a little bit more about it:
sun's javadoc for java.util.Observable
These are used to allow a class (the Observable) let everyone who is interested (the Observer(s)) know about a change in its status.
 
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Here is some more to read.
Java World How-To
Java World Tip
 
Consider Paul's rocket mass heater.
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