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JavaSE encapsulation & immutability

Posted on Edited on In Disqus:

Encapsulation

Encapsulation refers to preventing callers from changing the instance variables directly.

Immutability

Immutability refers to preventing callers from changing the instance variables at all. 

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/**
we still want the caller to be able to specify the initial 
value—we just don’t want it to change after the object is created.
Constructors to the rescue
*/
public class ImmutableSwan {

	private int numberEggs; 

	public ImmutableSwan(int numberEggs) {
		this.numberEggs = numberEggs; 
	} 

	public int getNumberEggs() {
		return numberEggs; 
	} 
}

Reference