java ee - difference between facade and business delegate pattern -

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What is the difference between mask and business representative design patterns, both are not used to hide business logic from the customer?

Delegation customer and actual execution, usually hiding / filtering / increasing some functionality of the implementation from the client .

The mask is providing a curriculum-encrypted API that hides more complex logic and / or coordination, usually several implementations that work together, and usually as the convenience of the client.

Examples of each from Java:

Representative: Collections.unmodifiableList () gives a list that keeps the original list and representatives of all the methods For a reference, but the exception breaks if its mutator methods are called.

Mask: If you've ever seen the ridiculous amount of code, the first thing you make a utility method to hide all the ugliness - this method can be considered a mask.

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