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I was asked this question recently during my job interview, and I couldn’t answer it. So, what is the most used pattern in java.io and how is it used? What are other patterns used in common java libraries?
I guess they wanted to hear about the Decorator pattern which can be found in the various Streams, Readers and Writers.
Other patterns (small selection):
I’m pretty sure that one can find examples for almost all patterns listed on this wikipedia page in the Java SDK.