Why no static methods in Interfaces, but static fields and inner classes OK? [pre-Java8] [duplicate]

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An official proposal has been made to allow static methods in interfaces in Java 7. This proposal is being made under Project Coin.

My personal opinion is that it’s a great idea. There is no technical difficulty in implementation, and it’s a very logical, reasonable thing to do. There are several proposals in Project Coin that I hope will never become part of the Java language, but this is one that could clean up a lot of APIs. For example, the Collections class has static methods for manipulating any List implementation; those could be included in the List interface.

Update: In the Java Posse Podcast #234, Joe D’arcy mentioned the proposal briefly, saying that it was “complex” and probably would not make it in under Project Coin.

Update: While they didn’t make it into Project Coin for Java 7, Java 8 does support static functions in interfaces.

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