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javalambdajava-8functional-interface

Java function signature for (() -> {})

What's a valid function signature for funSig?

funSig(() -> System.out.println());
Solution

  • A Runnable would work,

    It matches a void return and no params.

    Runnable runnable = () -> System.out.println();

    And obviously it doesn't need to be Runnable, any Functional Interface that matches the signature will do.