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數(shù)式接口
2.1 定義
public @interface FunctionalInterface {}官方注釋?zhuān)?/p>
An informative annotation type used to indicate that an interface type declaration is intended to be a functional interface as defined by the Java Language Specification.Conceptually, a functional interface has exactly one abstract?method.?Since default methods have an implementation, they are not abstract. If an interface declares an a
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