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Java example source code file (FunctionalInterfaceAnno.java)

This example Java source code file (FunctionalInterfaceAnno.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

functionalinterface, functionalinterfaceanno, string

The FunctionalInterfaceAnno.java Java example source code

/*
 * @test /nodynamiccopyright/
 * @summary smoke test for functional interface annotation
 * @compile/fail/ref=FunctionalInterfaceAnno.out -XDrawDiagnostics FunctionalInterfaceAnno.java
 */
class FunctionalInterfaceAnno {
    @FunctionalInterface
    static class A { } //not an interface

    @FunctionalInterface
    static abstract class B { } //not an interface

    @FunctionalInterface
    enum C { } //not an interface

    @FunctionalInterface
    @interface D { } //not an interface

    @FunctionalInterface
    interface E { } //no abstracts

    @FunctionalInterface
    interface F { default void m() { } } //no abstracts

    @FunctionalInterface
    interface G { String toString(); } //no abstracts

    @FunctionalInterface
    interface H { void m(); void n(); } //incompatible abstracts

    @FunctionalInterface
    interface I { void m(); } //ok
}

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