Java注解学习

public @interface aAnnotation {
    String value();
    int i();
    float f() default 2.0f;
    double d();
}

public class AnnotationTester {
    @aAnnotation(value = "hello", i = 1, f = 2.0f, d = 3.0)
    public void Method()
    {
    }
}

public @interface MarkerAnnotation {
}

public class AnnotationTester {
    @MarkerAnnotation
    public void Method()
    {
    }
}

public @interface SingleValueAnnotation {
    String value();
}

public class AnnotationTester {
    @SingleValueAnnotation("hello")
    public void Method()
    {
    }
}