アノテーションの equals とかどうなんだっけと思って調べた

compare-annotations.groovy

import java.lang.annotation.*

@Retention(RetentionPolicy.RUNTIME)
@Target([ElementType.TYPE, ElementType.METHOD])
@interface Foo {
    String bar()
    int baz()
}

@Foo(bar = 'test', baz = 1)
class Qux {
  @Foo(bar = 'test', baz = 1)
  def qux() {}
}

@Foo(bar = 'test', baz = 2)
class Waldo {

}

@Foo(bar = 'test', baz = 1)
class Corge {
}

def foo1 = Qux.getAnnotation(Foo)
def foo2 = Waldo.getAnnotation(Foo)
def foo3 = Corge.getAnnotation(Foo)

def foo1_1 = Qux.getMethod('qux').getAnnotation(Foo)

assert foo1 != foo2
assert foo1 == foo3
assert foo1 == foo1_1