You can declare a button first as a variable or define it directly in the parent object's content attribute. Listing 9 displays the definition of the Back button

可以首先将一个按钮声明为一个变量，或者直接在其父对象的 content 属性中定义它。

youdao

If you find this really annoying or want to do some quick prototyping, you could consider Guice's built-in @Named annotation, which accepts a string attribute. Listing 14 illustrates that alternative

如果您觉得这很繁琐，或者需要执行快速的原型设计，可以考虑 Guice 的内置 @Named 注释，它接受一个字符串属性。

youdao