[英]Object <? implements InterfaceA, InterfaceB>
I need a object who refers to two diffenrent interfaces like this: 我需要一个引用两个不同接口的对象,如下所示:
interface InterfaceA {
public void a();
}
interface InterfaceB {
public void b();
}
class Test() {
Object <? implements InterfaceA, InterfaceB>; object;
Test() {
object.a();
object.b();
}
}
I know for inheritance there is this way: Class <? extends Main> a
我知道继承是这样的: Class <? extends Main> a
Class <? extends Main> a
and a solution could be a helper class: class Helperclass implements InterfaceA, InterfaceB{}
Class <? extends Main> a
并且解决方案可以是帮助程序类: class Helperclass implements InterfaceA, InterfaceB{}
Thanks for help and reading :) 感谢您的帮助和阅读:)
If you add a generic type parameter to your Test
class, you can require that this type parameter implement both interfaces: 如果将通用类型参数添加到Test
类,则可以要求此类型参数实现两个接口:
class Test<T extends InterfaceA & InterfaceB> {
T object;
Test() {
object.a();
object.b();
}
}
Of course you should initialize the object
variable before calling methods. 当然,您应该在调用方法之前初始化object
变量。
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