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golang里如何实现多态？

以下代码来自kubernetes:

// TODO: move this, Object, List, and Type to a different package
// ObjectMetaAccessor 接口是所有GVK都要实现的，当然包括最常用的Deployment
type ObjectMetaAccessor interface {
    // 获取GVK对象的元信息(命名空间，创建时间 etc.)
	GetObjectMeta() Object
}

ObjectMetaAccessor 

• deployment.go

// Deployment enables declarative updates for Pods and ReplicaSets.
type Deployment struct {
	metav1.TypeMeta `json:",inline"`
	// Standard object metadata.
	// (1) 可以发现：只声明了类型metav1.ObjectMeta
	// 而没有声明字段变量(e.g. metadata metav1.ObjectMeta)。
	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Specification of the desired behavior of the Deployment.
	// +optional
	Spec DeploymentSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`

	// Most recently observed status of the Deployment.
	// +optional
	Status DeploymentStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}

(1)Deploymentmetav1.ObjectMetametav1.ObjectMeta

DeploymentGetObjectMeta()Deploymentmetav1.ObjectMeta

也就是说实际调用的是这个方法：