Unable to generate Discriminator class as Interface

I want to create an Interface as abstract (sampleObjectResponse.class) class using this schema and have subclasses as(Object1, Object2 :

something like :

public interface SampleObjectResponse {

String getObjectType();
}

public class Object1 implements SampleObjectResponse {
@SerializedName("objectType")
private String objectType = null;

public Object1 objectType(String objectType) {
this.objectType = objectType;
return this;
}

public class Object2 implements SampleObjectResponse {
@SerializedName("objectType")
private String objectType = null;

public Object2 objectType(String objectType) {
this.objectType = objectType;
return this;
}

using schema :

components:
  schemas:
    Pet:
      type: object
      required:
        - id
        - name
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
          x-constraints: "@Capitalized(required = true)"

    sampleObjectResponse:
      discriminator:
        propertyName: objectType
        mapping:
          obj1: '#/components/schemas/Object1'
          obj2: '#/components/schemas/Object2'
      oneOf:
        - $ref: '#/components/schemas/Object1'
        - $ref: '#/components/schemas/Object2'
    Object1:
      required:
        - objectType
      type: object
      properties:
        objectType:
          type: string
    Object2:
      required:
        - objectType
      type: object
      properties:
        objectType:
          type: string