在子类中使用构造函数中的Builder模式

在子类中使用构造函数中的Builder模式

您可能需要考虑使用嵌套的

MySophisticatedObject.Builder

extends

MyPrimitiveObject.Builder

，并覆盖其

build()

方法。在构建器中具有受保护的构造函数，以 接受 要在其上设置值的实例：

public class MyPrimitiveObject {  private String identifier="unknown";  public static class Builder {    private final MyPrimitiveObject obj;    public MyPrimitiveObject build() { return obj; }    public Builder setidentifier (String val) {     obj.identifier = val;     return this;    }    public Builder() {        this(new MyPrimitiveObject());    }    public Builder(MyPrimitiveObject obj) {        this.obj = obj;    }  }  ...}public class MySophisticatedObject extends MyPrimitiveObject {  private String description;  public static class Builder extends MyPrimitiveObject.Builder {    private final MySophisticatedObject obj;    public Builder() {      this(new MySophisticatedObject());      super.setIdentifier(generateUUID());    }         public Builder(MySophisticatedObject obj) {      super(obj);      this.obj = obj;    }    public MySophisticatedObject build() {      return obj;    }    // Add pre to set the description etc.  }}