HarmonyOS ArkTS如何实现建造者模式、链式调用

链式调用示例代码：

class demo {
  private id: number = 1;
  private name: string = "aks";
  private age: number = 23;

  public getId() {
    return this.id;
  }

  public setId(id: number) {
    this.id = id;
    return this
  }

  public getName() {
    return this.name;
  }

  public setName(name: string) {
    this.name = name;
    return this
  }

  public getAge() {
    return this.age;
  }

  public setAge(age: number) {
    this.age = age;
    return this
  }
}

@Entry
@Component
struct mydemo0626 {
  @State simple: demo = new demo();

  build() {
    Row() {
      Column() {
        Text(this.simple.getAge().toString())
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            this.simple.setId(1).setName("ArkUI").setAge(12)
            console.log(JSON.stringify(this.simple));
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}