class.ts

import { Chatroom, Shop } from "./interface";

export class Empty { }

export class Customer { }

export class Custom extends Customer implements Chatroom, Shop {
  connect(...args: [] | []) {
    console.log('welcome~');
  }
  buy() {
    console.log('buy successful');
  }
}

export class Car {
  drive(): void {
    // hit the gas
  }
}

export class Golfer {
  drive(): void {
    // hit the ball far
  }
}


export class Animal {
  public name: string;
  public constructor(name: string) {
    this.name = name;
  }
}


export abstract class AnimalBase {
  public name: string;
  public constructor(name: string) {
    this.name = name;
  }
  public abstract sayHi(): void;
}

export class Cat extends Animal {
  public eat() {
    console.log(`${this.name} is eating.`);
  }
}

export class Sprite {
  name: string = "";
  x: number = 0;
  y: number = 0;

  constructor(name: string) {
    this.name = name;
  }
}