import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class AppService {

  private username: string|null;

  constructor() { 
    this.username = null;
  }

  public getUsername(): string|null {
    return this.username;
  }

  public setUsername(name: string|null): void {
    this.username = name;
  }
}