public stock: Stock 这里报错，我看见之前的提问说要从private变成public，可是依然不能实现，然后stock.component.ts那里有红波浪，ng serve 打不开

在这里输入代码
```import { Component, OnInit } from '@angular/core';
import {Stock, StockService} from '../shared/stock.service';

@Component({
  selector: 'app-stock',
  templateUrl: './stock.component.html',
  styleUrls: ['./stock.component.css']
})

 public stock: Stock;

export class StockComponent implements OnInit {

  constructor(public stockService: StockService) { }

  ngOnInit() {
    this.stock = this.stockService.getStock();
  }

}