springboot-angular-app-demo/src/main/ng-app/src/app/app.component.ts

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'ng-app created by guide "Building a Web App using Spring Boot and Angular9-CLI with Maven"';
}