I'm reading Angular in Action from Manning. Chapter 2 shows me how to write my first component but the example is outdated. I can't figure out how to update it. I'm using Angular CLI version 7.1.3.

Angular CLI generates this:

```
import { Component, OnInit } from '@angular/core';
@Component({
    selector: 'app-summary',
    templateUrl: './summary.component.html',
    styleUrls: ['./summary.component.scss']
})
export class SummaryComponent implements OnInit {
    constructor() { }
    ngOnInit() {
    }
}

```

The book assumes that Angular CLI will generate this:

```
import { Component, Input } from '@angular/core';
@Component({
  selector: 'summary',
  styleUrls: ['./summary.component.css'],
  templateUrl: './summary.component.html'
})
export class SummaryComponent {
  @Input();
}

```

What is the difference between `@Input` and `OnInit`? How does a person take an input example and translate it into the "OnInit" way of doing things?