techindepth

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

@Component({
  selector: 'app-root',
  template: `
    <h1>My App</h1>
    <nav>
      <a routerLink="eager">Eager</a>
      <a routerLink="lazy">Lazy</a>
    </nav>

techindepth

import { ModuleWithProviders } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { EagerComponent } from './eager.component';

const routes: Routes = [
  { path: '', redirectTo: 'eager', pathMatch: 'full' },
  { path: 'eager', component: EagerComponent },
  { path: 'lazy', loadChildren: 'lazy/lazy.module#LazyModule' }
];

techindepth

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

@Component({
  template: '<p>Eager Component</p>'
})
export class EagerComponent {}

techindepth

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

import { LazyComponent }   from './lazy.component';
import { routing } from './lazy.routing';

@NgModule({
  imports: [routing],
  declarations: [LazyComponent]
})
export class LazyModule {}

techindepth

import { ModuleWithProviders } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { LazyComponent } from './lazy.component';

const routes: Routes = [
  { path: '', component: LazyComponent }
];

techindepth

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

@Component({
  template: '<p>Lazy Component</p>'
})
export class LazyComponent {}

techindepth

public interface Selector {
	public void registerObserver(Observer observer);
	public void removeObserver(Observer observer);
	public void notifyObservers();

}

techindepth

public interface Observer {
	public void update(String status);
}

techindepth

import java.util.ArrayList;
import java.util.List;

public class FlipkartMINote5Pro implements Selector{
	
	private List<Observer> observers = new ArrayList<Observer>();
	
	private String productStatus;
	
	

techindepth

public class AkhilCustomer implements Observer {

	@Override
	public void update(String status) {
		if(status.equals("Available"))
		System.out.println("Akhil: Its too Late, I am not planning to buy the phone!!!!");
		
	}

}