gvsharma

// Enable component-scanning and auto-configuration with @SpringBootApplication Annotation
// It combines @Configuration + @ComponentScan + @EnableAutoConfiguration
@SpringBootApplication
public class FooApplication {
  public static void main(String[] args) {
    // Bootstrap the application
    SpringApplication.run(FooApplication.class, args);
  }
}

gvsharma

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

gvsharma

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

gvsharma

	public class CustomFragmentsPresenter : MvxFragmentsPresenter
	{
		public interface IMvxFragmentHostEx : IMvxFragmentHost
		{
			void Close(IMvxViewModel viewModel);
			void ChangePresentation (MvxPresentationHint hint);
		}

		private IMvxNavigationSerializer _serializer;

gvsharma

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
					   xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
					   x:Class="Monkeys.Views.MonkeysPage"
             xmlns:local="clr-namespace:Monkeys.Views;assembly=Monkeys"
             Title="Monkeys">
  <ListView x:Name="list" 
            ItemsSource="{Binding MonkeysGrouped}" 
            ItemTapped="OnItemSelected"
            IsGroupingEnabled="True"

gvsharma

using System;
using System.Linq;
using Xamarin.Forms;
using System.Collections.Generic;
using System.ComponentModel;

namespace SampleApp
{
  // Inherit from this page to get a multi-select option in XF
	public class SelectMultipleBasePage<T> : ContentPage

gvsharma

public class CustomAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
    //our items
    List<Generic> items = new Arraylist<>();
    //headers
    List<View> headers = new ArrayList<>();
    //footers
    List<View> footers = new ArrayList<>();

    public static final int TYPE_HEADER = 111;
    public static final int TYPE_FOOTER = 222;

gvsharma

public class BlurUtil {

    public static Bitmap blur(Context context, Bitmap sentBitmap, int radius) {

        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN) {
            Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);

            final RenderScript rs = RenderScript.create(context);
            final Allocation input = Allocation.createFromBitmap(rs, sentBitmap, Allocation.MipmapControl.MIPMAP_NONE,
                    Allocation.USAGE_SCRIPT);

gvsharma

import java.io.UnsupportedEncodingException;
import java.util.Map;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;