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paulfranco / Kotlin Interview Questions.md
Last active October 7, 2025 18:23

Interview Questions

Kotlin

Q1: What is a primary constructor in Kotlin? ☆☆

Answer: The primary constructor is part of the class header. Unlike Java, you don't need to declare a constructor in the body of the class. Here's an example:




  


  




    


          
    

      

        
        

          

              @Diederikjh
          

          

            
                Diederikjh
                / Cryptography.java
            
            

              Last active
              May 24, 2024 04:08
            

              
                Single class that handles encryption and decryption with keys using the Android `Keystore` API. Mostly inspired by this [blog post](https://medium.com/@ericfu/securely-storing-secrets-in-an-android-application-501f030ae5a3). This was tested with API 18 and 25 level emulator (and a level 23 device).
              
          

        

      

        

  

    
    


        



  


  

        

          
          package com.example.yourapp;
        

        

          
          

        

        

          
          import android.annotation.SuppressLint;
        

        

          
          import android.content.Context;
        

        

          
          import android.content.SharedPreferences;
        

        

          
          import android.os.Build;
        

        

          
          import android.security.KeyPairGeneratorSpec;
        

        

          
          import android.security.keystore.KeyGenParameterSpec;
        

        

          
          import android.security.keystore.KeyProperties;
        

        

          
          import android.support.annotation.RequiresApi;
        

  





    


  




    


          
    

      

        
        

          

              @handstandsam
          

          

            
                handstandsam
                / SSLHandshakeInterceptor.java
            
            

              Created
              April 7, 2017 17:57
            

              
                OkHttp 3 SSL Handshake Interceptor - Prints TLS Version & Cipher Suite Used
              
          

        

      

        

  

    
    


        



  


  

        

          
          import android.util.Log;
        

        

          
          import java.io.IOException;
        

        

          
          import okhttp3.CipherSuite;
        

        

          
          import okhttp3.Handshake;
        

        

          
          import okhttp3.Response;
        

        

          
          import okhttp3.TlsVersion;
        

        

          
          

        

        

          
          /** Prints TLS Version and Cipher Suite for SSL Calls through OkHttp3 */
        

        

          
          public class SSLHandshakeInterceptor implements okhttp3.Interceptor {
        

        

          
              
        

  





    


  




    


          
    

      

        
        

          

              @cryzed
          

          

            
                cryzed
                / fix-infinality.md
            
            

              Last active
              September 3, 2025 06:53
            

              
                A set of instructions on how to fix the harfbuzz + Infinality issue and restoring good-looking, Infinality-like font rendering.
              
          

        

      

        

  

      

    
Disclaimer: Please follow this guide being aware of the fact that I'm not an expert regarding the things outlined below, however I made my best attempt. A few people in IRC confirmed it worked for them and the results looked acceptable.


Attention: After following all the steps run gdk-pixbuf-query-loaders --update-cache as root, this prevents various gdk-related bugs that have been reported in the last few hours. Symptoms are varied, and for Cinnamon the DE fails to start entirely while for XFCE the icon theme seemingly can't be changed anymore etc.


Check the gist's comments for any further tips and instructions, especially if you are running into problems!


Screenshots


Results after following the guide as of 11.01.2017 13:08:



  


  




    


          
    

      

        
        

          

              @swankjesse
          

          

            
                swankjesse
                / HostSelectionInterceptor.java
            
            

              Last active
              September 27, 2025 02:40
            

              
                This OkHttp application interceptor will replace the destination hostname in the request URL.
              
          

        

      

        

  

    
    


        



  


  

        

          
          import java.io.IOException;
        

        

          
          import okhttp3.HttpUrl;
        

        

          
          import okhttp3.Interceptor;
        

        

          
          import okhttp3.OkHttpClient;
        

        

          
          import okhttp3.Request;
        

        

          
          

        

        

          
          /** An interceptor that allows runtime changes to the URL hostname. */
        

        

          
          public final class HostSelectionInterceptor implements Interceptor {
        

        

          
            private volatile String host;