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Android Interview Questions

Q1: Explain activity lifecycle ☆☆

Answer: As a user navigates through, out of, and back to your app, the Activity instances in your app transition through different states in their lifecycle.

To navigate transitions between stages of the activity lifecycle, the Activity class provides a core set of six callbacks: onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy(). The system invokes each of these callbacks as an activity enters a new state.

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JavaScript Interview Questions

Q1: Explain equality in JavaScript ☆

Answer: JavaScript has both strict and type–converting comparisons:

• Strict comparison (e.g., ===) checks for value equality without allowing coercion
• Abstract comparison (e.g. ==) checks for value equality with coercion allowed

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package com.codility

class University(private val repository: Repository<Student>) {
    fun getPaidCoursesWithTheNumbersOfSubscribedStudents(coursesCount: Int): Map<Course, Int> {
            val studentList = repository.get().toList();
            val courseCountMap = mutableMapOf<Course,Int>();

            studentList.forEach {
                student -> 
                student.subscribedCourses

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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:

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# import xlsxwriter module 
import xlsxwriter 
import json
import pandas as pd
from pathlib import Path
# using datetime module 
import datetime; 


#directory of all tag files with json data

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import React, { Component } from 'react';   
import { StyleSheet,TouchableOpacity, Text, TextInput, View, SafeAreaView,Alert } from 'react-native';
import Geolocation from '@react-native-community/geolocation';

class Location extends Component {
    state = {
        latitude:'',
        longitude:'',
        errorMsg:'Unable to read location, please try again later!',
        readyToLaunch:false

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Given a paragraph and a list of banned words, return the most frequent word that is not in the list of banned words.  It is guaranteed there is at least one word that isn't banned, and that the answer is unique.

Words in the list of banned words are given in lowercase, and free of punctuation.  Words in the paragraph are not case sensitive.  The answer is in lowercase.

 

Example:

Input: 
paragraph = "Bob hit a ball, the hit BALL flew far after it was hit."

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import java.util.*;
import java.lang.*;
import java.io.*;

class Viznar
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	    	int[] arr = {1,1,2,4,5,3,2,1,2};

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/*package whatever //do not write package name here */

import java.util.*;
import java.lang.*;
import java.io.*;

class GFG {
	public static void main (String[] args) {
		//code
		

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apply plugin: 'com.android.application'
def config = rootProject.ext.configuration;
def lib = rootProject.ext.libraries;

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 25