Introduction to Java

Java is an High level programming language

Java was designed by Sun Micro system in 1995 and is currently owned by Oracle

Java is platform independent which means once you write the program in java it will execute in different platforms

Java is portable, Robust and Dynamic

Java guarantees Write ones and Run anywhere

Java runs on 3 Billion devices like Android OS, web applications etc

In Java everything is an object hence it can be easily extended

Java's multi threading property enables to perform multiple tasks simultaneously

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Android Interview Questions

Android Interview Questions Which was the first mobile brand with Android Application? Answer : First Mobile brand with Android Application was HTC. What is the current version of android and its API ? Answer: Current version of android is “Pie” (as per Nov 2018) and its API level 28. Life cycle of Activity ? Answer: OnCreate() - This method is called when the activity is created . It is called only once in activity lifecycle. OnStart() - This method is called when the activity is getting started , no user interactions will be done at this stage,and this method will be called several times in activity life cycle depending upon the user navigation.(Loads UI) OnResume()- On this method call user can interact with the activity and perform actions like click. OnPause()- W...

Find the biggest difference between any two numbers in array? Approach: Assume array of integer arr = [5,9,66,8,37] Two calculate biggest difference between two numbers logic is largest number - smallest number . By arranging the array in ascending order we get the first element which is smallest and the last element which is largest. Now the array look like integer arr =[5,8,9,37,66] Here the solution is last element (largest number)- first element(smallest number) i.e; 66-5= 61 Implementing in Java /* Read input from STDIN. Print your output to STDOUT*/ import java.io.*; import java.util.*; public class BiggestDifference{ public static void main(String args[] ) throws Exception { //Takes user input Scanner sc = new Scanner(System.in); int n = sc.nextInt(); //create an array depending upon the number of user inputs int[] array = new int[n]; //insert user input elements into the array for(int i = 0; i < n; i++) ...

Count how many numbers are negative in an array? Approach: Assume array of integer arr = [5,-9,66,-8,37] As we know a negative number is a real number less than zero We are going to apply the same logic here , and check the number of negative numbers in the array. Expected output is : 2 ,since there are 2 negative numbers among the set of numbers Implementing in Java /* Read input from STDIN. Print your output to STDOUT*/ import java.io.*; import java.util.*; public class CountNegativeNumbers{ public static void main(String args[] ) throws Exception { //Write code here Scanner scan = new Scanner(System.in); int n = scan.nextInt(); // takes user input int a[] = new int[n]; // creates array depending on the user input int count=0; //count variable which is zero initially for(...

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