Basics

Question 1

Important scanner

Answer 1

Import java.util.Scanner;

Scanner inputData = new Scanner(System.in)

Question 2

Syntax—>Math random
-50 to 50
0-10

Answer 2

(int) (Math.random() * 101-50)

(int) (Math.random() * 11

Question 3

String to primitive

integer

Answer 3

String num1 = “22”;

int int1 = Integer.parseInt(num1);

Question 4

String to primitive

Wrapper class

Answer 4

String n1 = “22”;

Integer int1 = Integer.valueOf(n1);

Question 5

(++, –)

Answer 5

Increment and decrement operators

Question 6

(+, -, *, /, %)

Answer 6

Arithmetic operators

Question 7

(, <=, >=, ==, !=)

Answer 7

Comparison (Relational) operators

Question 8

(&&, ||, !)

Answer 8

Logical operators

Question 9

( =, += , -=, *=, /=, %=)

Answer 9

Assignment operators

Question 10

Implicit casting

Answer 10

converting a smaller data type to a larger data type size. Performed
automatically by the compiler

byte number1 = 45;
int number2 = number1

Question 11

Explicit casting

Answer 11

converting a larger data type to a smaller data type size and performed manually
by users

double d1 = 100.0;
float f1 = (float)d1;

Question 12

What are if-else statements in Java and what are they are used for?

Answer 12

• Java if-else statements are used to test specific conditions and they control the flow of the program based on the condition.
• It will execute a block of code if given condition is true, and another code of block if condition is false

Question 13

What is break statement in Java?

Answer 13

break is used for termination in Java

It is used with switch statements and loops

Question 14

What are wrapper classes in Java?

Answer 14

• Wrapper classes are object representations of primitives
• There is a wrapper class for each primitive type
• Wrapper class names are usually same as with primitive data types

Question 15

Explain main() method in java?

Answer 15

• It is one of the most important methods in java as it tells java where the programs start
• We cannot run our programs without main method and all our programs should be in main() method
• JVM always look for this method to start running an application

Question 16

What is java and javac

Answer 16

• javac stands for java compiler and it is used to compile source code
• java is used to run the compiled code by javac

Question 17

JIT
JVM
JRE
JDK
Architecture

Answer 17

JDK = development tools + JRE + JVM
JRE = all the java libraries + java classes + JVM
JVM = Java Virtual Machine and it holds JIT as well

Question 18

JIT

Answer 18

Just in Time Compiler and it stands inside the JVM.

Question 19

JVM

Answer 19

Java Virtual Machine and used to run the programs.

JVM itself is platform dependent

Question 20

JRE

Answer 20

Java Runtime Environment

It holds all the Java libraries and java classes. It has JVM inside

Question 21

JDK

Answer 21

Java Development Kit and is used to create Java programs

Question 22

What is Agile?

Answer 22

Agile is INCREMENTAL and ITERATIVE approach to manage the project.

Question 23

What is SCRUM?

Answer 23

• Scrum is an agile process that allows us to focus on delivering the highest business value in the shortest amount of time

Question 24

What is ‘User Story’?

Answer 24

A user story is an informal, general explanation of a software feature written from the perspective of the end-user or customer.

As a user…

Question 25

What is Sprint?

Answer 25

A sprint is a short, time-boxed period when a scrum team completes a set amount of work.

Question 26

What are the Scrum Ceremonies?

Answer 26

1. Daily Scrum Meeting 2. Sprint Planning Meeting 3. Sprint Review Meeting 4. Sprint Retrospective Meeting

Question 27

What is the Sprint Backlog Grooming Meeting

Answer 27

* This meeting is performed in the middle of each sprint to refine the user stories for the next sprint * Product Owner, Scrum Master, and Development team attend this meeting * Prioritize user stories * Add details to the user stories * Estimate the time to deliver the user stories

Question 28

Agile

Answer 28

Incremental and iterative approach to manage the project. It is flexible and you can go back and forth between phases.

Question 29

Waterfall

Answer 29

Linear and sequential approach to manage the project. It is strict you cannot go back to the previous phase.

Question 30

Scrum

Answer 30

Scrum is an agile process that allows us to focus on delivering the highest business value in the shortest time

Question 31

QA

Answer 31

We are verifying the documentation | and validating the application.

Question 32

The Topics in the Retro Meeting

Answer 32

What went wrong? What went well?

Question 33

What is an object

Answer 33

An object is used to store data. An instance of a Class

Question 34

if(what goes here){ }

Answer 34

Statements

Question 35

What are the Scrum Values?

Answer 35

* Commitment * Courage * Focus * Openness * Respect