Apex Basics

What is APEX ?

• Apex is a strongly typed, object-oriented programming language

• Apex is a object-oriented programming language but not strongly typed language

• Apex is a Hyper Text Markup Language.

• Apex is a strongly typed, case insensitive and object-oriented programming language.

What is Variable?

• A variable is a named value holder in memory

• It is a datatype.

The name we choose for the variable is called ?

• Datatype

• Statement

• Instruction

• Identifier

A single variable can store how many values at the same time ?

• One

• Multiple

What will be the output of the following code.

boolean flag;

system.debug(flag);

• false

• true

• null

• error

Is the correct initialization of the variable below?

String name = 'John ' , 'Wick ';

• Yes

• No

What will happen If you run the following code ?

Integer age = 15;

INTEGER AGE = 20;

system.debug(Age);

• 20 will be print

• 15 will be print

• error

• nothing

How to apply single line comment in Apex ?

• /

• //

• /*

• ?/

Which one is the correct way to apply multi lines comment in Apex?

• /*

  String firstName;

  String lastName

  */

• */

  String firstName;

  String lastName

  /*

• //

  String firstName;

  String lastName

  //

• /*

  String firstName;

  String lastName

  ?/

Which are the primitive data types from the following?

• Integer, Double, Long, Date, Datetime, String, Id, and Boolean

• List, Set and Map

• account, contact, custom_object__c etc

• Classes, Objects and Interface