Apex Non Developers Flashcards by Che Ese

Attributes

Which describe properties (nouns or adjectives). They are characteristics of the class

access modifier, data type, unique name
public String name;
public String height;

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Methods

Which describe behavior (verbs)

Actions performed by a class

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Methods of the human class

Walk, Talk, work

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Attributes of the human class

Toes, Fingers, Hands, Name

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Instantiation

Creating an object from a class

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Instantiation requires?

class name,
object name,
new keyword,
class name with parentheses

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Method declaration syntax includes

An access modifier,
a data type or void, 
a unique method name, 
a pair of parentheses, 
a code block with curly braces

public void walk(){
}

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Attribute declaration syntax includes

An access modifier, a data type, a unique name

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A Method can either return?

1) Void or
2) A single data type: which could be a collection
- -Use the return keyword to pass back a value

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Primitives

basic building blocks and cannot be broken down

String firstname = ‘Adam’;

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Composites

Non-primitive data types that are built from other data types. Often see the keyword new.

Human man1 = new Human();
Human woman1 - new Human();

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A Method can either return?

Void or
A single data type: which could be a collection
–Use the return keyword to pass back a value

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When you see a composite being declared what do you usually see?

the keyword new

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How do you pass in parameters to a method

You can pass attributes as parameters into a method inside of the ()
The method declaration must supply:
1)a data type that indicates what type of data the method should expect
2)a local variable name that will accept the incoming data

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Instantiate an object from the BankAcct class called chkAcct

chkAcct BankAcct = new chkAcct();

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Set the attribute accttype of the object chkAcct to Checking

chkAcct.accttype = ‘Checking’;

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Set the attribute acctName of the object chkAcct to D.Castillo-Chk

chkAcct.acctName = ‘D.Castillo-Chk’

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Invoke the makeDeposit method for $150

chkAcct.makeDeposit(150);

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What is a list?

An ordered collection of data of one data type distinguished by its index

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Each element in a list contains what 2 pieces of information

An index: an integer that always starts at 0

A value: The data

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Whenever you’re looking at a parentheses you’re looking at

A Method

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Declare a method that does not return anything and takes one input parameter of a Candidate list object called candsFromTrigger

public void createContact (List candsFromTrigger){

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What does the List for loop do?

It iterates over all of the elements in a list one by one with the help of an iteration variable

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What is an sObject?

standard or custom objects that store record data in the force.com database

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How do developers refer to sObjects and fields

By API names

An sObject variable represents

a row of data and can only be declared in Apex using the SOAP API name of the object

Instantiate an sObject

Account a = new Account();

DML Operations

``` saving changes to records in the database Insert Update Upsert Delete ```

DML can operate on?

A single sObject or a list of sObject

Database.insert

Database is the class. .insert is the method

Instantiate an object called acct from the sObject Account class

Account acct = new Account();

Set the attribute name of the acct object to Recruiting

acct.name='Recruiting';

Instantiate an object called heese from the sObject Account class

Account heese = new Account();

SOQL

Salesforce Object Query Language

What is the difference between SOQL and SQL

It's querying sObjects which is an abstraction layer away from the Database

What can SOQL expressions return

A single record A list of records An Integer, when using an aggregate function across records

What is a trigger

an apex script that executes before or after a DML operation on a single sObject

What do triggers have that determine when the trigger will execute

Before and After events

What is Trigger.new and Trigger.old

Attributes that provide access to the old and new versions of the sObject records. Trigger is a class.

Triggers execute when

Records are saved through the UI or Web Services API

Instantiate an object called cc from the class CreateContactFromCan

CreateContactFromCan cc = new CreateContactFromCan();

Declare a method that does not return anything called createContact

public void createContact (){ | }

Instantiate an object from the BankAcct class called chkAcct

BankAcct chkAcct = new BankAcct();

Set the attribute accttype of the object chkAcct to Checking

chkAcct.accttype = 'Checking';

Instantiate an object from the BankAcct class called savAcct

BankAcct savAcct = new BankAcct();

Instantiate an BankAcct List object from the List class called bankAccts

List bankAccts = new List();

Add the chkAcct object to the bankAccts list

bankAccts.add(chkAcct);

Instantiate a Contact list object from the List class

List conList = new List();

Declare a For List loop to loop through the list bankAccts with an iterationvariable called tempacct

For (BankAcct tempacct:bankAccts){

Declare a For list loop to loop through the input parameter list candsFromTrigger with an iterationvariable called currentCandidate

for(Candidate__c currentCandidate:candsFromTrigger){

Instantiate an object called acct from the sObject Account class

Account acct = new Account();

Set the attribute name of the acct object to Recruiting

acct.name='Recruiting';

Persist the acct object to the DB using DML

Database.insert(acct);

Instantiate an object called con from the sObject class contact

Contact con = new Contact()

Add the con object to the conList

conList.add(con);

Instantiate an object called cc from the class CreateContactFromCan

CreateContactFromCan cc = new CreateContactFromCan();

Declare a private integer attribute called balance initalize to zero

private integer balance=0;

Declare a method named makeDeposit that does not return anything and one input parameter of type integer called deposit

public void makeDeposit (integer deposit){

Declare a method named getBalance that returns an integer and no input parameter

public integer getBalance(){

What is system.debug

A special method that you can add to your code to generate output when your code is executed to provide feedback for the developer

Object Oriented Languages are based off

Classes

What is the abstract the intangible?

Class

Classes are where you define

Attributes and Methods

What are classes?

Blueprints used to create objects in Code. Start with a capital Letter

How are objects created from classes?

Insantiation. Human man1 = New Human() class name, object name, new keyword, class name with()

Attributes start with?

A lowercase letter

Primitive data type examples

``` Boolean Integer Date String ID Blob Enum ```

Where does Apex operate?

In memory, separate from the database

What persists data to the database?

DML

Object names starts with?

A lowercase letter

Where does Apex run

in Memory on the application server

A method always has what at the end?

Parens ()

Each element in a list always contains?

An index that always starts at zero and a value

List for loop syntax

``` for (iterationVariableDataType iterationVariable : list){ //code } ``` for(String currentname : studentList){ }

Whats another way of thinking about list for loops

For each element in my list loop

IterationVariableDataType is always what data type

The data type of your list

Whats the syntax for list for loops

for(type of List currentStudent :StudentList){ | }

Attributes are similar to

Fields

Instantiate an object is the equivalent of

Creating a new record in the UI

What map method do you use to get a set of all of the keys

keySet

What map method reruns a list of values in the map

values

Trigger.new

Trigger is a class. New is an attribute

An object is?

An Instance of a class

Trigger.new returns

a list of the new versions of sObjects

Trigger.old returns

a list of the old versions of sObjecfts