APEX Class in Salesforce

Apex is a strongly typed Object - oriented programming language and it will run on Force.com platform.

Here we give you the info about how to create a class in salesforce

To create a class in salesforce go to Setup - > Build - > Develop - > Apex Class and click on NEW button and create class there.

Apex Class Structure

Below is the sample structure for Apex class definition.

Syntax

private | public | global[virtual | abstract | with sharing | without sharing]

class ClassName[implements InterfaceNameList][extends ClassName] {

    // Classs Body

}

Example Following is a sample structure for Apex class definition−

public class MySampleApexClass { //Class definition and body

    public static Integer myValue = 0; //Class Member variable

    public static String myString = ''; //Class Member variable   

    public static Integer getCalculatedValue() {

        // Method definition and body

        // do some calculation

        myValue = myValue + 10;

        return myValue;

    }

}

More Sample for Apex class: -

Example 1: -Class for Account Creation

Public Class AccountCreation {

    Public List < Account > CreateAccount(String s, String p) {

        List < Account > a = new List < Account > ();

        for (Account acc: a) {

            acc.Name = s;

            acc.phone = p;

            insert all;

        }

        return a;

    }

}

Go to Developer Console and execute the following code: AccountCreation ac = new AccountCreation();

Ac.CreateAccount(‘Osmania University’, 11112’);

Example 2 -   for Static Keyword

Public Class HelloWorld {

    Public static void Method1() {

        System.debug('TechnoEric Solutions');

    }

    Public void method2() {

        System.debug('Osmaina University');

    }

}

Go to the Developer Console and execute the following HelloWorld hw = new HelloWorld();

Hw.Method1(); // It gives Error. For static methods we cannot have instant for the class. HelloWorld.Method1();

Hw.Method2();

Example 3: -Retrieving Account Records by passing Single field value(Phone number): 

Public class FetchAccountNameFromPhone {

    Public Set < String > FetchAccName(String p) {

        Set < String > s1 = new Set < String > ();

        List < Account > acc = “Select id, Name From Account where phone”;

        for (Account a: acc) {

            String s = a.name;

            s1.add(s);

        }

        System.debug('xxxxxxxxx' + s1);

        return s1;

    }

}

Example 4: -Apex class for creating account, contact, opportunity ata a time

Public class Acc_Con_Opty_Creation {

    Public Account CreateAccount(String n) {

        Account a = new Account();

        a.Name = ’n’;

        insert a;

        Contact c = new Contact();

        c.LastName = 'Vikas Singh';

        c.AccountId = a.id;

        insert c;

        Opportunity opp = new Opportunity();

        opp.Name = 'Test Opportunity';

        Date d = Date.newinstance(‘2012, 2, 17’);

        opp.CloseDate = d;

        opp.StageName = 'Closed Lost';

        opp.Accountid = a.id;

        insert opp;

        return a;

    }

}

Go to the Developer Console and execute the following: Acc_Con_Opty_Creation acoc = new Acc_Con_Opty_Creation();

Acc.CreateAccount(‘capital info Solutions’);