Modify variable with operations

One of the most important functionality of programming is to do calculations. And that is why computers are called computers. In order to do calculations, we need operators.

Here is the sample code:

Integer i = 10;

i *= 2; //Means i = i * 2, i is 20 now

i++; //Means i = i + 1, i is 21 now

Boolean b = i > 15; // b is true

Boolean b2 = i <= 20; //b2 is false

Boolean b3 = b && b2; // && means And, b3 is false

Boolean b4 = b || b2; // || means Or, b4 is true

String str = 'Hello ' + 'World'; //str is Hello World

Sometimes people from non-technical background may find it hard to understand statements like i = i + 1. Please note, this is not a mathematical equation. It is a statement in programming. This statement simply means get the value of i, add it by 1, then store the new value back to i.

i *= 2 is the abbreviation for i = i * 2. Similarly we can write i += 20 and i /= 2.

i++ is the abbreviation for i = i + 1; Similarly we can write i–, ++i and –1. But there is no i** or i // .

&& and || are logical operators, means And and Or.

+ in String operations means joining two strings together. Please note only + works for string. There is no -, * or / for String operation.

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Guys Convert your data type before doing calculation ..

Here is the Code :

Integer i = 12;
Decimal d = i / 5;
According to you what should be the right answer 2.4? Nopes current answer is 2.

Let me explain to you..

Decimal is a real number, so it can definitely hold 2.4. But the problem is, i is an integer, and 5 is an integer. So Apex will consider the type of i / 5 to be an integer because of that!
So the above code can be translated as:
Integer i = 12;
Integer temp = i / 5;
Decimal d = temp;
Now, make sense?
Okay, what if we want to fix it? We should do the data conversion first, and the calculation later. Below is the code.
Integer i = 12;
Decimal decVersion = i;
Decimal d = decVersion / 5; System.debug(d); 
This will output 2.4   
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Here are some best practices that we need to be followed while writing test classes in Salesforce:

  1. All test methods should reside in a separate class from the class in which the method being tested resides.
  2. These classes should be perfixed with the word Test the name of the class being tested, e.g. TestReferenceUseRequest.
  3. These classes should all use the @isTest annotation.
  4. There should be a minimum of “Null Pointer Exception test” as part of negative testing for each method, specially the methods that accept parameters.
  5. A method without an assert statement is not considered a test method. Large number of relevant assert statements increases confidence in the correct behaviour of business logic.
  6. There should be a comment with each assert statement explaining what is being tested and what the expected output is.
  7. Only use isTest(SeeAllData = true) on class methods in exceptional cases where there are sObjects that doesn't allow DML operation e.g. PriceBook creation.
  8. No hard coded ids of any sObject in any test method.
  9. If a Constant needs to be asserted ,its a best practice to reference that from the Constant class or from Custom Labels or Custom Settings. Using hard coded string in unit tests( or any class for that matter) will trigger failures when things like Picklist values change.
  10. All test data creation should be done from a Utility class. This allows for a streamlined creation of test objects that adhere to all the validation rules.
  11. Creating multiple test method for testing that same production code method should be avoided. We want to ensure that our unit test methods are properly testing the logic but the same time the efficiency of the unit test method should not be ignored. All the unit test methods run with every deployment so the cumulative run time should be as small as possible.
  12. All private methods should also have its corresponding unit test method. In the production code, add a public method for each private method.
  13. Any asynchronous method testing should include Test.startTest and Test.stopTest. Test.stopTest forces the asynchronous methods to run so the results could be asserted.
  14. Any exceptions that are caught in the production methods should be tested by feeding the test data that throws exception. Exception Type and error message should be asserted.
  15. Every class should have test coverage close to 95% as possible. The focus should be on asserting method behaviour rather than increasing coverage. There are very few instances where a method behaviour is not straightforward to reproduce and hence test. These should be properly commented.
  16. Avoid Try/Catch blocks in test methods.
  17. Any business logic that needs to be tested should be enveloped within a Test.runAs(user) statement so profile restrictions can be tested. . Using any admin profiles should be avoided.
    For Example:A new test user is created, then code is run as that user, with that user's record sharing access:
    private class TestRunAs {
      public static testMethod void testRunAs() {
         // Setup test data
        // This code runs as the system user
         Profile p = [SELECT Id FROM Profile WHERE Name='Standard User'];
         User u = new User(Alias = 'standt', Email='',
         EmailEncodingKey='UTF-8', LastName='Testing', LanguageLocaleKey='en_US',
         LocaleSidKey='en_US', ProfileId = p.Id,
         TimeZoneSidKey='America/Los_Angeles', UserName='');

         System.runAs(u) {
            // The following code runs as user 'u'
            System.debug('Current User: ' + UserInfo.getUserName());
            System.debug('Current Profile: ' + UserInfo.getProfileId());

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How to Fetch Gmail contact List From your gmail account

Hi Friends,

             Here I am posting  a code to fetch or get gmail contact in our application. For this we need to include some gmail APIs which required while in importing the contact list.
Before code we have to download APIs from HERE .After clicking on this you will get a page like this:

You should include following name spaces
using Google.GData.Client;
using Google.Contacts;
using Google.GData.Extensions;
using System.Collections.Generic;

Then you can use this method...

private List<string> GetContactList(string email, string pwd)

        List<string> lstContacts = new List<string>();

        // Here required your gmail id and password.
        RequestSettings rsLoginInfo = new RequestSettings("", email, pwd);
        rsLoginInfo.AutoPaging = true;
        ContactsRequest cRequest = new ContactsRequest(rsLoginInfo);

        // get contacts list
        Feed<Contact> feedContacts = cRequest.GetContacts();

        // looping the feedcontact entries
        foreach (Contact gmailAddresses in feedContacts.Entries)
            // Looping to read  email addresses
            foreach (EMail emailId in gmailAddresses.Emails)
        return lstContacts;      

Hope this will help you ...
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