Salesforce Apex Interview Questions and Answers

21. In Which object all Apex Pages are stored?
Answer: ApexPage

22. What are the uses of the tag?
Answer: A component that provides support for invoking controller action methods directly from JavaScript code using an AJAX request. A component must be a child of a component. Because binding between the caller and is done based on parameter order, ensure that the order is matched by the caller’s argument list.

Unlike, which only provides support for invoking controller action methods from other Visualforce components, defines a new JavaScript function which can then be called from within a block of JavaScript code.

Note: Beginning with API version 23 you can’t place inside an iteration component and so on. Put them after the iteration component, and inside the iteration put a normal JavaScript function that calls it.

This tag supports the following attributes:

Action: The action method invoked when the action function is called by a JavaScript event elsewhere in the page markup. Use merge-field syntax to reference the method. For example, action=”{!save}” references the save method in the controller. If an action is not specified, the page simply refreshes.

Focus: The ID of the component that is in focus after the AJAX request completes.

Id: An identifier that allows the action function component to be referenced by other components in the page.

Immediate: A Boolean value that specifies whether the action associated with this component should happen immediately, without processing any validation rules associated with the fields on the page. If set to true, the action happens immediately and validation rules are skipped. If not specified, this value defaults to false.

Name: The name of the JavaScript function that, when invoked elsewhere in the page markup, causes the method specified by the action attribute to execute. When the action method completes, the components specified by the reRender attribute are refreshed.

Onbeforedomupdate: The JavaScript invoked when the onbeforedomupdate event occurs–that is when the AJAX request has been processed, but before the browser’s DOM is updated.

incomplete: The JavaScript invoked when the result of an AJAX update request completes on the client.

Rendered: A Boolean value that specifies whether the component is rendered on the page. If not specified, this value defaults to true.

ReRender: The ID of one or more components that are redrawn when the result of the action method returns to the client. This value can be a single ID, a comma-separated list of IDs, or a merge field expression for a list or collection of IDs.

Status: The ID of an associated component that displays the status of an AJAX update request. See the action status component.

timeout: The amount of time (in milliseconds) before an AJAX update request should time out.

23. What is creating a debug log for users?
Answer: Track code.

24. What are Workarounds for Missing Apex Time?format() Instance Method?
Answer: You could just split the DateTime format() result on the first space – does that give you what you’re looking for?

public String myDateFormat(DateTime dt) {

String[] parts = dt.format().split(‘ ‘);

return (parts.size() == 3) ? (parts[1] + ‘ ‘ + parts[2]) : parts[1];

produces

6:38 PM

for me in English (United States), and

18:42

in French(France).

UPDATE: As to logic points out, the above method is not very robust – some locales may include spaces in the date or time portion of the format, and the ordering is not consistent. This second attempt assumes that the date and time are separated by zero or more spaces, but handles spaces within the two portions, and either ordering of date and time. The only assumption made is that the formatted Date is contained within the formatted Time:

public String my date format(DateTime dt) {

return dt.format().replace(dt.date().format(), ”).trim();

It seems to work fine for Hebrew, Vietnamese & Korean, as well as English and French.

25. How cases are created?
Answer: Email to Case and Web to Case 

26. What is the difference between With Sharing and Without Sharing?
Answer: For example, if a method is defined in a class declared with sharing is called by a class declared without sharing, the method will execute with sharing rules enforced. … For example, if the class is called by another class that has sharing enforced, then sharing is enforced for the called class. 

27. What is after undelete?
Answer: While retrieving from the recycling bin

28. In which object all Approval process are stored?
Answer: Approval

29. Is there an average method for apex math? 
Answer: Unfortunately the standard math methods only include simpler operations (i.e. those that work on a single, or two values), so it looks as though you’ll have to roll your own method.

Of course, the number of script statements executed will be proportional to the length of the list, so of the lists are ever of a fixed size it could be worth using a macro to generate the addition part for you:

Int sum = i[0] + i[1] + … i[n];

Doing so would only count for one statement, but you’ll only need this if governor limits are of concern which is often not a worry.

If governor limits aren’t an issue you could create a function along these lines:

Skip code block

Integer[] myInts = new Integer[]{1, 2, 3, 4, 5, 6, 7};

Integer total = 0;

Double Avg;

for (Integer i : myInts) {

total += i;

Avg = Double.valueOf(total) / myInts.size();

return Avg;

30. Will Trigger.new supports —>Insert, Will Trigger.Delete supports —>Delete?
Answer: Yes.