Interview Questions

Q:

If super class ref is pointing sub class object then by using super class ref is it possible to call sub class newly defined method?

Answer

yes if the method is ovreriding method


no if the method is not overriding method

Report Error

View answer Workspace Report Error Discuss

Subject: Java

143 2360
Q:

How can you prevent a class from overriding in C# and Visual Basic?

Answer

You can prevent a class from overriding in C# by using the sealed keyword; whereas, the NotInheritable keyword is used to prevent a class from overriding in Visual Basic.

Report Error

View answer Workspace Report Error Discuss

Subject: .NET

0 2357
Q:

How does an application run in isolation from other applications?

Answer

Each application gets its own Linux user ID and virtual machine which means that the application code runs in isolation from other applications.

Report Error

View answer Workspace Report Error Discuss

0 2356
Q:

What is a synonym? What are its various types?

Answer

A synonym can be called as an alias for a table, view, sequence or program unit. It is basically of two types:
- Private - Only the owner can access it.
- Public - Can be accessed by any database user.

Report Error

View answer Workspace Report Error Discuss

Subject: Oracle

0 2356
Q:

What are layer objects and what do they represent?

Answer

Layer objects are data objects which represent visual content. Layer objects are used by views to render their content. Custom layer objects can also be added to the interface to implement complex animations and other types of sophisticated visual effects.

Report Error

View answer Workspace Report Error Discuss

0 2354
Q:

Explain the difference between value types and reference types

Answer

Value type :


 



  • Stores the data

  • The value of value types is stored on the managed stack

  • They are lighter objects 

  • One variable can have only one value


Reference Type :



  • Stores the reference to the data

  • A reference type is allocated on the heap

  • They are heavier objects

  • Several variables can reference the same data


 

Report Error

View answer Workspace Report Error Discuss

Subject: .NET

0 2354
Q:

What are the uses of synonyms?

Answer

- Mask the real name and owner of an object.
- Provide public access to an object
- Provide location transparency for tables, views or program units of a remote database.
- Simplify the SQL statements for database users.

Report Error

View answer Workspace Report Error Discuss

Subject: Oracle

1 2349
Q:

How do you define a constant?

Answer Via define() directive, like define ("MYCONSTANT", 100);
Report Error

View answer Workspace Report Error Discuss

Subject: PHP

0 2349