General Knowledge



what is difference between public static and void?

public − This is the access specifier the method can be accessed publically.

static − Here, the object is not required to access static members.

void − This states that the method doesn’t return any value.

what is inheritance?

inheritance can be defined as the process where one class acquires (অর্জন)the properties (methods and fields) of another. the class whose properties are inherited is known as superclass (base class, parent class).

what is constructor?

a constructor is a special type of subroutine called to create an object.


When a class or struct is created, its constructor is called. Constructors have the same name as the class or struct, and they usually initialize the data members of the new object. In the following example, a class named Taxi is defined by using a simple constructor.

what is difference between sql and plsql?

SQL is data oriented language. PL/SQL is application oriented language. SQL is used to write queries, create and execute DDL and DML statments. PL/SQL is used to write program blocks, functions, procedures, triggers and packages.

what is the difference between abstract class and variable?

A Java abstract class can have instance methods that implements a default behaviour. Variables declared in a Java interface are by default final. An abstract class may contain non-final variables. Members of a Java interface are public by default.

what is disadvantages database normalization?

Here are some of the disadvantages of normalization: Since data is not duplicated, table joins are required. This makes queries more complicated, and thus read times are slower. Since joins are required, indexing does not work as efficiently.

what is difference between primary key and unique key?

Primary Key is a column that is used to uniquely identify each tuple of the table. It is used to add integrity constraints to the table. Only one primary key is allowed to be used in a table. … Unique key is a constraint that is used to uniquely identify a tuple in a table.

What is the meaning of Mushak Form (VAT) (4.3,6.1,,6.3,6.5,6.6,6.7,6.8,6.10 and 9.1)

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