MCQ of Java With Answer set-7


1. The .................. and .................... classes are abstract classes that support reading and writing of byte streams.
A) reader, writer
B) inputstream, outputstream
C) objectinputstream, objectoutputstream
D) none

2. What is the error in the following code?
     class Test
     {
         abstract void display( );
     }

A) No error
B) Method display( ) should be declared as static
C) Test class should be declared as abstract
D) Test class should be declared as public

3. A package is a collection of
A) classes
B) interfaces
C) editing tools
D) classes and interfaces

4. Which of the following methods belong to the string class?
A) length( )
B) compare To ( )
C) equals ( )
D) All of them

5. What will be the output of the following code?
    byte x=64, y;
    y= (byte) (x<<2);
    System.out.println(y);

A) 0
B) 1
C) 2
D) 64

6. If m and n are int type variables, what will be the result of the expression
    m%n
    when m=5 and n=2 ?
A) 0
B) 1
C) 2
D) None of the above

7. Which of the following control expressions are valid for an if statement?
A) An integer expression
B) A Boolean expression
C) Either A or B
D) Neither A nor B

8. The concept of multiple inheritance is implemented in Java by
A) extending two or more classes
B) extending one class and implementing one or more interfaces
C) implementing two or more interfaces
D) both B and C

9. Which of the following do not represent legal flow control statements?
A) break;
B) return;
C) exit();
D) continue outer;

10. Data input is
A) an abstract class defined in java.io
B) a class we can use to read primitive data types
C) an interface that defines methods to open files.
D) an interface that defines methods to read primitive data types.

Answers:

1.  B) inputstream, outputstream
2.  C) Test class should be declared as abstract
3.  D) classes and interfaces
4.  D) All of them 
5.  A) 0
6.  B) 1
7.  B) A Boolean expression
8.  D) both B and C
9.  C) exit();
10.D) an interface that defines methods to read primitive data types.


You Might also view the following Related Posts

You can view the following other posts

For other more Multiple Choice Questions (MCQs): Click Here

Popular posts from this blog

MCQ of Structured Query Language(SQL) With Answer Set -2

1. Which of the following query is correct for using comparison operators in SQL ? A) SELECT sname, coursename FROM studentinfo WHERE age>50 and <80; B) SELECT sname, coursename FROM studentinfo WHERE age>50 and age <80; C) SELECT sname, coursename FROM studentinfo WHERE age>50 and WHERE age<80; D) None of the above 2.How to select all data from studentinfo table starting the name from letter 'r'? A) SELECT * FROM studentinfo WHERE sname LIKE 'r%'; B) SELECT * FROM studentinfo WHERE sname LIKE '%r%'; C) SELECT * FROM studentinfo WHERE sname LIKE '%r'; D) SELECT * FROM studentinfo WHERE sname LIKE '_r%'; 3. Which of the following SQL query is correct for selecting the name of staffs from 'tblstaff' table where salary is 15,000 or 25,000? A) SELECT sname from tblstaff WHERE salary IN (15000, 25000); B) SELECT sname from tblstaff WHERE salary BETWEEN 15000 AND 25000; C) Both A and B D) None of the above 4. The SELECT ...
Read more

Easy Methods to Increase Your Website Speed

Website speed is the most important factor for SEO. It also affects the popularity of your site, about every 25% of the visitors of the site left that even if it is useful for them for slow loading sites. Google also decided to include website loading speed for website ranking.  You can increase your website by performing testing or analyzing your site by using different such tools and performing the actions suggested by them. The main tasks to be performed to achieve such goals are setting an expiry date or maximum age in the HTTP headers, minimizing the HTTP redirects, minimizing the amount of JavaScript need while loading the page, minimizing unnecessary JavaScript, CSS Scripts and HTML, Optimizing images and long running scripts etc.  Why Website Speed is Most Important For SEO?  Only the fast loading websites can achieve better user experience and can have the minimum exit ratio. They can only achieve their goals in their online business and marketing. Search engine ...
Read more

Solved MCQ of SQL Server Set-2

1. ......................... are predefined and maintained SQL Server and users cannot assign or directly change the values. A) Global variables B) Local Variables C) Integer Variables D) Floating Variables 2. A local variable is shown ........................... preceding its name. A) One @ symbol B) Two @@ symbol C) One # symbol D) Two ## symbol 3. Constraint checking can be disabled on existing ........... and ............. constraints so that any data you modify or add to the table is not checked against the constraint. A) CHECK, FOREIGN KEY B) DELETE, FOREIGN KEY C) CHECK, PRIMARY KEY D) PRIMARY KEY, FOREIGN KEY 4. ................ and ................... are the Transact - SQL control-of-flow key words. A) Continue, Stop B) Break, Stop C) Continue, While D) While, Going to 5. The type of constraint ........................ specifies data values that are acceptable in a column. A) DEFAULT B) CHECK C) PRIMARY D) UNIQUE 6. The ..................... constraint defines a column or com...
Read more