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What is the correct answer?

4

Consider the following class definition.
Class Student extends String
{
}
What happens when we try to compile this class?

A. Will not compile because class body is not defined

B. Will not compile because class is not declared public

C. Will compile successfully.

D. Will not compile because String is abstract

Correct Answer :

D. Will not compile because String is abstract


Related Questions

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4

The name of a Java program file must match the name of the class with the extension Java.

A. True

B. False

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4

A variable declared inside the for loop control can not be referenced out side the loop.

A. True

B. False

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4

If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.

A. True

B. False

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4

If you want to assign a value of 99 to the variable year, then which of the following lines can be used within an <applet> tags?

A. number=getParameter(99)

B. <number==99>

C.

D. <param = radius value ==99>

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4

The programmer must explicitly create the system .in and system .out objects.

A. True

B. False

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4

Java is fully object oriented programme.

A. true

B. false

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4

Throwing an exception always causes program termination.

A. True

B. False

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4

In RMI before running the client program we must start RMI Registry.

A. True.

B. False.

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4

Which of the following represent legal flow control statements?

A. break;

B. break();

C. continue(inner);

D. all of the above

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4

The default case is always required in the switch selection structure.

A. True

B. False

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4

The setBackground() method is part of the class

A. Applet

B. Component

C. Container

D. Object

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4

The methods wait() and noify() are defined in

A. java.lang.Thread

B. java.lang.Runnable

C. java.lang.Object

D. java.lang.ThreadGroup

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4

Any method in a supper class can be over ridden in its subclass.

A. True

B. False

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4

A catch can have comma-separated multiple arguments.

A. True

B. False

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4

The keywords reserved but not used in the initial version of Java re:

A. Synchronized

B. Boolean

C. union

D. goto

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4

JdbcOdbcDriver is an object of Object class

A. True

B. False

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4

When we implement the Runnable interface, we must define the method

A. start()

B. init()

C. runnable()

D. run()

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4

Which exception is thrown by the read() method of InputStream class?

A. IOException

B. FileNotFoundException

C. ReadException

D. None of the above

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4

For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.

A. True.

B. False.

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4

If m and n are int type variables, what will be the result of the expression
'm % n' when m = -14 and n = -3?

A. 4

B. 2

C. -2

D. -4

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4

Objects are passed to a method by use of call-by-reference.

A. True

B. False

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4

Which of the following methods belong to the String class?

A. length()

B. compareTo()

C. substring()

D. all of the them

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4

Consider the following class definition.
Class Student extends String
{
}
What happens when we try to compile this class?

A. Will not compile because class body is not defined

B. Will not compile because class is not declared public

C. Will compile successfully.

D. Will not compile because String is abstract

What is the correct answer?

4

It is perfectly legal to assign a subclass object to a supper class reference.

A. True

B. False

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4

The import statement is always the first no comment statement in a Java program files.

A. True

B. False

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4

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. all the above

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4

Which of the following keywords are used to control access to a class member?

A. default

B. protected

C. interface

D. None of the above

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4

A final class may not have any abstract method.

A. True

B. False

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4

DataInput is

A. An abstract class defined is 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.

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4

Message-Driven beans act as a listener for the Java Message Service API, processing messages synchronously

A. True

B. False