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4

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

A. True

B. False

Correct Answer :

A. True


Related Questions

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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

To delete a file, we can use an instance of class file.

A. True

B. False

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4

Which of the following methods can be used to remove a component from the display?

A. remove()

B. desappear()

C. hide()

D. move()

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4

Every call to wait has a corresponding call to notify that will eventually end the wafting.

A. True

B. False

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4

Which of the following are the wrapper classes?

A. Random

B. Vector

C. Byte

D. all of the above

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4

The use of protected keyword to a member in a class will restrict its visibility as follows:

A. Visibility only in the class and its subclasses in the same package.

B. Visibility only inside the same package.

C. Visibility in all classes in the same package and subclasses in other packages.

D. Visibility only in the class where it is declared.

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4

A JSP file can be stored_________________

A. With the extension .jsp in servlets folder of the jws

B. With the extension .html in public_html folder of the jws

C. With the extension .jsp in public_html folder of the jws

D. None of the above.

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4

Which of the following methods can be used to draw the outline of a square?

A. fillRect()

B. drawLine()

C. drawString()

D. all of the above

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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

class.forName(...) creates an instance of java ODBC driver

A. True

B. False

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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

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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

What is wrong in the following class definitions? 
abstract class print { 
abstract show();
}
class Display extends print {
}

A. Nothing is wrong

B. Wrong Method show() should have a return type

C. Wrong Methods show() is not implemented in Display

D. Wrong Display does not contain any members.

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4

With javadoc, which of the following denotes a javadoc comment?

A. //#

B. /*

C. /**

D. //**

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4

When the string objects are compared with ==, the result is true If the strings contain the same values.

A. True

B. False

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4

A package is a collection of

A. classes

B. interface

C. editing tools

D. classes and interfaces

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4

It is an error if a class with one or more abstract methods is not explicitly declared abstract.

A. True

B. False

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4

In order to connect to a database through java program we must create _______-

A. Connection, Statement, ResultSet

B. Connection, ResultSet

C. Statement< ResultSet

D. Connection, Statement

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4

Every method of a final in class is implicitly final.

A. True

B. False

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4

Which of the following are not keywords?

A. NULL

B. Implements

C. Protected

D. None of the above

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4

It is an error to catch the same type of exception in two different catch blocks associated with a particular try block.

A. True

B. False

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4

Which javadoc tag is used to denote a comment for methods parameters?

A. @method

B. @parameter

C. @argument

D. @param

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4

Which of the following methods can be used to change the size of a
size() *
resize()

A. component

B. dimension()

C. setSize()

D. size()

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4

A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.

A. True

B. False

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4

In a single Servlet class we can use____________

A. doGet(...) method only

B. doPost(...) method only

C. doGet(...) method and doPost(...) method both at a time.

D. Either 'a' or 'b'

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4

The length of a string object 's1' can be obtained using the expression s1.length.

A. True

B. False

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4

EJBs can be of the following type(s)
None of the above

A. Entity Bean

B. Session Bean

C. Message-driven bean

D. All of the above

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4

A class may be both abstract and final.

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

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

A. Synchronized

B. Boolean

C. union

D. goto