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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.

Correct Answer :

D. An interface that defines methods to read primitive data types.


Related Questions

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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

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

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

A string object can not be modified after it is created.

A. True

B. False

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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

Declarations can appear anywhere in the body of a Java method.

A. True

B. False

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4

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

A. //#

B. /*

C. /**

D. //**

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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

A constructor must always invoke its supper class constructor in its first statement.

A. True

B. False

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4

A Java monitor must either extend thread class or implement Runnable interface.

A. True

B. False

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4

It is perfectly legal to refer to any instance variable inside of a static method.

A. True

B. False

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4

The break statement is required in the default case of a switch selection structure.

A. True

B. False

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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

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

Which of the following will produce a value of 22 if x=22.9:

A. Ceil(x)

B. Round(x)

C. Rint(x)

D. Abs(x)

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4

We can add more than one class(es) at the time of compilation Java Beans.

A. True.

B. False.

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4

The expression (x == y && a<b) is true If either x == y is true or a<b is true.

A. True

B. False

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4

An EJB is a server-side component that encapsulates the business logic of an application

A. True

B. False

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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

When we invoke repaint () for a Component, the AWT invokes the method:

A. draw()

B. update()

C. show()

D. paint()

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4

The check box group class is a subclass of the component class.

A. True

B. False

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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

executeUpdate automatically updates data because___________

A. auto commit is on, by default

B. It performs a hidden commit statement as well

C. Does not commit

D. None of the above.

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4

Which of the following command lines options generates documentation for all classes and methods?

A. -protected

B. -public

C. -private

D. -encoding

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4

Servlet can have ___________

A. get method and post method

B. get method or post method

C. Either 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

Give file is a file object, which of the following are legal statements to create a new file.

A. file.create();

B. FileOutputStream fos=new FileOutputStream(file);

C. FileInputStream fis=new FileInputStream(file);

D. all of the above

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4

When present, package must be the first no comment statement in the file.

A. True

B. False

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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 string can be used as mode string for creating a RandomAccessFile object?

A. "rw"

B. "wr"

C. "0"

D. 'w''