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Java Programming : java.awt and java.io : Multiple Choice


Learn about java.awt and java.io packages.

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Multiple choice

Your Performance  

1.

Which of the following methods can be used to remove a java.awt.Component object from the display?

  remove()

  disappear()

  move()

  hide()

  delete()

  Half-n-half Clue
 

2.

DataInput is

  an abstract class defined in java.io.

  an interface that defines methods to read primitive data types.

  a class we can use to read primitive data types.

  an interface that defines methods to open files.

  Half-n-half Clue
 

3.

When we invoke repaint() for a java.awt.Component object, the AWT invokes the method:

  paint()

  show()

  draw()

  update()

  Half-n-half Clue
 

4.

Which of the following statements are true?
(A) Unicode characters are all 16 bits.
(B) UTF characters are all 24 bits.
(C) Reader class has methods that can read integers and floats.
(D) File class may be used to rename a file.
(E) DataOutputStream objects are used to write primitive data to a file.

  (B), (D) & (E)

  (A) & (D)

  (A), (B) & (D)

  (A), (D) & (E)

  (A), (C), (D) & (E)

  Half-n-half Clue
 

5.

What does the following line of code do?
Textfield text = new Textfield(10);

  Creates text object that can hold 10 rows of text.

  Creates text object that can hold 10 columns of text.

  Creates the object text and initializes it with the value 10.

  The code is illegal.

  Half-n-half Clue
 

6.

Which of the following methods can be used to change the size of a java.awt.Component object?
(A) dimension()
(B) setSize()
(C) area()
(D) size()
(E) resize()

  (B) & (E)

  (B), (D) & (E)

  (D) & (E)

  (A), (B) & (E)

  (A), (B), (C) & (E)

  Half-n-half Clue
 

7.

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

  Exception

  None of these

  IOException

  FileNotFoundException

  ReadException

  Half-n-half Clue
 


 
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