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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 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.

  (A), (C), (D) & (E)

  (A), (D) & (E)

  (A) & (D)

  (B), (D) & (E)

  (A), (B) & (D)

  Half-n-half Clue
 

2.

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

  show()

  draw()

  paint()

  update()

  Half-n-half Clue
 

3.

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

  move()

  remove()

  hide()

  disappear()

  delete()

  Half-n-half Clue
 

4.

Given 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) FileWrter out = new FileWriter(file);
(D) FileInputStream fis = new FileInputStream(file);
(E) RandomAccessFile raf = new RandomAccessFile(file);

  (B) & (C)

  (B), (D) & (E)

  (B), (C) & (E)

  (B), (C) & (D)

  (A), (B), (D) & (E)

  Half-n-half Clue
 

5.

Which are the valid ways to create DataInputStream streams?

  new DataInputStream();

  new DataInputStream(new File("in.dat"));

  new DataInputStream(new FileInputStream("in.dat");

  new DataInputStream("in.dat", "r");

  new DataInputStream("in.dat")

  Half-n-half Clue
 

6.

Which of the following strings can be used as mode strings for creating a RandomAccessFile object?
(A) "r"
(B) "w"
(C) "rw"
(D) "wr"
(E) "0"

  (A) & (C)

  (C) & (D)

  (A), (B), (C) & (E)

  (A), (B) & (C)

  (B), (D) & (E)

  Half-n-half Clue
 

7.

Which of the following applet tags is legal to embed an applet class named Test into a Web page?

  < applet
code = Test.class width = 200 height = 100>

  < applet
class = Test width = 200 height = 100>

  < applet>
code = Test.class width = 200 height = 100>

  < applet
param = Test.class width = 200 height = 100>

  < applet
code = Test.class width = 200 height = 100

  Half-n-half Clue
 


 
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