testquiz

What will be the output of the following code?

int[] arr = {2, 4, 6, 8};

System.out.println(arr[arr.length - 2]);

• 2
  

• 6

• 8

• 4

Which component would best be used for multiline text input in Swing?

• JTextField

• JTextArea

• JPasswordField

• JLabel

What is true about 2D arrays?

• All rows must be the same length

• You can't use indexes with them

• They can only be declared dynamically

• They can be jagged

What does the following recursive function return?

int func(int n) {

if (n <= 0) return 1;

return n * func(n - 1); }

System.out.println(func(3));

• 3

• 9

• 6

• 1

In exception handling, finally block:

• Executes only if an exception occurs

• Never executes

• Always executes

• Executes after catch only

Which of the following can be used to catch an exception?

• try-catch

• catch-finally

• try-finally

• throw-catch

Which method is used to write text to a file?

• File.read()

• File.write()

• write() of FileWriter

• Scanner.next()

Which class is used to read from a file line-by-line?

• File

• Scanner

• BufferedReader

• FileWriter

Which of these is true about recursion?

• All recursion must end with an exception

• Every recursive method must have a base case

• Recursion is always faster than iteration

• Java does not support recursion

If no catch matches the exception, then:

• JVM throws it further

• It’s ignored

• Program continues

• JVM exits silently