Question 1

Which interface provides the capability to store objects using a key-value pair ?

Accepted Answer

java.util.Map

Answer

java.util.Set

Answer

java.util.List

Answer

java.util.Collection

Question 2

Which of the following statement is false about HashMap class ?

Accepted Answer

HashMap maintains order of its element.

Answer

HashMap has key value pair type of storage.

Answer

HashMap uses a hashtable to store the map.

Answer

HashMap class is not synchronized.

Question 3

What is Collection in Java?

Accepted Answer

a group of objects

Answer

none of these

Answer

a group of interfaces

Answer

a group of classes

Question 4

Which of these is method for testing whether the specified element is a file or a directory?

Accepted Answer

isFile()

Answer

Isfile()

Answer

isfile()

Answer

IsFile()

Question 5

What does this code return ?

try{
      File f = new File("a.txt");
}catch(Exception e){
}catch(IOException io){
}

Accepted Answer

compilation error

Answer

none of these

Answer

false

Answer

true

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