Java-Collections

Which of the following statements about arrays is true?

• Arrays can be resized after declaration.
• Arrays can hold both homogeneous and heterogeneous data elements.
• Arrays can hold only homogeneous data type elements.
• Arrays are implemented based on some standard data structure.

Which of the following is a limitation of arrays?

• They are growable in nature.
• They can hold only objects but not primitives.
• They are fixed in size.
• They are based on some standard data structure.

What is the main advantage of arrays?

• They can hold heterogeneous data elements.
• They are implemented based on some data structure.
• They can represent a huge number of elements using a single variable.
• They have ready-made method support.

Which of the following can hold both primitives and object types?

• Arrays
• Collections
• Both Arrays and Collections
• Neither Arrays nor Collections

Which of the following is a characteristic of Collections?

• They are fixed in size.
• They are implemented based on some standard data structure.
• They can hold only homogeneous data type elements.
• They are recommended for performance point of view.

If you need to represent a group of objects as a single entity, which concept should you opt for?

• Arrays
• Collection
• Primitives
• Data structures

Which programming language uses STL (Standard Template Library) for its collection framework?

• Java
• Python
• C++
• C#

Which of the following is NOT one of the nine key interfaces of the collection framework?

• List
• Array
• Queue
• Map

What kind of data can collections hold?

• Only primitives
• Only objects
• Both primitives and objects
• Neither primitives nor objects

From the performance point of view, which of the following is recommended to use?

• Arrays
• Collections
• Both Arrays and Collections
• Neither Arrays nor Collections