Learn Java from Scratch - A Beginner's Guide - Step 03 - Java Arrays - Puzzles - Arrays of Objects, Primitive Data Types

This video explores puzzles related to arrays, including creating and accessing array values. It revisits a previous exercise on creating a marks array and discusses array initialization with default values for different data types. The video explains the rules for declaring and defining arrays, highlights the importance of specifying array size on the definition side, and addresses array index out of bounds exceptions. It also covers type constraints within arrays and demonstrates how to print array contents using the Arrays.toString method.

What is the correct way to loop through an array using its length?

• for (int i = 0; i <= array.length; i++)

• for (int i = 1; i <= array.length; i++)

• for (int i = 0; i < array.length; i++)

• for (int i = 1; i < array.length; i++)

What is the default value for elements in a newly created integer array?

• 1

• 0

• null

• undefined

What is the default value for elements in a newly created boolean array?

• 0

• null

• false

• true

Where should the size of an array be specified?

• It is optional

• Both sides

• On the definition side

• On the declaration side

What happens if you try to access an index beyond the array's limit?

• It returns null

• It returns the last element

• The program crashes

• ArrayIndexOutOfBoundsException is thrown

Which method is used to print the contents of an array as a string?

• Arrays.toString(array)

• System.out.println(array)

• array.toString()

• System.out.print(array)

What will System.out.println(array) print if 'array' is an array?

• The elements of the array

• The memory address of the array

• The size of the array

• An error message