Chapter 8: Multi-Dimensional Arrays

Question 1

What’s a two-dimensional array?

Answer 1

An array that contains other arrays as its elements, it can form a table (5x5).

Question 2

What’s the syntax for declaring a two-dimensional array?

Answer 2

elementType [] [] arrayRefVar;
EXAMPLE
int[][] matrix;

Question 3

What are the two indexes in a multi-dimensional array?

Answer 3

Row index and column index

Question 4

What is a ragged array and how does it work?

Answer 4

A multi-dimensional array is technically multiple single row arrays stored together in an array. You can have different length arrays inside a multi array, which is called a ragged array.

Question 5

What’s a common way to process a two-way array?

Answer 5

Nested for loops. The loop for entering columns should be nested inside the loop for rows.