A two-dimensional array organizes elements in rows and columns
Declaring a 2D array in Java initializes all elements to the default value, which is 0
You declare a 2D array in Java by specifying the number of rows and columns.
True
Each element in a 2D array is accessed using two indices: one for the row and one for the column.
True
What is the default value for elements in a 2D array of integers when declared in Java?
0
How do you access an element in a 2D array named `arrayName` with row index `r` and column index `c`?
arrayName[r][c]
What is the purpose of a row index and a column index when accessing elements in a 2D array?
Specify the element position
How do you access an element in a 2D array using row and column indices?
grid[row][column]
Steps to iterate through a 2D array using nested loops
1️⃣ Outer loop iterates through the rows
2️⃣ Inner loop iterates through the columns
3️⃣ Access each element using row and column indices
What does the outer loop in nested loops for a 2D array iterate through?
Rows
How do you declare a 2D array in Java with 3 rows and 4 columns?
int[][] grid = new int[3][4];
Match the 2D array concepts with their descriptions:
Declaration ↔️ Creates the array structure
Initialization ↔️ Assigns default values
Iteration ↔️ Accesses each element
Accessing ↔️ Uses row and column indices
A 2D array organizes elements in rows and columns.
True
All elements in a newly created 2D array of integers in Java are initialized to 0.
True
When initializing a 2D array in Java, all elements are set to their default value.
True
Steps to iterate through a 2D array using nested loops
1️⃣ Outer loop iterates through the rows
2️⃣ Inner loop iterates through the columns for each row
3️⃣ Use row and column indices to access elements
To manipulate elements in a 2D array, you use row and column indices to assign new values
What is a two-dimensional array, or 2D array, in computer science?
A data structure
How do you declare a 2D array of integers in Java with 3 rows and 4 columns?
int[][] grid = new int[3][4];
How do you access the element in the second row and third column of a 2D array named `grid`?
grid[1][2]
A two-dimensional array is also known as a 2D array.
To declare a 2D array in Java, you use the keyword new.
What is the syntax for declaring a two-dimensional array in Java?
dataType[numRows][numColumns]
To access individual elements in a 2D array, you use both a row index and a column index.
The `grid[row][col]` syntax accesses the element at the current row and column during nested loop iteration.
True
Each element in the 2D array is accessed using two indices
Here's how you declare a 2D array in Java
To access the element in the second row and third column of a 2D array named `grid`, you would use grid[1][2]
To access individual elements in a 2D array, you use both a row index and a column index
The outer loop in nested loops for 2D arrays iterates through the columns.
False
What value would replace `grid[0][1]` after the statement `grid[0][1] = 10` in the given example?
10
The syntax for declaring a 2D array in Java is `dataType[][] arrayName = new dataType[numRows][numColumns];`, where `numRows` and `numColumns` specify the number of rows and columns
All elements in a newly declared 2D array of integers are initialized to 0.
True
When a 2D array of integers is initialized in Java, all elements are set to 0 by default.
True
The index `grid[1][2]` refers to the element in the second row and third column.
True
To iterate through a two-dimensional array, you use nested loops
A two-dimensional array organizes elements in rows and columns
When a 2D array is created in Java, all integer elements are initialized to 0.
True
What is a two-dimensional array also known as?
2D array
How do you create a 2D array in Java with 3 rows and 4 columns?