5 Questions
How do you declare a two-dimensional array in Java?
You declare a two-dimensional array in Java using the syntax: Data type ArrayName[][];
What are the two ways to store a two-dimensional array in one-dimensional computer memory?
A two-dimensional array may be stored in one-dimensional computer memory in either row major order or column major order.
How are the indices generally considered in a 2D array?
In a 2D array, the first index is generally considered to be the row, and the second index is considered to be the column.
How can you directly assign values to create a two-dimensional array in Java?
You can directly assign values to create a two-dimensional array in Java using the syntax: int[][] m = {{1,2,3},{4,5,6},{7,8,9}};
What are the default values of arrays in Java?
The default values of arrays in Java are 0 for numeric types and null for reference types.
Study Notes
Declaring a Two-Dimensional Array in Java
- A two-dimensional array is declared in Java by using two sets of square brackets
[][]after the data type, such asint[][] arrayName.
Storing a Two-Dimensional Array in One-Dimensional Memory
- There are two ways to store a two-dimensional array in one-dimensional computer memory:
- Row-Major Order: where the elements of the first row are stored first, followed by the elements of the second row, and so on.
- Column-Major Order: where the elements of the first column are stored first, followed by the elements of the second column, and so on.
Indices in a 2D Array
- The indices in a 2D array are generally considered as
[row][column], where the first index specifies the row and the second index specifies the column.
Directly Assigning Values to a 2D Array
- You can directly assign values to create a two-dimensional array in Java by using the following syntax:
int[][] arrayName = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
Default Values of Arrays in Java
- The default values of arrays in Java depend on the data type:
- For numeric data types (byte, short, int, long, float, double), the default value is 0.
- For boolean data type, the default value is false.
- For character data type, the default value is '\u0000' (the Unicode character 0).
- For String data type, the default value is null.
Test your knowledge of creating, accessing, and understanding the properties of multidimensional arrays with this quiz. Explore memory allocation, accessing array elements, default values, and examples of two-dimensional arrays.
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