Arrays & Multi-Dimensional Matrices

Fixed-size memory allocation, 2D matrices, and java.util.Arrays utilities

« Control Flow, Enhanced Switch & Loops« Previous Methods, Parameters & Method Overloading »Next »

Arrays in Java are fixed-length objects storing elements of identical type in contiguous memory.

Working with Arrays and Matrices

Declaration & Allocation: int[] numbers = new int[5]; initializes with default zeros.

Literal initialization: String[] tracks = {"Java", "Python", "SQL"};.

Arrays utility class: Arrays.sort(arr), Arrays.binarySearch(arr, val), Arrays.toString(arr).

2D Arrays (Matrix): int[][] matrix = new int[3][3];.

2D Matrix Processing in Java

Try It Yourself »

import java.util.Arrays;

public class MatrixDemo {
    public static void main(String[] args) {
        int[] scores = {95, 72, 88, 61, 100};
        Arrays.sort(scores);
        System.out.println("Sorted: " + Arrays.toString(scores));

        // 2x2 Identity Matrix
        int[][] identity = {
            {1, 0},
            {0, 1}
        };
        System.out.println("Center element: " + identity[0][0]);
    }
}

Google AdSense Slot (inContentBanner)

Set your Publisher ID in src/config/ads.ts to display live ads.

Test Yourself With Exercise

+15 XP

Which property returns the total number of elements in a Java array?

« Previous: Control Flow, Enhanced Switch & Loops Next: Methods, Parameters & Method Overloading »