Java Arrays

Fixed-size lists of values.

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An array holds a fixed number of values of one type.

Create: int[] nums = {10, 20, 30}; or new int[5]
Access: nums[0]; length: nums.length
Multidimensional: int[][] grid = {{1, 2}, {3, 4}};
The Arrays class helps: Arrays.sort(), Arrays.toString(), Arrays.stream()

Key Takeaways: Java Arrays

Mastering Java Arrays helps you write clean and reliable Java code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

Java Arrays Code Example

Java

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        int[] marks = {72, 95, 58, 88};
        Arrays.sort(marks);
        System.out.println(Arrays.toString(marks));
        System.out.println("Highest: " + marks[marks.length - 1]);
        System.out.println("Sum: " + Arrays.stream(marks).sum());

        int[][] grid = {{1, 2, 3}, {4, 5, 6}};
        System.out.println("Row 2, col 3: " + grid[1][2]);
    }
}

Output

[58, 72, 88, 95]
Highest: 95
Sum: 313
Row 2, col 3: 6

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

Java Arrays Practice Exercises

Check what you learned in “Java Arrays”.

/ 2 solved

Fill in the blank

Get the number of elements in the array.

int n = nums.;

✓ Correct! Not quite. Try again.

Multiple choice

Which class has a static sort() method for arrays?

Arrays Array Collections Sorter

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Java Arrays

💡 Key Takeaways: Java Arrays

Java Arrays Code Example

Java Arrays Practice Exercises

Key Takeaways: Java Arrays