Creating arrays
Description
An array declaration includes brackets.
Explanation
You can provide values immediately or create a chosen size.
Example
int[] scores = {82, 91, 76};← Chapter 5 — Arrays, Memory & Methods
19. Arrays
mixed
Description
An array stores a fixed number of values of one type. Each value has an index, beginning at zero.
Arrays are useful when the size is known. Later, collections such as ArrayList provide more flexible resizing.
Subtopics
Reading elements
Description
Use an index in brackets.
Explanation
Valid indexes go from 0 to length - 1.
Example
int first = scores[0];Explanation
Accessing an invalid index causes ArrayIndexOutOfBoundsException. A loop condition using i < array.length is a safe, standard pattern.
Example
public class ArrayDemo {
public static void main(String[] args) {
int[] scores = {82, 91, 76};
for (int score : scores) {
System.out.println(score);
}
}
}Key points
- Array indexes start at zero.
- Arrays have a fixed length.
- All elements have the same type.