4 · Data & Collections · lesson 19 of 41
Arrays
Fixed-size, contiguous, index-from-zero.
Java
int[] nums = new int[5]; // {0,0,0,0,0}
int[] primes = {2, 3, 5, 7, 11};
System.out.println(primes[2]); // 5
System.out.println(primes.length);
int[][] grid = new int[3][3]; // multidimensionalWATCH OUT
Out-of-range access throws ArrayIndexOutOfBoundsException.
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Key takeaways
- ✓Length is fixed at creation.
- ✓Multidim arrays are arrays of arrays.