Key Concepts

Review core concepts you need to learn to master this subject

Arrays

2D Arrays

Arrays

String[] animals = {"Giraffe", "Elephant", "Toucan"};

// Access an element via its index:
System.out.println(animals[0]); // Prints: Giraffe

// Change an element value:
animals[1] = "Lion";

// Find number of elements in an array:
System.out.println(animals.length); // Prints: 3

// Traverse array using for loop:
for (int i = 0; i < animals.length; i++) {
  System.out.println(animals[i]);
}
/* Prints:
Giraffe
Lion
Toucan
*/

// Traverse array using for-each loop
for (int i: animals) {
  System.out.println(i);
}
/* Prints:
Giraffe
Lion
Toucan
*/

An array is a collection of values with the same data type.