Key Concepts

Review core concepts you need to learn to master this subject

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.