Arrays and ArrayLists

Build lists of data with Java arrays and ArrayLists.

Key Concepts

Review core concepts you need to learn to master this subject

Index

Arrays

Array creation in Java

Changing an Element Value

Java ArrayList

Modifying ArrayLists in Java

int[] marks = {50, 55, 60, 70, 80};

System.out.println(marks[0]);
// Output: 50

System.out.println(marks[4]);
// Output: 80

An index refers to an element’s position within an array.

The index of an array starts from 0 and goes up to one less than the total length of the array.

Learn Java: Arrays

Lesson 1 of 2

Portfolio projects that showcase your new skills

Stress-test your knowledge with quizzes that help commit syntax to memory