This page contains 40+ source code examples of the ArrayList class in Java.

On this page, we will learn everything about the Java ArrayList class with source code examples. We will learn about different ArrayList operations and methods with the help of coding examples.

Following are few key points to note about ArrayList in Java -

1. An ArrayList is a re-sizable array, also called a dynamic array. It grows its size to accommodate new elements and shrinks the size when the elements are removed.

2. ArrayList internally uses an array to store the elements. Just like arrays, It allows you to retrieve the elements by their index.

3. Java ArrayList allows duplicate and null values.
   Java ArrayList is an ordered collection. It maintains the insertion order of the elements.

4. You cannot create an ArrayList of primitive types like int, char etc. You need to use boxed types like Integer, Character, Boolean etc.

5. Java ArrayList is not synchronized. If multiple threads try to modify an ArrayList at the same time, then the final outcome will be non-deterministic. You must explicitly synchronize access to an ArrayList if multiple threads are gonna modify it.

Java ArrayList Examples

1. Sort List of Integers in Ascending and Descending Order Example
2. List (ArrayList) Iterator Example
3. Create the Immutable ArrayList with List.of() Method Example
4. Create Immutable ArrayList with Collections.unmodifiableList() Exmaple
5. Java 10 - Copy List into Another List Exmaple
6. Java 8 - Copy List into Another List Example
7. Java - Copy a List to Another List using Collections.copy() method
8. Java - Copy a List to Another List Example
9. Java ArrayList spliterator() Method Example
10. Java ArrayList sort() Method Example
11. Java ArrayList retainAll() Method Example
12. Java ArrayList removeIf() Method Example
13. Java ArrayList removeAll() Method Example
14. Java ArrayList remove() Method Example
15. Java ArrayList lastIndexOf() Method Example
16. Java ArrayList isEmpty() Method Example
17. Java util ArrayList indexOf() Method Example
18. Java ArrayList get() Method Example
19. Java ArrayList ensureCapacity() Method Example
20. Java ArrayList contains() Method Example
21. Java ArrayList clone() Method Example
22. Java ArrayList clear() Method Example
23. Java ArrayList addAll() Method Example
24. Java ArrayList add() Method Example
25. Java 8 forEach() List Example
26. Add Enum Values to ArrayList Example
27. Join List Strings with Commas in Java
28. Java Stream filter null values example
29. Java ArrayList subList() Example
30. Get Index of Elements in ArrayList Example
31. Java ArrayList removeIf() Example
32. Java ArrayList add(), get() and set() Method Example
33. Iterate over ArrayList Using forEach Java
34. Iterate over ArrayList using Iterator in Java
35. Java ArrayList indexOf() and lastIndexOf() Example
36. Search an Element in an ArrayList in Java
37. Clear ArrayList in Java Example
38. Java ArrayList removeAll() Method Example
39. Java ArrayList remove() Method Example
40. How to Iterate over ArrayList in Java
41. How to Remove Element from ArrayList in Java
42. How to Access Elements of ArrayList in Java
43. Create ArrayList from Another ArrayList in Java
44. How to Create an ArrayList and Add Elements to It

Original Post

Java ArrayList Examples