Tag: How to call ArrayList method in Java

List<Student> students = new ArrayList<Student>(); Student foo = new Student(23, “Foo”, 22); students. add(foo); // This is how you add to a List (in this case a List of Student objects and more precisely an ArrayList of Students).

The ArrayList class is a resizable array, which can be found in the java. util package . The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified (if you want to add or remove elements to/from an array, you have to create a new one).

Syntax: Class_Name obj[ ]= new Class_Name[Array_Length]; For example, if you have a class Student, and we want to declare and instantiate an array of Student objects with two objects/object references then it will be written as: Student[ ] studentObjects = new Student[2];

To create an array list in Java, you declare an ArrayList variable and call the ArrayList constructor to instantiate an ArrayList object and assign it to the variable : ArrayList friends = new ArrayList(); You can optionally specific a capacity in the ArrayList constructor: ArrayList friends = new ArrayList(100);