Make a list in java how to#

ImmutableList.get(1).setClassName('MCA') List immutableList = List.of(student1, student2, student3) Student student3 = new Student(3, 'BCA', 'Ravi') Student student2 = new Student(2, 'BCA', 'Ram') Student student1 = new Student(1, 'MCA', 'Ravi') But you can’t change the number of students in the immutable list (add or delete student).

You can change the name of the student, class name, and roll no. Each student has a name, class, roll no, etc. Let’s say you have an immutable list that stores the 5 students’ records. In an immutable list, the user can modify the object properties but not the object. Multiple threads can share immutable set data without worrying about synchronization. It uses the new operator to instantiate the list by allocating memory and returning a. The most common use case of an immutable set is in a multi-threaded environment. You can declare a List of Lists in Java, using the following syntax. Because if the user tries to modify(add or remove from list ) the list then the compiler will throw UnsupportedOperationException. The immutable list is thread-safe because Making it immutable will create a “read-only” version of our set.Īs we already discuss the immutable list is ready only. It means the object is immutable and carries some values. Suppose we have an immutable List with some values. The same logic applies to an immutable List. Because multiple threads can read them only, they can’t change the object’s state. These objects are thread-safe by default. Advantages/Need of immutable listĪs you know, an immutable object will not change after the declaration. You can’t modify the content of the immutable List after declaration. It means the immutable List is read-only. The important concepts of Immutable List What is an immutable List in Java?Īs you know List provides some Classes like ArrayList that is growable Array that can increase or decrease the size itself when the modification is done by the user.Īn immutable List is a type of List that is immutable. Iv) We can create ImmutableList by Using Builder() methodĥ. Ii) We can create ImmutableList by Using Of() method List Class in Java 9 Factory. Create a List composed of the elements of this Iterable, repeated a certain number of times. Ii) By using of() method of ImmutableList class we can create ImmutableList I) By use of copyOf() method We can create ImmutableList Here is the table content of the article will we will cover this topic.

In this tutorial, we will learn what is immutable List in Java and how to make an immutable list. There are many ways to create a mutable ArrayList in java.

Make a list in java how to#

In recent posts, we have seen how to create an ArrayList in java.