How to make a new List in Java

0 votes

We create a Set as:

Set myset = new HashSet()

How do we create a List in Java?

Dec 28, 2020 in Java by anonymous
• 8,910 points
519 views

2 answers to this question.

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List myList = new ArrayList();

or with generics (Java 7 or later)

List<MyType> myList = new ArrayList<>();

or with generics (Old java versions)

List<MyType> myList = new ArrayList<MyType>();

Hope this helps!

Check out Java certification course to become certified expert.

Thanks!

answered Dec 28, 2020 by Gitika
• 65,910 points
0 votes

Initializing a List in Java

The Java.util.List is a child interface of Collection. It is an ordered collection of objects in which duplicate values can be stored. Since List preserves the insertion order, it allows positional access and insertion of elements. List Interface is implemented by ArrayList, LinkedList, Vector, and Stack classes.

List is an interface, and the instances of List can be created in the following ways:

List a = new ArrayList();
List b = new LinkedList();
List c = new Vector(); 
List d = new Stack(); 

Examples:

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import java.util.*;

import java.util.function.Supplier;

  

public class GFG {

    public static void main(String args[])

    {

  

        // For ArrayList

        List<Integer> list = new ArrayList<Integer>();

        list.add(1);

        list.add(3);

        System.out.println("ArrayList : " + list.toString());

  

        // For LinkedList

        List<Integer> llist = new LinkedList<Integer>();

        llist.add(2);

        llist.add(4);

        System.out.println("LinkedList : " + llist.toString());

  

        // For Stack

        List<Integer> stack = new Stack<Integer>();

        stack.add(3);

        stack.add(1);

        System.out.println("Stack : " + stack.toString());

    }

}

Output:

ArrayList : [1, 3]
LinkedList : [2, 4]
Stack : [3, 1]
answered Dec 28, 2020 by Thomas Walenta

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