Java ArrayList isEmpty() Method

December 13, 2022

What is ArrayList?

ArrayList provides us with dynamic arrays. The ArrayLists are resizable in nature , we can add or remove an element at anytime. It is not compulsory to mention size while declaring it. The ArrayList is a part of Java framework and can be found in the java.util pacakge. ArrayList have many inbuilt methods which we can use. One of them is Java ArrayList isEmpty() Method.

Here on this page we will discuss about ArrayList isEmpty() method.

Java ArrayList isEmpty() Method

The isEmpty() method can be found in java.util.ArrayList package. This method is used to check if list is empty or not . It returns true if the ArrayList is empty else it returns false. It’s syntax , parameters, output are discussed below with examples.

isEmpty() Syntax :

ArrayList.isEmpty()

isEmpty() Parameters :

this method does not take any parameters

isEmpty() return value

True: When ArrayList is empty.
False: When ArrayList contains any element.

Polymorphism in Java

Encapsulation in Java

Abstraction in Java

Multithreading in Java

ArrayList isEmpty() Method Examples:

Example 1 :

Run

import java.util.ArrayList;

class Main {
    public static void main(String[] args) {
        // creating an String ArrayList
        ArrayList list = new ArrayList<>();

        // insert element to the arraylist
        list.add("Prep");
        list.add("Insta");
        list.add("Prime");

        // check if list is empty or not
        boolean result = list.isEmpty();

        System.out.println("list is empty: "+ result);
    }
}

Output

list is empty: false

Reason: The output is false because the ArrayList 'list' is not empty.

Example 2 :

Run

import java.util.ArrayList;

class Main {
    public static void main(String[] args) {
        // creating an String ArrayList
        ArrayList list = new ArrayList<>();



        // remove the element Prime from the list
        boolean result = list.isEmpty();

        System.out.println("list is empty: "+ result);
    }
}

Output

list is empty: true

Reason: The output is true because the ArrayList 'list' is empty.

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Java ArrayList isEmpty() Method

What is ArrayList?

Java ArrayList isEmpty() Method

isEmpty() Syntax :

isEmpty() Parameters :

isEmpty() return value

ArrayList isEmpty() Method Examples:

Example 1 :

Output

Example 2 :

Output

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