Java .isEmpty()

The .isEmpty() function checks if a given ArrayList is empty. It returns true if the ArrayList is empty and false if it is not empty.

Syntax

myArrayList.isEmpty();

• myArrayList: The name of the ArrayList on which the .isEmpty() function is called.

Example

The following example demonstrates how to call the .isEmpty() function on an ArrayList named fruits:

import java.util.ArrayList;

public class Fruits {
  public static void main(String[] args) {
    // Creating a new ArrayList
    ArrayList<String> fruits = new ArrayList<String>();

    // Using the .isEmpty() function
    System.out.println("Is fruits empty: " + fruits.isEmpty());

    fruits.add("kiwi");
    fruits.add("pineapple");
    fruits.add("mango");

    System.out.println("Is fruits empty: " + fruits.isEmpty());
  }
}

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The above example will give the following output:

Is fruits empty: true
Is fruits empty: false

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Above, the .isEmpty() function returns true in the first case because fruits was initially empty. Then, in the second case, it returns false as it is called after the three fruits are added to fruits.