ArrayList isEmpty() Method in Java with Examples

// Java program to demonstrate the use of isEmpty() 
// method with ArrayList of Integers
import java.util.ArrayList;

public class GFG {
    public static void main(String[] args) {
      
        // Creating an empty ArrayList of Integers
        ArrayList<Integer> n = new ArrayList<>();

        // Checking if the ArrayList is empty
        boolean res = n.isEmpty();

        System.out.println("" + res);

        // Adding an element 
        // to the ArrayList
        n.add(21);

        // Checking again if the 
        // ArrayList is empty
        res = n.isEmpty();
        System.out.println("" + res);
    }
}

// Java program to demonstrate the use of 
// isEmpty() method with ArrayList of Strings
import java.util.ArrayList;

public class GFG {
    public static void main(String[] args) {
      
        // Creating an ArrayList of Strings
        ArrayList<String> s = new ArrayList<>();

        // Checking if the ArrayList is empty
        System.out.println("" + s.isEmpty());

        // Adding an element to 
        // the ArrayList
        s.add("Cherry");

        // Checking again if the 
        // ArrayList is empty
        System.out.println("" + s.isEmpty());
    }
}

// Java program to demonstrate the use of 
// isEmpty() method with custom Objects
import java.util.ArrayList;

class Person {
    String n;
    int a;

    // Constructor
    public Person(String n, int a) {
        this.n = n;
        this.a = a;
    }
}

public class Main {
    public static void main(String[] args) {
      
        // create an ArrayList of Person objects
        ArrayList<Person> p = new ArrayList<>();

        // check if the ArrayList is empty
        System.out.println("" + p.isEmpty());

        // add a Person object to the ArrayList
        p.add(new Person("Sweta", 24));

        // check again if the ArrayList is empty
        System.out.println("" + p.isEmpty());
    }
}