java check if arraylist is empty code example

Example 1: how to check if a list is empty java

if (list != null && !list.isEmpty()) { do something }

Example 2: ArrayList isEmpty() method in java

import java.util.ArrayList;
public class ArrayListIsEmptyMethodExample
{
   public static void main(String[] args)
   {
      ArrayList<Integer> al = new ArrayList<Integer>();
      // before checking ArrayList using isEmpty() method
      System.out.println("Is ArrayList empty: " + al.isEmpty());
      al.add(86);
      al.add(25);
      al.add(53);
      al.add(85);
      // after checking ArrayList using isEmpty() method
      System.out.println("Is ArrayList empty: " + al.isEmpty());
      for(Integer num : al)
      {
         System.out.println(num);
      }
   }
}

Example 3: validation list empty java

public class ArrayListExample 
{
    public static void main(String[] args) 
    {
        ArrayList<String> list = new ArrayList<>();
         
        System.out.println(list.isEmpty());     //true
         
        list.add("A");
         
        System.out.println(list.isEmpty());     //false
         
        list.clear();
         
        System.out.println(list.isEmpty());     //true
    }
}