CopyOnWriteArrayList isEmpty() method in Java

The isEmpty(E e) method of CopyOnWriteArrayList checks if the list is empty or not. It returns true if the list is empty, else it returns false.

Syntax:

public boolean isEmpty()

Parameters: The function does not accepts any parameter.

Return Value: The function returns true if the list is empty, otherwise it returns false.

Below programs illustrate the above function:



Program 1:

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// Java Program to illustrate the 
// isEmpty() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<Integer> ArrLis
            = new CopyOnWriteArrayList<Integer>();
  
        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " + ArrLis);
  
        // check using function
        if (ArrLis.isEmpty())
            System.out.println("List is empty");
        else
            System.out.println("List is not empty");
  
        ArrLis.clear();
  
        // check using function
        if (ArrLis.isEmpty())
            System.out.println("List is empty");
        else
            System.out.println("List is not empty");
    }
}

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Output:

CopyOnWriteArrayList: [32, 67, 98, 100]
List is not empty
List is empty

Program 2:

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// Java Program to illustrate the 
// isEmpty() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<String> ArrLis
            = new CopyOnWriteArrayList<String>();
  
        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " + ArrLis);
  
        // check using function
        if (ArrLis.isEmpty())
            System.out.println("List is empty");
        else
            System.out.println("List is not empty");
  
        ArrLis.clear();
  
        // check using function
        if (ArrLis.isEmpty())
            System.out.println("List is empty");
        else
            System.out.println("List is not empty");
    }
}

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Output:

CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
List is not empty
List is empty

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#isEmpty–

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