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The isEmpty() method of CopyOnWriteArrayList method in Java
To check whether the list is empty or not, use the isEmpty() method. TRUE is returned if the list is empty, else FALSE is the return value.
The syntax is as follows
boolean isEmpty()
To work with CopyOnWriteArrayList class, you need to import the following package
import java.util.concurrent.CopyOnWriteArrayList;
The following is an example to implement CopyOnWriteArrayList class isEmpty() method in Java
Example
import java.util.concurrent.CopyOnWriteArrayList;
public class Demo {
public static void main(String[] args) {
CopyOnWriteArrayList<Integer> arrList = new CopyOnWriteArrayList<Integer>();
arrList.add(30);
arrList.add(40);
arrList.add(60);
arrList.add(70);
arrList.add(90);
arrList.add(100);
arrList.add(120);
System.out.println("CopyOnWriteArrayList = " + arrList);
System.out.println("Is the CopyOnWriteArrayList empty? " + arrList.isEmpty());
}
}Output
CopyOnWriteArrayList = [30, 40, 60, 70, 90, 100, 120] Is the CopyOnWriteArrayList empty? False
Let us see another example
Example
import java.util.concurrent.CopyOnWriteArrayList;
public class Demo {
public static void main(String[] args) {
CopyOnWriteArrayList<Integer> arrList = new CopyOnWriteArrayList<Integer>();
arrList.add(30);
arrList.add(40);
arrList.add(60);
arrList.add(70);
arrList.add(90);
arrList.add(100);
arrList.add(120);
System.out.println("CopyOnWriteArrayList = " + arrList);
System.out.println("Is the CopyOnWriteArrayList empty? " + arrList.isEmpty());
arrList.clear();
System.out.println("Updated CopyOnWriteArrayList = " + arrList);
System.out.println("Is the updated CopyOnWriteArrayList empty? " + arrList.isEmpty());
}
}Output
CopyOnWriteArrayList = [30, 40, 60, 70, 90, 100, 120] Is the CopyOnWriteArrayList empty? false Updated CopyOnWriteArrayList = [] Is the updated CopyOnWriteArrayList empty? True
Updated on: 30-Jul-2019
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