CopyOnWriteArrayList isEmpty() method in Java
Last Updated :
26 Nov, 2018
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:
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
CopyOnWriteArrayList<Integer> ArrLis
= new CopyOnWriteArrayList<Integer>();
ArrLis.add( 32 );
ArrLis.add( 67 );
ArrLis.add( 98 );
ArrLis.add( 100 );
System.out.println( "CopyOnWriteArrayList: " + ArrLis);
if (ArrLis.isEmpty())
System.out.println( "List is empty" );
else
System.out.println( "List is not empty" );
ArrLis.clear();
if (ArrLis.isEmpty())
System.out.println( "List is empty" );
else
System.out.println( "List is not empty" );
}
}
|
Output:
CopyOnWriteArrayList: [32, 67, 98, 100]
List is not empty
List is empty
Program 2:
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
CopyOnWriteArrayList<String> ArrLis
= new CopyOnWriteArrayList<String>();
ArrLis.add( "gopal" );
ArrLis.add( "gfg" );
ArrLis.add( "jgec" );
ArrLis.add( "sudo" );
System.out.println( "CopyOnWriteArrayList: " + ArrLis);
if (ArrLis.isEmpty())
System.out.println( "List is empty" );
else
System.out.println( "List is not empty" );
ArrLis.clear();
if (ArrLis.isEmpty())
System.out.println( "List is empty" );
else
System.out.println( "List is not empty" );
}
}
|
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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