ConcurrentSkipListSet pollLast() method in Java
The pollLast() method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns retrieves and removes the last (highest) element, or returns null if this set is empty.
Syntax:
public E pollLast()
Return Value: The function returns retrieves and removes the last (highest) element, or returns null if this set is empty.
Below programs illustrate the ConcurrentSkipListSet.pollLast() method:
Program 1:
import java.util.concurrent.*;
class ConcurrentSkipListSetpollLastExample1 {
public static void main(String[] args)
{
ConcurrentSkipListSet<Integer> Lset = new ConcurrentSkipListSet<Integer>();
for ( int i = 10 ; i <= 50 ; i += 10 )
Lset.add(i);
System.out.println( "Contents of the set: " + Lset);
System.out.println( "The Last element of the set: " + Lset.pollLast());
System.out.println( "Contents of the set after pollLast: " + Lset);
}
}
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Output:
Contents of the set: [10, 20, 30, 40, 50]
The Last element of the set: 50
Contents of the set after pollLast: [10, 20, 30, 40]
Program 2:
import java.util.concurrent.*;
class ConcurrentSkipListSetpollLastExample2 {
public static void main(String[] args)
{
ConcurrentSkipListSet<Integer> Lset = new ConcurrentSkipListSet<Integer>();
System.out.println( "Contents of the set: " + Lset);
System.out.println( "The Last element of the set: " + Lset.pollLast());
}
}
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Output:
Contents of the set: []
The Last element of the set: null
Reference:
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#pollLast–
Last Updated :
21 Sep, 2018
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