ConcurrentSkipListSet remove() method in Java

Last Updated : 17 Sep, 2018

The java.util.concurrent.ConcurrentSkipListSet.remove() method is an in-built function in Java which is used to remove an element if it is present in this set. Syntax:

ConcurrentSkipListSet.remove(Object o)

Parameters: The function accepts a single parameter o i.e. the object to be removed. Return Value: The function returns a true boolean value on successful removal of the object, otherwise returns false. Below programs illustrate ConcurrentSkipListSet.remove() method: Program 1: The element to be removed is present in the set.

Java

// Java Program Demonstrate remove()
// method of ConcurrentSkipListSet

import java.util.concurrent.ConcurrentSkipListSet;

class ConcurrentSkipListSetRemoveExample1 {
    public static void main(String[] args)
    {
        // Initializing the set
        ConcurrentSkipListSet<Integer> set = 
                         new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 1; i <= 5; i++)
            set.add(i);

        // Printing the elements of the set
        System.out.println("The elements in the set are:");
        for (Integer i : set)
            System.out.print(i + " ");

        // remove() method will remove the specified
        // element from the set
        set.remove(1);
        set.remove(5);

        // Printing the elements of the set
        System.out.println("\nRemaining elements in set : ");
        for (Integer i : set)
            System.out.print(i + " ");
    }
}

Output:

The elements in the set are:
1 2 3 4 5 
Remaining elements in set : 
2 3 4

Program 2: The element to be removed is not present in the set.

Java

// Java Program Demonstrate remove()
// method of ConcurrentSkipListSet

import java.util.concurrent.ConcurrentSkipListSet;

class ConcurrentSkipListSetRemoveExample2 {
    public static void main(String[] args)
    {
        // Initializing the set
        ConcurrentSkipListSet<Integer> set =
                       new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 10; i <= 15; i++)
            set.add(i);

        // Printing the elements of the set
        System.out.println("The elements in the set are:");
        for (Integer i : set)
            System.out.print(i + " ");

        // remove() method will remove the specified
        // element from the set
        set.remove(1);
        set.remove(5);

        // Printing the elements of the set
        System.out.println("\nRemaining elements in set : ");
        for (Integer i : set)
            System.out.print(i + " ");
    }
}

Output:

The elements in the set are:
10 11 12 13 14 15 
Remaining elements in set : 
10 11 12 13 14 15

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#remove-java.lang.Object-

Introduction to Java

rupesh_rao

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