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ConcurrentSkipListSet contains() method in Java

Last Updated : 17 Sep, 2018
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The contains() method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns a true boolean value if the specified element is present in this set otherwise it returns false. Syntax: 
ConcurrentSkipListSet.contains(Object o)
Parameters: The function accepts a single parameter o i.e. to be checked for the presence in this set. Return Value: The function returns a Boolean value. It returns True if the specified element is present in this set else it returns False. Below programs illustrate the ConcurrentSkipListSet.contains() method: Program 1: Java 
// Java Program Demonstrate contains()
// method of ConcurrentSkipListSet

import java.util.concurrent.*;

class ConcurrentSkipListSetContainsExample1 {
    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);

        // Checks if 9 is present in the set
        if (set.contains(9))
            System.out.println("9 is present in the set.");
        else
            System.out.println("9 is not present in the set.");
    }
}
Output: 
9 is not present in the set.
Program 2: Java 
// Java Program Demonstrate contains()
// method of ConcurrentSkipListSet */

import java.util.concurrent.*;

class ConcurrentSkipListSetContainsExample2 {
    public static void main(String[] args)
    {

        // Initializing the set
        ConcurrentSkipListSet<String>
            set = new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        set.add("Gfg");
        set.add("is");
        set.add("fun");

        // Checks if Gfg is present in the set
        if (set.contains("Gfg"))
            System.out.println("Gfg is present in the set.");
        else
            System.out.println("Gfg is not present in the set.");
    }
}
Output: 
Gfg is present in the set.
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#contains-java.lang.Object-

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