ConcurrentSkipListMap isEmpty() method in Java with Examples

Last Updated : 14 Feb, 2019
The isEmpty() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which returns boolean value that is it returns true if this map contains no key-value mappings otherwise false. Syntax: 
public boolean isEmpty()
Parameter: The function does not accepts any parameters. Return Value: The function returns true if this map contains no key-value mappings or else false. Below programs illustrate the above method: Program 1: Java 
// Java Program Demonstrate isEmpty()
// method of ConcurrentSkipListMap

import java.util.concurrent.*;

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

        // Initializing the map
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();

        // Adding elements to this map
        for (int i = 1; i <= 5; i++)
            mpp.put(i, i);

        // checking if map is empty
        System.out.println(mpp.isEmpty());
    }
}
Output: 
false
Program 2: Java 
// Java Program Demonstrate isEmpty()
// method of ConcurrentSkipListMap

import java.util.concurrent.*;

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

        // Initializing the map
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();

        // checking if map is empty
        System.out.println(mpp.isEmpty());
    }
}
Output: 
true
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html#isEmpty--
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