WeakHashMap isEmpty() Method in Java with Examples

SortedMap isEmpty() method in Java with Examples

Last Updated : 21 Jan, 2021

The isEmpty() method of SortedMap interface in Java is used to check if a map is having any entry for key and value pairs. If no mapping exists, then this returns true.

Syntax:

boolean isEmpty()

Parameters: This method has no argument.

Returns: This method returns True if the map does not contain any key-value mapping.

Note: The isEmpty() method in SortedMap is inherited from the Map interface in Java

Below programs show the implementation of int isEmpty() method:

Program 1:

Java

// Java code to show the implementation of
// isEmpty method in SortedMap interface

import java.util.*;

public class GfG {

    // Driver code
    public static void main(String[] args)
    {

        // Initializing a SortedMap
        SortedMap<String, String> map
            = new TreeMap<>();

        System.out.println(map);

        System.out.println(map.isEmpty());
    }
}

Output:

{}
true

Program 2: Below is the code to show the implementation of isEmpty().

Java

// Java code to show the implementation of
// isEmpty method in SortedMap interface

import java.util.*;

public class GfG {

    // Driver code
    public static void main(String[] args)
    {

        // Initializing a SortedMap
        SortedMap<String, String> map
            = new TreeMap<>();

        map.put("1", "One");
        map.put("3", "Three");
        map.put("5", "Five");
        map.put("7", "Seven");
        map.put("9", "Ninde");
        System.out.println(map);

        System.out.println(map.isEmpty());
    }
}

Output:

{1=One, 3=Three, 5=Five, 7=Seven, 9=Ninde}
false

Reference: https://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html#contains(java.lang.Object)

WeakHashMap isEmpty() Method in Java with Examples

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