Open In App

SortedMap clear() method in Java with Examples

Improve
Improve
Like Article
Like
Save
Share
Report

The clear() method in SortedMap Java is used to clear and remove all of the elements or mappings from a specified SortedMap collection.

Syntax:

void clear()

Parameters: The method does not accept any parameters.

Return Value: The method does not return any value.

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

Below programs are used to illustrate the working of clear() Method:

Program 1: Mapping String Values to Integer Keys.




// Java code to illustrate the clear() method
  
import java.util.*;
  
public class Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty SortedMap
        SortedMap<Integer, String> map
            = new TreeMap<Integer, String>();
  
        // Mapping string values to int keys
        map.put(10, "Geeks");
        map.put(15, "4");
        map.put(20, "Geeks");
        map.put(25, "Welcomes");
        map.put(30, "You");
  
        // Displaying the Map
        System.out.println(
            "Initial Mappings are: "
            + map);
  
        // Clearing the sorted map using clear()
        map.clear();
  
        // Displaying the final SortedMap
        System.out.println(
            "Finally the maps"
            + " look like this: "
            + map);
    }
}


Output:

Initial Mappings are:
 {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
Finally the maps look like this: {}

Program 2: Mapping Integer Values to String Keys.




// Java code to illustrate the clear() method
  
import java.util.*;
  
public class Map_Demo {
    public static void main(String[] args)
    {
        // Creating an empty SortedMap
        SortedMap<String, Integer> map
            = new TreeMap<String, Integer>();
  
        // Mapping int values to string keys
        map.put("Geeks", 10);
        map.put("4", 15);
        map.put("Geeks", 20);
        map.put("Welcomes", 25);
        map.put("You", 30);
  
        // Displaying the SortedMap
        System.out.println(
            "Initial Mappings are: "
            + map);
  
        // Clearing the SortedMap using clear()
        map.clear();
  
        // Displaying the final Map
        System.out.println(
            "Finally the maps "
            + "look like this: "
            + map);
    }
}


Output:

Initial Mappings are:
 {4=15, Geeks=20, Welcomes=25, You=30}
Finally the maps look like this: {}

Note: The same operation can be performed with any type of Mapping with variation and combination of different data types.

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#clear()



Last Updated : 30 Sep, 2019
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads