SortedMap clear() method in Java with Examples
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.
import java.util.*;
public class Map_Demo {
public static void main(String[] args)
{
SortedMap<Integer, String> map
= new TreeMap<Integer, String>();
map.put( 10 , "Geeks" );
map.put( 15 , "4" );
map.put( 20 , "Geeks" );
map.put( 25 , "Welcomes" );
map.put( 30 , "You" );
System.out.println(
"Initial Mappings are: "
+ map);
map.clear();
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.
import java.util.*;
public class Map_Demo {
public static void main(String[] args)
{
SortedMap<String, Integer> map
= new TreeMap<String, Integer>();
map.put( "Geeks" , 10 );
map.put( "4" , 15 );
map.put( "Geeks" , 20 );
map.put( "Welcomes" , 25 );
map.put( "You" , 30 );
System.out.println(
"Initial Mappings are: "
+ map);
map.clear();
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
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