TreeMap clear() Method in Java
The java.util.TreeMap.clear() method in Java is used to clear and remove all of the elements or mappings from a specified TreeMap.
Syntax:
Tree_Map.clear()
Parameters: The method does not accept any parameters.
Return Value: The method does not return any value.
Below programs are used to illustrate the working of java.util.TreeMap.clear() Method:
Program 1: Mapping String Values to Integer Keys.
import java.util.*;
public class Tree_Map_Demo {
public static void main(String[] args)
{
TreeMap<Integer, String> tree_map = new TreeMap<Integer, String>();
tree_map.put( 10 , "Geeks" );
tree_map.put( 15 , "4" );
tree_map.put( 20 , "Geeks" );
tree_map.put( 25 , "Welcomes" );
tree_map.put( 30 , "You" );
System.out.println( "Initial Mappings are: " + tree_map);
tree_map.clear();
System.out.println( "Finally the map looks like: " + tree_map);
}
}
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Output:
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
Finally the map looks like this: {}
Program 2: Mapping Integer Values to String Keys.
import java.util.*;
public class Tree_Map_Demo {
public static void main(String[] args)
{
TreeMap<String, Integer> tree_map = new TreeMap<String, Integer>();
tree_map.put( "Geeks" , 10 );
tree_map.put( "4" , 15 );
tree_map.put( "Geeks" , 20 );
tree_map.put( "Welcomes" , 25 );
tree_map.put( "You" , 30 );
System.out.println( "Initial Mappings are: " + tree_map);
tree_map.clear();
System.out.println( "Finally the map looks like: " + tree_map);
}
}
|
Output:
Initial Mappings are: {4=15, Geeks=20, Welcomes=25, You=30}
Finally the map looks like: {}
Note: The same operation can be performed with any type of Mapping with variation and combination of different data types.
Last Updated :
28 Jun, 2018
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