The remove() method of SortedMap interface in Java is used to remove the mapping for a key from this map if it is present in the map.
Syntax:
V remove(Object key)
Parameters: This method has the only argument key whose mapping is to be removed from the map.
Returns: This method returns the value to which this SortedMap previously associated the key, or null if the SortedMap contained no mapping for the key.
Note: The remove() method in SortedMap is inherited from the Map interface in Java.
Below programs illustrate the implementation of remove() method:
Program 1:
// Java code to show the implementation of // remove method in SortedMap interface import java.util.*;
public class GfG {
// Driver code
public static void main(String[] args)
{
// Initializing a SortedMap
SortedMap<Integer, String> map
= new TreeMap<>();
map.put( 1 , "One" );
map.put( 3 , "Three" );
map.put( 5 , "Five" );
map.put( 7 , "Seven" );
map.put( 9 , "Nine" );
System.out.println(map);
map.remove( 3 );
System.out.println(map);
// If it doesn't exists, returns
// null and does not affects the map
map.remove( 2 );
System.out.println(map);
}
} |
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine} {1=One, 5=Five, 7=Seven, 9=Nine} {1=One, 5=Five, 7=Seven, 9=Nine}
Program 2: Below is the code to show the implementation of remove().
// Java code to show the implementation of // remove 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" , "Nine" );
System.out.println(map);
map.remove( "3" );
System.out.println(map);
}
} |
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine} {1=One, 5=Five, 7=Seven, 9=Nine}
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#put(K, %20V)