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
// Java code to show the implementation of// remove method in SortedMap interfaceimport 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); }} |
Output:
{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
// Java code to show the implementation of// remove method in SortedMap interfaceimport 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); }} |
Output:
{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)
