IdentityHashMap remove(Object, Object) in Java

remove(Object, Object): This method is available in java.util.IdentityHashMap class of Java.

Syntax:

boolean java.util.Map.remove(Object key, Object value)

This method takes two arguments. This method removes the entry for the specified key only if it is currently mapped to the specified value.

Parameters: Two parameters are required for this method.

key: key with which the specified value is associated.

value: value expected to be associated with the specified key.

Returns: true if the value was removed.

Throws:

1. UnsupportedOperationException - if the remove operation is not supported by this map.

2. ClassCastException - if the key or value is of an inappropriate type for this map.

3. NullPointerException - if the specified key or value is null, and this map does not permit null keys or values.

Approach

Java

import java.util.IdentityHashMap;

public class IdentityHashMapremove2 {

    public static void main(String args[]) {

        IdentityHashMap<String, Integer> identityHashMap = 
                   new IdentityHashMap<String, Integer>();

        identityHashMap.put("Java", 1);
        identityHashMap.put("Hello", 2);

        Object key = "Java", value = 1;
        System.out.println(identityHashMap.remove(key, value));

    }

}

Output:

true