Collections.checkedMap(Map, Class, Class) in Java

Collections.checkedMap(Map, Class, Class): This method is available in java.util.Collections class of Java.

Syntax:

<E1, E2> Map<E1, E2> java.util.Collections.checkedMap(Map<E1, E2> m, Class<E1> keyType, Class<E2> valueType)

This method takes three arguments. This method returns a dynamical type safe view of the specified map.

Note: Any attempt to insert a mapping whose key or value has the wrong type will result in an immediate ClassCastException.

Parameters: Three parameters are required for this method.

m: the map for which a dynamically typesafe view is to be returned.

keyType: the type of key that m is permitted to hold.

valueType: the type of value that m is permitted to hold.

Returns: a dynamically typesafe view of the specified map.

Exceptions: NA

Approach

Java

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class CollectionscheckedMap {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<String,
                                            Integer>();
        map.put("Hello", 1);
        map.put("Jave", 2);
        System.out.println(Collections.checkedMap(map, 
                         String.class, Integer.class));

    }
}

Output:

{Hello=1, Jave=2}