WeakHashMap containsKey(Object) in Java

containsKey(Object): This method is available in java.util.WeakHashMap class of Java.

Syntax:

boolean java.util.WeakHashMap.containsKey(Object key)

This method takes one argument. This method returns true if this map contains a mapping for the specified key.

Parameters: One parameter is required for this method.

key: The key whose presence in this map is to be tested.

Returns: true if there is a mapping for key; false otherwise.

Exceptions: NA

Approach

Java

import java.util.WeakHashMap;

public class WeakHashMapcontainsKey {
    public static void main(String[] args) {

        WeakHashMap<String, String> weakHashMap =
              new WeakHashMap<String, String>();

        weakHashMap.put("Java", "Program");
        weakHashMap.put("Hello", "World");

        String key = "Hello";

        System.out.println(weakHashMap.containsKey(key));
    }
}

Output:

true