Computer scienceProgramming languagesJavaWorking with dataCollectionsCollection Implementations

WeakHashMap

WeakHashMap in action

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Remove a strong reference from the author1 variable object and run garbage collection via a System.gc(). In the end, the size() method must return 1.

Sample Input 1:

Joshua Bloch
Bruce Eckel
Effective Java
Thinking in Java

Sample Output 1:

Your map size is 1. The only value is Thinking in Java

Write a program in Java 17

import java.util.Scanner;

import java.util.Map;

import java.util.WeakHashMap;

public class Main {

public static void main(String[] args) throws InterruptedException {

Scanner scanner = new Scanner(System.in);

String author1 = new String(scanner.nextLine());

String author2 = new String(scanner.nextLine());

Map<String, String> map = ... // inititalize an instance of WeakHashMap

map.put(author1, scanner.nextLine());

map.put(author2, scanner.nextLine());

// write your code here

System.out.printf("Your map size is %d. The only value is %s", map.size(), map.get(author2));

}

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