Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

public class Main {
    public static final void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("one", "a");
        System.out.println("Size = " + map.size());
        map.put(null, "b");
        System.out.println("Size = " + map.size());
        System.out.println("map.get(null) = " + map.get(null));
    }
}