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 void main(String[] a) {
        HashMap<String, String> map = new HashMap<String, String>();
        map.put("key1", "value1");
        map.put("key2", "value2");
        map.put("key3", "value3");
        map.put(null, null);

        HashMap<String, String> map2 = new HashMap<String, String>();
        map2.put("key4", "value4");
        map2.put("key5", "value5");
        map2.put("key6", "value6");
        map.putAll(map2);

        System.out.println(map);
    }
}