HashMap - pruebas hechas

package hashmapsimple;
public class Cuerpo
{
    public static void main(String[] args) {
        MyMap<Integer,String>col= new MyMap();
        col.put(1, "Deborah");
        col.put(2, "Tommy");
        col.put(3, "Franco");
        col.put(4, "Manuela");
        col.put(1, "Micaela");
        col.put(null,"pepe");
        java.util.HashMap<Integer, String> m = new java.util.HashMap();
        m.put(5, "Miguel");
        m.put(6, "Denisse");
        col.putAll(m);
        System.out.println(" ");
        System.out.println("con containsKey: " + col.containsKey(1));
        System.out.println("con containsKey: " + col.containsKey(7));
        System.out.println(" ");
        System.out.println("con get: " + col.get(1));
        System.out.println("con get: " + col.get(7));
        System.out.println(" ");
        System.out.println("con containsValue: " + col.containsValue("Franco"));
        System.out.println("con containsValue: " + col.containsValue("Rodrigo"));
        System.out.println("con containsValue: " + col.containsValue(null));
        /*------------------------------------------------------*/
        System.out.println(" ");
        System.out.println("\t ---TODOS LOS DATOS---");
        System.out.println("tamaño -> " + col.size());
        System.out.println(" ");
        System.out.println(" --valores-- ");
        col.values().stream().forEach((s) -> {
            System.out.println(s);
        });
        System.out.println(" ");
        System.out.println(" --claves-- ");
        col.keySet().stream().forEach((s) -> {
            System.out.println(s);
        });
        System.out.println(" ");
        System.out.println(" --entradas-- ");
        col.entrySet().stream().forEach((e)->{
            System.out.println("clave -> "+ e.getKey() +" valor -> "+e.getValue());
        });
        /*------------------------------------------------------*/
        col.remove(2);
        col.remove(6);
        col.remove(7);
        System.out.println("");
        System.out.println("\t ---ELIMINANDO DATOS---");
        System.out.println("tamaño -> " + col.size());
        System.out.println(" ");
        System.out.println(" --valores-- ");
        col.values().stream().forEach((s) -> {
            System.out.println(s);
        });
        System.out.println(" ");
        System.out.println(" --claves-- ");
        col.keySet().stream().forEach((s) -> {
            System.out.println(s);
        });
        System.out.println(" ");
        System.out.println(" --entradas-- ");
        col.entrySet().stream().forEach((e)->{
            System.out.println("clave -> "+ e.getKey() +" valor -> "+e.getValue());
        });
        /*------------------------------------------------------*/
        col.clear();
        System.out.println("");
        System.out.println("\t ---LIMPIANDO MAP---");
        System.out.println("tamaño -> " + col.size());
        System.out.println(" ");
        System.out.println(" --valores-- ");
        col.values().stream().forEach((s) -> {
            System.out.println(s);
        });
        System.out.println(" ");
        System.out.println(" --claves-- ");
        col.keySet().stream().forEach((s) -> {
            System.out.println(s);
        });
        System.out.println(" ");
        System.out.println(" --entradas-- ");
        col.entrySet().stream().forEach((e)->{
            System.out.println("clave -> "+ e.getKey() +" valor -> "+e.getValue());
        });
    }
}