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BJP4 Self-Check 9.8: CarTruck

Language/Type: Java classes inheritance mystery
Author: Marty Stepp (on 2016/09/08)

Consider the following two classes:

public class Car {
    public void m1() {
        System.out.println("car 1");

    public void m2() {
        System.out.println("car 2");

    public String toString() {
        return "vroom";
public class Truck extends Car {
    public void m1() {
        System.out.println("truck 1");

And assuming that the following variables have been declared:

Car mycar = new Car();
Truck mytruck = new Truck();

What is the output from the following statements?


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