Programming Concepts using Java Quiz 1: 13 July 2025 (May 2025 term)

1class Example {
2    public void methodA(int x) {
3        if (x > 0) {
4            methodB(x - 1);
5        }
6    }
7    public void methodB(int y) {
8        if (y > 0) {
9            methodC(y - 1);
10        }
11    }
12    public void methodC(int z) {
13        if (z > 0) {
14            methodA(z - 1);
15        }
16    }
17}
18
19class TestCallStack {
20    public static void main(String[] args) {
21        Example e = new Example();
22        e.methodA(3);
23    }
24}

1class Account {
2    public void login() {
3        System.out.println("Basic login");
4    }
5}
6
7class User extends Account {
8    public void login() {
9        super.login();
10        System.out.println("User login");
11    }
12    public void login(String code) {
13        System.out.println("User login with code: " + code);
14    }
15}
16
17class Admin extends User {
18    public void login() {
19        super.login();
20        System.out.println("Admin login");
21    }
22    public void login(String code) {
23        System.out.println("Admin login with code: " + code);
24    }
25}
26
27public class Test {
28    public static void main(String[] args) {
29        User obj = new Admin(); // LINE 1
30        obj.login();
31        obj.login("9999");
32    }
33}

1class Animal {
2    private String name;
3    public Animal(String n) {
4        name = n;
5    }
6    public String toString() {
7        return "Name: " + name;
8    }
9}
10class Dog extends Animal {
11    private String breed;
12    public Dog(String n, String b) {
13        //LINE 1
14        breed = b;
15    }
16    public String toString() {
17        return super.toString() + ", Breed: " + breed;
18    }
19}
20public class Test {
21    public static void main(String[] args) {
22        Animal dog = new Dog("Rocky", "Golden Retriever");
23        System.out.println(dog);
24    }
25}