Question 1

1class Demo {
2    public void alpha(int n) {
3        if (n > 0) {
4            beta(n - 1);
5        }
6    }
7    public void beta(int n) {
8        if (n > 0) {
9            gamma(n - 1);
10        }
11    }
12    public void gamma(int n) {
13        if (n > 0) {
14            gamma(n - 1);
15        }
16    }
17}
18
19
20class TestStack {
21    public static void main(String[] args) {
22        Demo d = new Demo();
23        d.alpha(3);
24    }
25}

Consider the following Java program. When the call stack reaches its maximum depth, which method will be at the top of the call stack? class Demo { public void alpha(int n) { if (n > 0) { beta(n - 1); } } public void beta(int n) { if (n > 0) { gamma(n - 1); } } public void gamma(int n) { if (n > 0) { gamma(n - 1); } } } class TestStack { public static void main(String[] args) { Demo d = new Demo(); d.alpha(3); } } Consider the following Java program. public class ArraySquare { public static int[] square(int[] a){ for(int i = 0; i < a.length; i++){ a[i] = a[i] * a[i]; } return a; } public static void main(String[] args) { int[] arr = {2,3,4}; int[] b = square(arr); System.out.println(arr[1] + b[2]); } } What will the output be? Consider the code given below that searches for a `Book` in an array. Two `Book` objects are considered equal if they have the same `title` and `isbn`. The `equals` method needs to be overridden so that the search works correctly. class Book { private String title; private String isbn; //constructor to initialize the instance variables public boolean equals(Object obj) { // CODE BLOCK } } public class Test { public static void main(String[] args) { Book[] library = { new Book("Effective Java", "111"), new Book("Clean Code", "222"), new Book("Design Patterns", "333") }; Book target = new Book("Clean Code", "222"); boolean found = false; for (int i = 0; i < library.length; i++) { if (library[i].equals(target)) { found = true; break; } } if (found) System.out.println("Book Found"); else System.out.println("Book Not Found"); } } Choose the correct option to fill in place of `CODE BLOCK` so that the output is: `Book Found`