Programming Concepts using Java Quiz 1: 16 July 2023 (May 2023 term)

1class Book{
2    private String bName; // Book name
3    private String aName; // Author name
4
5    //Constructor to initialize instance variables
6
7    public String toString() {
8        return bName;
9    }
10    public boolean equals(Object obj) {
11        // CODE BLOCK
12    }
13}
14
15public class Test {
16    public static void main(String[] args) {
17        Book b1 = new Book("ABC", "XYZ");
18        Book b2 = new Book("ABC", "XYZ");
19        if(b1.equals(b2))
20            System.out.println(b1+", "+ b2 +" are same");
21        else
22            System.out.println(b1+", "+ b2 +" are different");
23
24    }
25}

1class Rectangle{
2    private int sides;
3    public Rectangle(int s){
4      sides = s;
5    }
6    public final void area(){
7        System.out.println("area of rectangle");
8    }
9}
10
11class Pentagon extends Rectangle {
12   public Pentagon(int n){
13     super(n);
14   }
15    public final void area(){  // LINE 1
16        System.out.println("area of pentagon");
17    }
18}
19
20public class Test{
21    public static void main(String[] args){
22        Rectangle r = new Pentagon(4);  // LINE 2
23        r.sides = 5;  // LINE 3
24        r.area();
25    }
26}