Java End Term: 13 April 2025, Set QDD1 (January 2025 term)

1class Shared {
2    static int count = 0;
3}
4
5class Adder extends Thread {
6    public void run() {
7        for(int i=0; i<1000; i++) {
8            Shared.count++;
9        }
10    }
11}
12public class Test {
13    public static void main(String[] args) throws InterruptedException {
14        Thread t1 = new Adder();
15        Thread t2 = new Adder();
16        t1.start();
17        t2.start();
18        t1.join();
19        t2.join();
20        System.out.print(Shared.count);
21    }
22}

1class FileStorageException extends Exception {
2    public FileStorageException(String message) {
3        super(message);
4    }
5}
6class FileUploadException extends Exception {
7    public FileUploadException(String message) {
8        super(message);
9    }
10}
11class FileService {
12    public void uploadFile(String filename) throws FileUploadException {
13        try {
14            // if(do not have enough disk space to store the file)
15            throw new FileStorageException("Insufficient disk space");
16            // else upload the file
17        } catch (FileStorageException e) {
18            FileUploadException fue = new FileUploadException("Failed to upload");
19            fue.initCause(e);
20            throw fue;
21        }
22    }
23}
24public class FileApp {
25    public static void main(String[] args) {
26        FileService fileService = new FileService();
27        try {
28            fileService.uploadFile("report.pdf");
29        } catch (FileUploadException e) {
30            System.out.println(e.getMessage());
31            System.out.println("Reason: " + e.getCause().getMessage());
32        }
33    }
34}

1package creatures;
2public class Animal {
3    private String name;
4    private String habitat;
5    private int legs;
6    // Constructor to initialize instance variables
7    public String getName(String name) {
8        return name;
9    }
10    protected String getHabitat(String habitat) {
11        return habitat;
12    }
13    private int getLegs(int legs) {
14        return legs;
15    }
16    public int showLegs(int legs) {
17        return getLegs(legs);
18    }
19}

1package Animals;
2public class Test {
3    public static void main(String[] args) {
4        Animal myAnimal = new Animal();
5        System.out.println("Number of legs: " + myAnimal.showLegs(4)); // LINE 1
6        System.out.println(myAnimal.getHabitat("Forest")); // LINE 2
7        System.out.println(myAnimal.getLegs(4)); // LINE 3
8    }
9}