Programming Concepts using Java Quiz 2: 6 August 2023 (May 2023 term)

1interface Computable{
2    void compute();
3}
4class Phone implements Computable{
5    public void compute() {
6          System.out.println("Phone compute");
7    }
8}
9class Laptop implements Computable{
10    public void compute() {
11        System.out.println("Laptop compute");
12    }
13}
14class DeviceList{
15    private Object[] cArr = {new Phone(), new Laptop()};
16    public void getCompute(){
17        for(int i = 0; i < cArr.length; i++){
18            //LINE 1
19        }
20    }
21}
22public class Test{
23    public static void main(String[] args) {
24        DeviceList dList = new DeviceList();
25        dList.getCompute();
26    }
27}

1public class Example{
2   public <T extends Comparable> void sortArray(T[] obj){
3     // Sorts obj
4   }
5   public <T> void elementDisplay(T[] arr){
6      // Displays the elements of arr
7   }
8   public <T extends Number> T sum(List<T> lst){
9      // Returns the sum of elements of lst
10   }
11}

1interface Shape{
2  public abstract int area();
3}
4class Square implements Shape, Cloneable{
5  int side;
6  public Square(int s){
7    side = s;
8  }
9  public int area(){
10    return side * side;
11  }
12  public Square clone() throws CloneNotSupportedException{
13    return (Square)super.clone();
14  }
15}
16public class Test{
17  public static void main(String[] args){
18    Square s1 = new Square(5);
19    try{
20      Square s2 = s1.clone();
21      s1.side = 3;
22      System.out.print(s1.area() + s2.area());
23    }
24    catch(CloneNotSupportedException e){
25      System.out.println("Cloning not supported");
26    }
27  }
28}