Bag class had two member variables one was called size (int type) and the other
ID: 3800336 • Letter: B
Question
Bag class had two member variables one was called size (int type) and the other was item (type T). You must modify that class to have four member variables called size, item1, item2 and item3. The add method needs to be modified as well. If size is zero, item1 should refer to the item and size needs to be incremented. On the other hand if size is one, item2 should refer to the item and size needs to be incremented. Finally if size is 3, a message should be displayed by the add method saying the bag is full.
You must also write a toString method and test all the methods of the class. The interface must be written as well and main should implement that interface.
Bag Interface java x 2 public interface Bag Interface f 3 public void display() 4 public void ad (T it);Explanation / Answer
HI, Please find my implementation.
Please let me know in case of any issue.
public class Bag<T> implements BagInterface<T> {
private int size;
private T item1, item2, item3;
public Bag() {
size = 0;
}
@Override
public void display() {
if(size == 0)
System.out.println("Empty Bag");
else if(size == 1)
System.out.println(item1);
else if(size == 2){
System.out.println(item1);
System.out.println(item2);
}else{
System.out.println(item1);
System.out.println(item2);
System.out.println(item3);
}
}
@Override
public void add(T t) {
if(size == 3){
System.out.println("Bag is full");
return;
}
if(size == 0){
item1 = t;
}else if(size == 1){
item2 = t;
}else{
item3 = t;
}
size++;
}
@Override
public String toString() {
String result = "";
if(size == 0)
result = "Bag is empty";
else if(size == 1)
result = "Item1: "+item1;
else if(size == 2){
result = "Item1: "+item1+", Item2: "+item2;
}else{
result = "Item1: "+item1+", Item2: "+item2+", and Item3: "+item3;
}
return result;
}
public static void main(String[] args) {
// Ceating object
BagInterface<Integer> bag = new Bag<>();
System.out.println(bag);
bag.add(4);
System.out.println(bag);
bag.add(2);
System.out.println(bag);
bag.add(1);
System.out.println(bag);
bag.add(9);
System.out.println(bag);
}
}
/*
Sample run:
Bag is empty
Item1: 4
Item1: 4, Item2: 2
Item1: 4, Item2: 2, and Item3: 1
Bag is full
Item1: 4, Item2: 2, and Item3: 1
*/
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