3. What is the value that the following expression produces? 2+4.0/231 7. A method is implemented as follows. public double calsquare (double x ) \{ double y; y=xx; return y; What is the output that the following code fragment produces? double z= calsquare (5.0); System. out.println(z); 8. A class is implemented as follows. public class Rectangle \{ private double length; private double height; Rectangle (double 1, double h) \{ length =1; height = h; public double calArea() \{ double area; area = length*height; return area; What is the value of the variable A after the following code fragment is executed? Rectangle r= new Rectangle (2,2.5); double A=r.calArea() ; implemented as follows. lic class Item \{ private static int total=0; private int itemID; private string name; Item(String aItem)\{ name = aItem; total++; itemID = total; public int getItemID()\{ return itemID; public static int getTotal()\{ return total; What is the output that the following code fragment produces? Item item1 = new Item("Pen"); Item item2 = new Item("Phone"); System.out.println (item1.getItemID ()); System.out.println(Item.getTotal ()); 10. The set interface is a Java Collection that models the mathematical set abstraction. The following code fragment creates a set and adds several elements to it. Set fruits = new Hashset>(); fruits.add ("Apple"); fruits.add ("Orange"); fruits.add ("Apple"); fruits.add ("Banana"); fruits.add ("Kiwi"); What is the value that the following method returns? fruits.size ()