ICSE − Q & A

If Anybody has got the q.p of 2day's exam pl. share it :D :P

What's copy constructor ?

Plz point out my mistake in the prog.: 
import java.io.*;
class FruitJuice
    {
        int product_code,pack_size,product_price;
        String flavour,pac_type;
        FruitJuice()
        {
            product_code=0;
            pack_size=0;
            product_price=0;
            flavour="";
            pac_type="";
        }
        void input()throws IOException
        {
            BufferedReader inp=new BufferedReader(new InputStreamReader(System.in));
            System.out.println("Enter pcode psize pprice flavour pactype");
            product_code=Integer.parseInt(inp.readLine());
            pack_size=Integer.parseInt(inp.readLine());
            product_price=Integer.parseInt(inp.readLine());
            flavour=inp.readLine();
            pac_type=inp.readLine();
        }
        void discount()
        {
            product_price=product_price-10;
        }
        void display()
        {
            System.out.println("P code="+product_code);
            System.out.println("P size="+pack_size);
            System.out.println("P price="+product_price);
            System.out.println("Flavour="+flavour);
            System.out.println("P type="+pac_type);
        }
        public static void main(String args[])
        {
            FruitJuice ob=new FruitJuice();
            ob.input();
            ob.discount();
            ob.display();
        }
    }

Ok guys if no break statement is put in cases in switch so why does it go inside the case and execute it...I mean if the case is not matching even after mAtching case why will it print the following cases???

Dif between compiler and interpretor

diff between class n instance variable

To input strings through scanner do we write sc.next() or sc.nextLine() ??

ATB to all of you idiots XD
But the fact is the match was fixed