Just had an exam in college. I was asked to write a program to calculate the details of tickets sold at concerts. this was the required output(which i managed to get but without using the inner class which was required so i assume i lost marks for that)

[source lang="java"]Enter the performer of conecrt 1
wham
Enter the capacity of concert 1
100
Is ticket 1 seated? Y or N
Y
Enter the performer of conecrt 2
BAM
Enter the capacity of concert 2
200
Is ticket 1 seated? Y or N
Y
Is ticket 2 seated? Y or N
Y
Is ticket 3 seated? Y or N
Y
Enter the performer of conecrt 3
Bros
Enter the capacity of concert 3
300
Is ticket 1 seated? Y or N
Y
Is ticket 2 seated? Y or N
Y
Is ticket 3 seated? Y or N
N
Concert 1 performed by: wham
€100.0, seated ticket
The total sales for this concert is: 100
Concert 2 performed by: BAM
€100.0, seated ticket
€100.0, seated ticket
€100.0, seated ticket
The total sales for this concert is: 300
Concert 3 performed by: Bros
€100.0, seated ticket
€100.0, seated ticket
€80.0, standing ticket
The total sales for this concert is: 280
The highest sales of all 3 concerts is: BAM at 300[/source]
so one part of the exam which i didn't do fully was: "Create a fillList() method that takes a reference variable of type Ticket as a parameter and adds it to the list" how would i go about passing an object of an inner class as a paramitar to a method in the outer class? i managed to manipulate the question and get the required output by not even using the inner class

here is my code

Concert class with inner class Ticket:
[source lang="java"]import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

class Concert
{
Scanner input = new Scanner(System.in);
Random generator = new Random();
private String performer;
private int cap;
private int numTickets;
private int totalSales;
ArrayList< String > tickets = new ArrayList< String > ();
public Concert(String performer, int cap)
{
this.performer = performer;
this.cap = cap;
}
public void fillList()
{
numTickets = 1+generator.nextInt(3);
for(int i=0;i<numTickets;i++)
{
System.out.println("Is ticket "+(i+1)+" seated? Y or N");
String seated1 = input.next();
char seated = seated1.charAt(0);
if(seated == 'Y')
{
String ifseated = "€100.0, seated ticket";
this.tickets.add(ifseated);
totalSales = totalSales +100;
}
else
{
String ifnotseated = "€80.0, standing ticket";
this.tickets.add(ifnotseated);
totalSales = totalSales +80;
}
}
StaticFields.caclBiggestConcert(totalSales, performer);
}
public void displayList()
{
if(StaticFields.conNumber == 0)
{
System.out.println("Concert "+1+" performed by: "+performer);
}
else if(StaticFields.conNumber == 1)
{
System.out.println("Concert "+2+" performed by: "+performer);
}
else
{
System.out.println("Concert "+3+" performed by: "+performer);
}
for(int i =0; i < tickets.size();i++)
{
System.out.print(tickets.get(i)+"\n");
}
StaticFields.conNumber++;
}
public void showTotalSales()
{
System.out.println("The total sales for this concert is: "+totalSales);
}
public class Ticket
{
private double price;
private boolean seated;
public Ticket(double price, boolean seated)
{
this.seated = seated;
if(seated == true)
{
this.price = 100;
}
else
{
this.price = 80;
}
}
}
}
[/source]
Test class:
[source lang="java"]import java.util.Scanner;
public class Test
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
Concert con[] = new Concert[3];
for(int i =0;i < con.length;i++)
{
System.out.println("Enter the performer of conecrt "+(i+1));
String name = input.next();
System.out.println("Enter the capacity of concert "+(i+1));
int cap = input.nextInt();
con = new Concert(name, cap);
con.fillList();
}
for(int i =0;i < con.length;i++)
{
con.displayList();
con.showTotalSales();
}
System.out.println("The highest sales of all 3 concerts is: "+StaticFields.highestConcert+" at "+StaticFields.highestSales);
}
}
[/source]

also had a staticfield class to handle static variables and methods

cheers guys,
D

Exams are a bitch, as it requires you to read your professor's mind.

Create a fillList() method that takes a reference variable of type Ticket as a parameter


void fillList(Ticket ticket) {
// insert ticket to your list
}


In Java, everything is passed by references except primitives (int, bool, long, float, double).

how would i go about passing an object of an inner class as a paramitar to a method in the outer class?
[/quote]

You can invoke a method in the outer class from the inner class.


class OuterClass {
public void someMethod(InnerClass ic) {
}

class InnerClass {
public void doStuff() {
someMethod(this); // OK
}
}
}


thanks a lot mate. ++ need to brush up on my inner classes

so when i'm calling the fillList() method in the test class what would i use as parameters? the parameters used in the Ticket constructor? kinda confused

thanks a lot mate!! that explains everything