Java Class

fplwriter · 21-11-2014 1:01pm #1

Hi guys,

I'm doing a World Cup Group Draw Java Program and am having trouble with it. I want to draw teams and place them into random groups. It is taxing.

Here is the code.

Java Code:
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package TheWorldCup;
//import java.util.Array;
import java.util.Random;
import java.util.Scanner;

public class WorldCup2014 {

public static void main(String args[]){

String[][] WCArray = {{"Australia", "Iran", "China", "Saudi Arabia", "USA","Mexico","Canada","Honduras", "South Africa", "Nigeria",
"Morocco", "Ghana", "Rwanda", "Brazil", "Argentina", "Colombia", "Ecuador", "Chile", "England", "Spain","Germany","France",
"Portugal","Scotland", "Republic of Ireland", "Sweden", "Italy", "Bosnia","Belguim", "Hungary", "Greece", "Bolivia" }};

String[][] WCGroup = {{"Group One", "Group Two", "Group Three", "Group Four", "Group Five",
"Group Six", "Group Seven", "Group Eight"}};

Random random = new Random();

Scanner WCTeam = new Scanner(System.in);

System.out.println("There are 8 possible groups");
System.out.println("Enter a Team to be drawn");
String Team = WCTeam.nextLine();

for(int i=0; i<7; i++){
System.out.println("Their group is:" +WCGroup );
}

// for(int j=0; j<31; j++){
// System.out.println("Team is: " + j);
// }

}
}

What if anything else do i need to do?

L.Jenkins · 21-11-2014 5:29pm

Firstly, you don't need to store the Team names and Group names in a 2d Array, you can save the output of the random group choice to a 2d Array instead and use an ordinary Array for the Names if you wish. I see you initialized the Random class but don't actually use it.

Random rn = new Random(); int answer = rn.nextInt(8) + 1;

Will do the trick as you have 8 groups.

You'll need a nested for loop or a method of traversing to
the next row in the 2d Array if your app places more than one
team in a group.

You'll definitely need the 2d Array if you want to print out the
contents of the Array.

hussey · 26-11-2014 6:19am

I don't think you really understand arrays:
e.g. String[][] WCGroup = {{"Group One", "Group Two", "Group Three", "Group Four", "Group Five",
"Group Six", "Group Seven", "Group Eight"}};
is actually a [1][8] array ... why, what do you want to achieve?
Have a think about what is it you want to achieve rather than try code first, try talking out loud and telling yourself what the program should do.
Or even better would be to take a TDD (test driven development approach) and test & build one area at a time.
e.g. 1) build a single team to be drawn and assign to group
(what is a group? an array of 4 objects? ... how many groups? 8 ... so how should your 2d array be structured)
2) draw team twice then display error
3) draw 2nd team and assign to same group
4) draw 3rd & 4 same group
5) draw 5th to same group .... what should happen?????
6) build on these test cases and introduce random assignments
....
N) your last test should be a complete test.

Java Class

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