Help with Creating a list based on conditions

Question

Hi, im doing a project in java at college, and this is what the project says;
Every November, on the last Wednesday of the month, Salchester Primary School holds its annual school games competition. The school is very small and pupils from all classes belong to Houses which compete for the House Cup. Each pupil belongs to either the Green or Yellow House. The names of pupils and numbers in each class are provided for you, together with their House.
The games that are played during the day are:
" Snap
" Cribbage
" Spillikins
" Junior Scrabble.
The structure of the competition is as follows:
" the Yellow and Green Houses compete against each other in a series of
matches
" each match is best of three single games of one type of game
" pupils cannot play other pupils from the same class
" pupils can only play another pupil once
" each pupil will take part in one match for each type of game.
To allow results to be entered, the aim of the program is to
" prepare a list of matches for the games competition
" identify the winners of each match on the schedule
" calculate the points awarded to each House.so far i have created the following classes;
the student class which outlines all of the methods that i think are needed in the programme
public class student
    private String name;
    private int c_lass;
    private int []game;
    private int [] oponent;
public student(String n, int c)
        oponent=new int [18];
        game = new int [4];
        game[0] = -1;
        game[1] = -1;
        game [2] = -1;
        game[3] = -1;
        c_lass = c;
        name = n;
public String getName()
      return name;     
public int getC_lass()
      return c_lass;   
public int getGame(int y)
      return game [y];     
public int getOponent(int y)
      return oponent [y];     
public void changeName (String y)
      name = y;     
public void changeC_lass (int y)
      c_lass = y;     
public void changeGame (int gindex, int oponent)
     game [gindex] = oponent;      
public void eraseGame (int y)
     game [y] = -1;      
public void eraseOponent (int y)
     oponent [y] = 0;      
public void changeOponent (int y)
     oponent [y] = 1;      
  }and the student details, this class holds all of the ifnormation about the students, for example their name what colour their house is and the class number
public class studentdetails
    private student [] gh = new student [18];
    private student [] yh = new student [18];
    public studentdetails()
public void createstudentdetails ()
        //Class 1 Green house
    gh[0]=new student("Arnold",1);
    gh[1]=new student("Bertha",1);
    gh[2]=new student("Bella",1);
        //Class 2 Green house
    gh[3]=new student("Charles",2);
    gh[4]=new student("Denise",2);
        //Class 3 Green house
    gh[5]=new student("Edward",3);
    gh[6]=new student("Earl",3);
    gh[7]=new student("Freeda",3);
        //Class 4 Green house   
    gh[8]=new student("Genorge",4);
    gh[9]=new student("Gerry",4);
    gh[10]=new student("Hrriet",4);
    gh[11]=new student("Helen",4);
         //Class 5 Green house
    gh[12]=new student("Ian",5);
    gh[13]=new student("Issac",5);
    gh[14]=new student("Gerry",5);
        //Class 6 Green house
    gh[15]=new student("Keith",6); 
    gh[16]=new student("Kevin",6);
    gh[17]=new student("Leila",6);
        //Class 1 Yellow house
    yh[0]=new student("Albert",1);
    yh[1]=new student("Aswan",1);
    yh[2]=new student("Betty",1);
        //Class 2 Yellow house
    yh[3]=new student("Colin",2);
    yh[4]=new student("Debra",2);
        //Class 3 Yellow house
    yh[5]=new student("Elias",3);
    yh[6]=new student("Felicity",3);
    yh[7]=new student("Fiona",3);
        //Class 4 Yellow house
    yh[8]=new student("Gilbert",4);
    yh[9]=new student("Gwyn",4);
    yh[10]=new student("Hebe",4);
    yh[11]=new student("Hillary",4);
        //Class 5 Yellow house
    yh[12]=new student("Idris",5);
    yh[13]=new student("Jane",5);
    yh[14]=new student("Jasmine",5);
        //Class 6 Yellow house
    yh[15]=new student("Kenny",1);
    yh[16]=new student("Laura",2);
    yh[17]=new student("Linda",3);
public void printstudentdetails()
for(int i=0;i<18;i++)
        System.out.println (gh .getName () + " Class " + gh [i].getC_lass() + " Green House" );
System.out.println (yh [i].getName () + " Class " + yh [i].getC_lass() + " Yellow House" );
the problem is now in creating the match list. The match list is really hard and so far ive done the following but i cant get it to work, could anyone point me in the right direction.public class ListOfMatch
private studentdetails SB=new studentdetails();
public ListOfMatch()
public void CreateMatch()
SB.createstudentdetails();
for (int g=0;g<1;g++){
for (int i=0;i<18;i++){
if (SB.getsy (i).getGame(g)==-1){
for(int j=0;j<18;j++){
if (SB.getsy(i).getC_lass()!=SB.getsg(j).getC_lass()){
SB.getsy(i).changeGame(g,j);
SB.getsg(j).changeGame(g,i);
SB.getsy(i).changeOponent(j);
SB.getsg(j).changeOponent(i);
System.out.println(SB.getyh(i).getName()+SB.getgh(j).getName());

Answer 1

IMO you are doing it wrong and not really OO
Also please use Standard Java Coding Conventions ( and try use correct spelling)
You should declare a Game class, a House class a classGroup class and a Student class
To create the matchups you then can pick student from each classGroup.