public class Packet{    private int source;    private int dest;    private int[] mincost;        public Packet(Packet p)    {        source = p.getSource();        dest = p.getDest();        mincost = new int[NetworkSimulator.NUMENTITIES];        for (int i = 0; i < NetworkSimulator.NUMENTITIES; i++)        {            mincost[i] = p.getMincost(i);        }    }        public Packet(int s, int d, int[] mc)    {        source = s;        dest = d;                mincost = new int[NetworkSimulator.NUMENTITIES];        if (mc.length != NetworkSimulator.NUMENTITIES)        {            System.out.println("Packet(): Invalid data format.");            System.exit(1);        }                for (int i = 0; i < NetworkSimulator.NUMENTITIES; i++)        {            mincost[i] = mc[i];        }    }                public int getSource()    {        return source;    }        public int getDest()    {        return dest;    }        public int getMincost(int ent)    {        return mincost[ent];    }    public String toString()    {        String str;        str = "source: " + source + "  dest: " + dest + "  mincosts: ";                for (int i = 0; i < NetworkSimulator.NUMENTITIES; i++)        {            str = str + i + "=" + getMincost(i) + " ";        }                return str;            }    }