Program Antrian pada java

public class Antrian{
static int ekor = -1;
static int maxEkor = 9;
public static void addQueue(String antrian[], String data)
{ if (ekor >= maxEkor)
System.out.println("Maaf, antrian penuh");
else
{ System.out.println("add Queue: "+data);
ekor++;
antrian[ekor]=data;
}
}
public static String deQueue(String antrian[])
{ String hasil="";
if (ekor<0)
hasil="Maaf, antrian kosong";
else
{ hasil = antrian[0];
antrian[0]=null;
for (int i=1;i<=ekor;i++)
{
antrian[i-1]=antrian[i];
antrian[i]=null;
}
ekor--;
}
return (hasil);
}
public static void bacaAntrian(String antrian[])
{ System.out.println("Kondisi Antrian : ");
for (int i=0;i<=maxEkor;i++)
{
if (i==ekor)
System.out.println(i+". "+ antrian[i]+" ekor");
else if (antrian[i]==null)
System.out.println(i+". ");
else
System.out.println(i+". "+antrian[i]);
}
}
public static void main(String []wawan)
{ String antrian[]=new String [10];
System.out.println("data pertama ");
addQueue (antrian, " ADITYA YUSA PRATAMA");
addQueue (antrian, "TOMMY");
addQueue (antrian, "AGUSTIRANDA");
addQueue (antrian, "MUJI SANTOSO");
addQueue (antrian, "ZULFI BAJRA");
System.out.println(" ");
bacaAntrian(antrian);
System.out.println(" ");
System.out.println("data kedua");
addQueue (antrian, " ADITYA YUSA PRATAMA");
addQueue (antrian, "TOMMY");
addQueue (antrian, "AGUSTIRANDA");
addQueue (antrian, "MUJI SANTOSO");
addQueue (antrian, "ZULFI BAJRA");
System.out.println(" ");
bacaAntrian(antrian);
System.out.println(" ");
System.out.println("data 3 ");
addQueue (antrian, " ADITYA YUSA PRATAMA");
addQueue (antrian, "TOMMY");
addQueue (antrian, "AGUSTIRANDA");
addQueue (antrian, "MUJI SANTOSO");
addQueue (antrian, "ZULFI BAJRA");
System.out.println(" ");
bacaAntrian(antrian);
System.out.println(" ");
System.out.println("Praktikum 4 ");
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println(" ");
bacaAntrian(antrian);
System.out.println(" ");
System.out.println("Praktikum 5 ");
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println("deQueue : "+deQueue (antrian));
System.out.println(" ");
bacaAntrian(antrian);
}
}
output