Main Code Circular Queue

import java.util.Scanner;
class tes{
public static void main(String [] ags){
Scanner in=new Scanner(System.in);
Scanner ni=new Scanner(System.in);
int input;
String isi;
boolean loop=true,loop0=true;

System.out.println("Jumlah isi:");
input=in.nextInt();
System.out.println("");
MyCircularQue coba=new MyCircularQue(input);

do{
System.out.println("Isi:");
isi=ni.nextLine();
if(isi.equals("end")){
loop=false;
}
else if(isi.matches("([-0-9]*)")){
input=Integer.parseInt(isi);
coba.insert(input);
}
else{
System.out.println("Input Salah");
}
}while(loop);
System.out.println("");
do{
System.out.println("Remove :");
isi=ni.nextLine();
if(isi.equals("tidak")){
loop0=false;
}
else if(isi.equals("ya")){
System.out.println(coba.remove());
}
else{
System.out.println("Input Salah");
}
}while(loop0);
}
}