QUEUE USING ARRAY IN JAVA

/*

TOPIC:QUEUE USING ARRAY.
DATE:2/8/2012
*/
import java.io.*;
class Queue
{
int items[]=new int[10];
int front,rear;
Queue()
{
front=0;
rear=-1;
}
void insert(int item)
{if(rear==9)
System.out.println("QUEUE overflow");
else
items[++rear]=item;
}

int remove()
{
if(this.isEmpty())
{
System.out.println("QUEUE underflow");
return 0;
}
else
{return items[front++];
}
}
boolean isEmpty()
{
if(front>rear)
return true;
else
return false;
}
}

class x
{
public static void main(String args[]) throws IOException
{
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
int ch;
Queue q=new Queue();

do
{
System.out.println("MENU");
System.out.println("1.INSERT");
System.out.println("2.REMOVE");
System.out.println("3.CHECK");
System.out.println("4.DISPLAY");
System.out.println("5.EXIT");
System.out.println("ENTER CHOICE");
ch=Integer.parseInt(br.readLine());
switch (ch)
{
case 1:
int x;
System.out.println("enter no to be inserted");
x=Integer.parseInt(br.readLine());
q.insert(x);
break;


case 2:
System.out.println("REMOVED NUMBER IS "+(q.remove()));
break;

case 3:
System.out.println("EMPTY:  "+(q.isEmpty()));
break;

case 4:
for(int i=q.front;i<=q.rear;i++)
System.out.print(q.items[i]+" ");
break;

case 5:

break;
}
}while(ch!=5);
}
}
/*
OUTPUT:
bash-3.00$ java x
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
1
enter no to be inserted
25
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
1
enter no to be inserted
96
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
1
enter no to be inserted
0224
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
1
enter no to be inserted
66
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
3
EMPTY:  false
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
4
25      96      224     66      MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
2
REMOVED NUMBER IS 25
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
2
REMOVED NUMBER IS 96
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
2
REMOVED NUMBER IS 224
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
2
REMOVED NUMBER IS 66
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
2
QUEUE underflow
REMOVED NUMBER IS 0
MENU
1.INSERT
2.REMOVE
3.CHECK
4.DISPLAY
5.EXIT
ENTER CHOICE
5

*/