queue in java

 class queue{

node front;

node rear;

class node{

int data;

node next;

node(int data){

this.data = data;

this.next = null;

}

}

void enq(int data){

System.out.println("your are adding data "+data);

node cur = new node(data);

if(front ==null && rear ==null){

front  = cur;

rear = front.next;

}

else{

if(rear == null){

front.next = cur;

rear = cur;

return;

}

rear = rear.next = cur;

}

}

void deq(){

if(front ==null &&  rear ==null){

System.out.println("queue is empty");

}

else{

System.out.println("you are deleting "+front.data);

front = front.next;

}

}

void print(){

node temp = front;

if(front == null && rear == null){

System.out.println("there is nothing to print");

}

else{

System.out.println("your data is ");

while(temp !=null){

System.out.print(temp.data+" ");

temp = temp.next;

}

System.out.println();

}

}

public static void main(String ar[]){

queue q1 = new queue();

q1.enq(90);

q1.enq(100);

q1.print();

q1.enq(777);

q1.enq(999);

q1.deq();

q1.print();

}

}