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Copy pathQueueUsingLL.java
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71 lines (58 loc) · 1.34 KB
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public class QueueUsingLL {
static class Node{
int data;
Node next;
Node(int data){
this.data = data;
this.next = null;
}
}
static class Queue{
static Node head = null;
static Node tail = null;
public boolean isEmpty(){
return head == null && tail == null;
}
public void add(int data){
Node newNode = new Node(data);
if(head == null){
head = tail = newNode;
return;
}
tail.next = newNode;
tail = newNode;
}
public int remove(){
if(isEmpty()){
System.out.println("Queue is empty");
return -1;
}
int front = head.data;
if(head == tail){
head = tail = null;
}
else{
head = head.next;
}
return front;
}
public int peek(){
if(isEmpty()){
System.out.println("Queue is empty");
return -1;
}
return head.data;
}}
public static void main(String args[]){
Queue q = new Queue();
q.add(3);
q.add(34);
q.add(234);
System.out.println(q.remove());
q.add(121);
while(!q.isEmpty()){
System.out.println(q.peek());
q.remove();
}
}
}