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GeezerVison is showing github.com — Java/DataStructures/Stacks/StackOfLinkedList.java at master · xfbxag/Java

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StackOfLinkedList.java

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package DataStructures.Stacks;
/**
* @author Varun Upadhyay (https://github.com/varunu28)
*/
// An implementation of a Stack using a Linked List
class StackOfLinkedList {
public static void main(String[] args) {
LinkedListStack stack = new LinkedListStack();
stack.push(1);
stack.push(2);
stack.push(3);
stack.push(4);
stack.push(5);
stack.printStack();
System.out.println("Size of stack currently is: " + stack.getSize());
stack.pop();
stack.pop();
System.out.println("Top element of stack currently is: " + stack.peek());
}
}
// A node class
class Node {
public int data;
public Node next;
public Node(int data) {
this.data = data;
this.next = null;
}
}
/**
* A class which implements a stack using a linked list
* <p>
* Contains all the stack methods : push, pop, printStack, isEmpty
**/
class LinkedListStack {
Node head = null;
public void push(int x) {
Node n = new Node(x);
if (head == null) {
head = n;
} else {
Node temp = head;
n.next = temp;
head = n;
}
}
public void pop() {
if (head == null) {
System.out.println("Empty stack. Nothing to pop");
}
Node temp = head;
head = head.next;
System.out.println("Popped element is: " + temp.data);
}
public int peek() {
if (head == null) {
return -1;
}
return head.data;
}
public void printStack() {
Node temp = head;
System.out.println("Stack is printed as below: ");
while (temp != null) {
if (temp.next == null) {
System.out.print(temp.data);
} else {
System.out.print(temp.data + " -> ");
}
temp = temp.next;
}
System.out.println();
}
public boolean isEmpty() {
return head == null;
}
public int getSize() {
if (head == null)
return 0;
else {
int size = 1;
Node temp = head;
while (temp.next != null) {
temp = temp.next;
size++;
}
return size;
}
}
}
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