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GeezerVison is showing github.com — Java/Data Structures/Stacks/StackOfLinkedList.java at master · lisaem/Java

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StackOfLinkedList.java

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/**
*
* @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.printStack();
System.out.println("Size of stack currently is: " + stack.getSize());
stack.pop();
stack.pop();
}
}
// 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
*
* Contains all the stack methods : push, pop, printStack, isEmpty
**/
class LinkedListStack {
Node head = null;
int size = 0;
public void push(int x) {
Node n = new Node(x);
if (getSize() == 0) {
head = n;
}
else {
Node temp = head;
n.next = temp;
head = n;
}
size++;
}
public void pop() {
if (getSize() == 0) {
System.out.println("Empty stack. Nothing to pop");
}
Node temp = head;
head = head.next;
size--;
System.out.println("Popped element is: " + temp.data);
}
public void printStack() {
Node temp = head;
System.out.println("Stack is printed as below: ");
while (temp != null) {
System.out.print(temp.data + " ");
temp = temp.next;
}
System.out.println();
}
public boolean isEmpty() {
return getSize() == 0;
}
public int getSize() {
return size;
}
}
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