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LinkedListStack.java
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LinkedListStack.java
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package SummerTrainingGFG.Stack;
/**
* @author Vishal Singh
*/
public class LinkedListStack {
static class Node{
int data;
Node next;
Node(int data){
this.data = data;
}
}
static class List{
Node head;
void insertEnd(int data){
Node temp = new Node(data);
temp.next = head;
head = temp;
}
int pop(){
if(head == null){
return -1;
}
int data = head.data;
head = head.next;
return data;
}
void print(){
Node temp = head;
while(temp != null){
System.out.print(temp.data+" ");
temp = temp.next;
}
System.out.println("");
}
}
static class Stack {
private final List list = new List();
void push(int data){
list.insertEnd(data);
}
int pop(){
int temp = list.pop();
return temp;
}
void print(){
list.print();
}
}
public static void main(String[] args) {
Stack s = new Stack();
s.push(5);
s.push(4);
s.push(3);
s.push(31);
s.print();
System.out.println(s.pop());
System.out.println(s.pop());
System.out.println(s.pop());
System.out.println(s.pop());
s.push(1);
s.print();
}
}