Implement a simple STACK DS in java

File: Stack.java
------------------------------------------------------------------

package org.developersbrain.solutions;

class DataNode<T>{
T t;
DataNode<T> next;
DataNode(T t){
this.t=t;
}
}

public class Stack<T> {
DataNode<T> top;
Stack(){
top=null;
}

protected void push(T t){
DataNode<T> newN=new DataNode<T>(t);
if(top==null){
top=newN;
}else{
newN.next=top;
top=newN;
}
}

private DataNode<T> pop(){
if(top==null) return null;
DataNode<T> popNode=top;
top=top.next;
return popNode;
}

protected void popElement(){
DataNode<T> data=pop();
System.out.println(data.t);
}

protected void printStack(){
DataNode<T> printer=top;
while(printer!=null){
System.out.println(printer.t);
printer=printer.next;
}
}
}


File:MainClass.java
----------------------------------------------

package org.developersbrain.solutions;

public class MainClass {

public static void main(String[] args){
Stack<Integer> stckNumbers=new Stack<Integer>();
stckNumbers.push(10);
stckNumbers.push(20);
stckNumbers.push(30);
stckNumbers.push(40);
stckNumbers.push(50);
stckNumbers.push(60);
stckNumbers.push(70);
stckNumbers.push(80);

System.out.println("Stack Elements");
System.out.println("------------------------------------");
stckNumbers.printStack();

System.out.println();
System.out.println("Remove element from the Stack");
System.out.println("------------------------------------");
stckNumbers.popElement();

System.out.println();
System.out.println("Print the modified Stack");
System.out.println("------------------------------------");
stckNumbers.printStack();
}
}


Output:
----------------------

Stack Elements
------------------------------------
80
70
60
50
40
30
20
10

Remove element from the Stack
------------------------------------
80

Print the modified Stack
------------------------------------
70
60
50
40
30
20
10