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public class Stack<T> {
private int size;
private Entry<T> this.head;

public Stack (){
this.head=null;
}


public int size() { 
return this.size;
} 

public void push(T Element){
Entry<T> current=new Entry<T>(Element, this.head);
this.head=current;
this.size++;
} 
public T pop(){ 
if(this.head==null){
throw new NullPointerException("Liste leer");
} 
Entry<T> current=this.head;
this.head=this.head.getnext();
this.size--;
return current.getelement;
}