Is it possible to pass a Class as a parameter

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Java

Im not sure if its possible, but I have been trying to pass a class as a parameter. After running the code i get a native methods error , what im trying to do is pass a collection of classes and execute a specific method called execute using a stack.

import java.util.EmptyStackException;
import java.util.Stack;


public class Tree {
    Stack<Node> nodeStack = new Stack<Node>();

    public Tree(){
         nodeStack = null;
    }
    void setTasks( Node  Nodes){

        try{



            nodeStack.push(Nodes);
        }
        catch (Exception e){
            e.printStackTrace();
        }

    }
     void runTasks(){

       Node node = (Node) nodeStack.peek();
        if(nodeStack!=null){
              node.execute();


        }

        else{
            throw new EmptyStackException();
        }
    }


}

public abstract class  Node {

    public boolean condition(){
        return false;
    }


    public void execute(){

    }




}