LinkedListで

import java.util.LinkedList;
/*
 *  LinkedList Stack
 */
public class MyStack {
    private LinkedList link;
    
    public MyStack(){
        link=new LinkedList();
    }
    
    /*
     *  
     */
    public void add(Object obj){
        //addFirst(): 
        link.addFirst(obj);
        
    }
    
    /*
     *  
     */
    public Object get(){
        //removeFirst(): ， 
        return link.removeFirst();
    }
    
    /*
     *  
     */
    public boolean isEmpty(){
        return link.isEmpty();
    }

}

/*
 * MyStack 
 */
public class MyStackTest {

    public static void main(String[] args) {
        //  
        MyStack ms=new MyStack();
        
        // 
        ms.add("hello");
        ms.add("world");
        ms.add("java");
        
        while(!ms.isEmpty()){
            System.out.println(ms.get());
        }
    }
}