JAVA_アナログstack

package com.kk.Collection;

import java.util.LinkedList;
/**
 *  
 *  (LIFO)
 */
public class MyStack {
    private LinkedList ll=new LinkedList();
    // push, put
    
    public void push(Object o){
        ll.addFirst(o);
    }
    
    public Object pop(){
        return ll.removeFirst();
    }
    
    public Object peek(){
        return ll.getFirst();
    }
    
    public boolean empty(){
        return ll.isEmpty();
    }
    
    public static void main(String[] args) {
        MyStack stack=new MyStack();
        stack.push("a");
        stack.push("b");
        stack.push("c");
        
        System.out.println(stack.pop());
        System.out.println(stack.pop());
        System.out.println(stack.pop());
        System.out.println(stack.empty());
    }
    
}