JAVA_模拟stack

package com.kk.Collection;

import java.util.LinkedList;
/**
 * 模拟一个栈
 * 后进先出(LIFO)
*/
public class MyStack {
private LinkedList ll=new LinkedList();
//有底的用push,没底的用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());
    }

}