A collection framework for Java Fundamentals Enhancement Note 29: Collection code for implementing stack data structures using LinkedList (interview questions)

Source: Internet
Author: User


1. Use LinkedList to simulate the collection of stack data Structures and test:



The meaning of the title is:
Your own definition a collection class, within which the LinkedList simulation can be used, encapsulated into its own method using the LinkedList function method .






2. Code parsing:



(1) define own collection class Mystack, simulate stack data structure ( advanced post-out )


1 package cn.itcast_05;
  2 
  3 import java.util.LinkedList;
  4
  5 / **
  6 * custom stack collection
  7 *
  8 * @author Mr He
  9 * @version V1.0
10 * /
11 public class MyStack {
12 private LinkedList link;
13
14 public MyStack () {
15 link = new LinkedList ();
16}
17
18 public void add (Object obj) {// The bottom layer calls the addFirst () method of LinkedList, which is added at the starting position each time
19 link.addFirst (obj);
20}
twenty one 
22 public Object get () {// The bottom layer calls the RemoveFirst () method of LinkedList to fetch the data (pop stack). The original collection no longer contains this element.
23 // return link.getFirst ();
24 return link.removeFirst ();
25}
26
27 public boolean isEmpty () {// The bottom layer calls the LinkedList's isEmpty () method to determine whether the internal data of the collection is empty
28 return link.isEmpty ();
29}
30} 


(2) test of Mystack:


1 package cn.itcast_05;
  2 
  3 / *
  4 * MyStack test
  5 * /
  6 public class MyStackDemo {
  7 public static void main (String [] args) {
  8 // create collection object
  9 MyStack ms = new MyStack ();
10
11 // add element
12 ms.add ("hello");
13 ms.add ("world");
14 ms.add ("java");
15
16 // System.out.println (ms.get ());
17 // System.out.println (ms.get ());
18 // System.out.println (ms.get ());
19 // NoSuchElementException When the stack data structure is obtained, it is a pop-up (pop-out). The original data in the collection will be cleared one by one (last in, after-out). It is necessary to prevent the collection from being empty when traversing, and add judgment.
20 // System.out.println (ms.get ());
twenty one         
22 while (! Ms.isEmpty ()) {
23 System.out.println (ms.get ());
twenty four         }
25}
26} 


The results are as follows:





Collection Framework for Java Basics Hardening Note 29: Collection code for implementing stack data structures using LinkedList (interview questions)


Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.