java null and isEmpty

2021-07-24

Description: this article is talking about the difference between null and isEmpty

String s1 = new String();
String s2 = "";
String s3 = null;

s1

java assigns the storage but the value is null, is absolute null

s2

java assigns the storage but the value is null, is relative null

s3

java does not assign the storage and without value

Views()

缺失模块。
1、请确保node版本大于6.2
2、在博客根目录（注意不是yilia根目录）执行以下命令：
npm i hexo-generator-json-content --save

3、在根目录_config.yml里添加配置：

  jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: false
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true

Keyang Wang <br><br>Monash University<br> Master of Information Technology<br>Keep !