02 2021 档案

2021-02-18 java单例模式
摘要：public class SingletonObject { private static volatile SingletonObject instance; private SingletonObject() { } public static SingletonObject getInstan 阅读全文
posted @ 2021-02-18 15:03 imgax 阅读(89) 评论(0) 推荐(0)
2021-02-09 grep
摘要：查询多个词: grep -E 'abc|def' source_file 反选： grep -v abc source_file 阅读全文
posted @ 2021-02-09 11:31 imgax 阅读(48) 评论(0) 推荐(0)