# Learning Notes: CentOS 7 Learning Twenty: The Basis of shell Scripting

Catalog Learning Notes: CentOS 7 Learning Twenty: The Basis of shell Scripting 20.1 shell Basic Grammar 20.1.1 What is shell? 20.1.2 Programming Language Classification 20.1.3 What is shell script 20.2 SHELL Variables and Their Application 20.2.1 shell variable 20.2.2 User Defined ...

Posted on Tue, 25 Jun 2019 11:54:47 -0700 by yodasan000

JAVA Quick Start-Object-Oriented Three Characteristics-Polymorphism

Tips: Polymorphism literally means "multiple states". In object-oriented languages, many different implementations of interfaces are polymorphism. Referring to Charlie Calverts'description of polymorphism, polymorphism is a technique that allows you to set a parent object to one or more of its children as ...

Posted on Wed, 15 May 2019 16:24:45 -0700 by samip1983

Delphi's interface-based multicast listener mode (observer mode)

This article is from: http://www.cnblogs.com/hezihang/p/6083555.html. Delphi uses interface to design modules, which can reduce the coupling between modules and facilitate expansion and maintenance. This paper provides a monitor mode based on IInterface (observer mode, subscriber mode) to implement an automatic multicast. The following program ...

Posted on Wed, 20 Mar 2019 22:39:26 -0700 by tablex