当此代码为“系统相关”时，这意味着什么？

Question

I am asking regarding this post: How to Clear Console: Java

The accepted answer is for clearing the console in Java is:

Runtime.getRuntime().exec("cls");

However, the poster mentioned that this code will be "system dependent". What does the poster mean by this?

(my rep does not allow me to comment on the post).

Answer 1

It means that the command won't work on all systems. cls is a command to clear a command window in Windows. But in Unix, for example, that's not a defined command.

$ cls
ksh: cls:  not found

That Java code depends on a cls command being available.

Answer 2

It means that the command is reliant on the current platform to support it. For example ls is a Linux/Unix command, which won't run on Windows, unless you actually have a ls program installed. Equally dir is Windows based command.

This makes the statement "System Dependent", restricting it's execution ability to a single (family) of platforms...

Answer 3

Most likely because cls is a Windows/DOS command, and wouldn't work on other operating systems.

For example, in a Windows console, you'd clear your screen like so:

C:\>cls

On, say, Unix, you'd use the clear command:

$ clear

Answer 4

It means it will only work on certain platforms. cls is a command specific to Windows platforms. The command will not work on Unix/Linux systems for example where the equivalent clear command is used to clear the screen

Answer 5

System dependent means that it won't work on some platforms. cls will only work on Windows.