While Working on Java project in NetBeans I found one source file ended with the symbol filename.java [-/M]. My question is what [-/M] indicates? Does it functionality of Language or IDE?
You can see this in following screenshot:
It says that the file has been modified vs. what is in your source control system. For example if you are using git, see this page.
You can turn the labels off in View > Show Versioning Labels.