Single file support

[testforstephen]

User feedbacks:

• "Single file support. Some times i want to run a single file nothing else. I don't want errors from other files in the folder. There should an option ."
• I use VSCode for simple single file java programs. A simple run / debug button, which does not add everything to the classpath and tries to compile all of the other java files would be great.

[jcrben]

@testforstephen you often have tricks / workarounds - any come to mind for this? 😄

Actually I found that the Run/Debug menu works when I opened things up in a dedicated folder - switching files does run the proper file. But it wasn't working a while back so not sure what changed I was doing wrong before

I created a .vscode/tasks.json file

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "compile current file",
            "type": "shell",
            "command": "javac ${file}",
            "group": "build",
            "problemMatcher": [],
            "windows": {
                "options": {
                    "shell": {
                        "executable": "cmd.exe",
                        "args": ["/d", "/c"]
                    }
                }
            },
            "linux": {
                "options": {
                    "shell": {
                        "executable": "bash"
                    }
                }
            },
            "options": {}
        },
        {
            "label": "run current file",
            "type": "shell",
            "command": "java ${fileBasenameNoExtension}",
            "group": "build",
            "problemMatcher": [],
            "dependsOn": "compile current file",
            "windows": {
                "options": {
                    "shell": {
                        "executable": "cmd.exe",
                        "args": ["/d", "/c"]
                    }
                }
            },
            "linux": {
                "options": {
                    "shell": {
                        "executable": "bash"
                    }
                }
            },
            "options": {}
        } 
    ]
}