Allow devs to override default snippets

[JasonWThompson]

When I create a new java file, I'm able to immediately select if I want to create a class, interface, or enum. However, there does not seem to be a way to configure what said generated type looks like. Specifically for the team I work on, there's an expectation that a certain file header comment appears at the top and specific boiler plate javadoc appears before each type.

Because this isn't possible in VSCode, I often forget to put these in there manually and thus receive embarrassing comments on my code reviews about forgetting these things. 😅

In Eclipse, I could configure the template for types and files by going to Preferences->Java->Code Style->Code Templates and control what is generated. This is what I want. (This is different from Preferences->Java->Editor->Templates which is closer to VSCode snippets).

Environment

• Operating System: Windows 10
• JDK version: JDK 11
• Visual Studio Code version: 1.45.1
• Java extension version: 0.62.0

[wangchengxin]

I also want to make this suggestion, it is particularly inconvenient to use other "header" plugins, I hope developers add this feature

[fbricon]

• java.templates.fileHeader: Specifies the file header comment for new Java file. Supports configuring multi-line comments with an array of strings, and using ${variable} to reference the predefined variables.

• java.templates.typeComment: Specifies the type comment for new Java type. Supports configuring multi-line comments with an array of strings, and using ${variable} to reference the predefined variables.

Predefined variables:

• ${file_name} - name of the current Java file
• ${package_name} - name of the enclosing package
• ${type_name} - name of the current type
• ${user} - current user system login name
• ${date} - current system date
• ${time} - current system time
• ${year} - current year
• ${month} - current month
• ${day} - current day of the month
• ${hour} - current hour
• ${minute} - current minute

[fbricon]

For instance, you can define a copyright header like:

"java.templates.fileHeader": [
  "/**",
  "*  Copyright (c) ${year} Red Hat, Inc.",
  "*  All rights reserved. This program and the accompanying materials",
  "*  are made available under the terms of the Eclipse Public License v2.0",
  "*  which accompanies this distribution, and is available at",
  "*  http://www.eclipse.org/legal/epl-v20.html",
  "*",
  "* SPDX-License-Identifier: EPL-2.0",
  "*/"
],

and a new type Javadoc like:

"java.templates.typeComment": [
  "/**",
  "* ${type_name}",
  "* @author: ${user}",
  "*/"
]