enhance java Generate toString()

[gongxun0928]

[provide a description of the issue]

Environment

• Operating System:
  Mac OS Darwin bogon 17.5.0 Darwin Kernel Version 17.5.0
• JDK version:
  java version "1.8.0_151"
  Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
  Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)
• Visual Studio Code version:
  version 1.28
• Java extension version:

Steps To Reproduce

1. use MyBatis Generator generate some classes.
2. choose a field with docs comment
3. click generate toString()

Current Result

the method generated like this:
@OverRide
public String toString() {
return "{" +
" ='" + get() + "'" +
", ='" + get() + "'" +
", @mbg.generated='" + [email protected]() + "'" +
", entityId='" + getEntityId() + "'" +
"}";
}

Expected Result

@OverRide
public String toString() {
return "{" +
" entityId='" + getEntityId() + "'" +
"}";
}

Additional Informations

could it skip the docs comment？

[fbricon]

vscode-java doesn't provide a menu to generate toString() methods. This must come from another extension.
As for actually providing toString() and other methods generation, see #597.