refact: make method default in Interface

[asmfstatoil]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 34.67%. Comparing base (b8ca880) to head (4903737).

Files	Patch %	Lines
.../java/neqsim/fluidMechanics/flowNode/FlowNode.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #950   +/-   ##
=========================================
  Coverage     34.67%   34.67%           
  Complexity     5275     5275           
=========================================
  Files           700      700           
  Lines         69619    69620    +1     
  Branches       7984     7984           
=========================================
+ Hits          24142    24143    +1     
  Misses        43995    43995           
  Partials       1482     1482           

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