Add Java 16+ improvements

[mfl28]

• Fixes Sonarlint issues since Java 17 upgrade.

Closes #16 .

[codecov]

Codecov Report

Merging #17 (f593d9b) into master (4dad184) will increase coverage by 1.00%.
The diff coverage is 82.02%.

@@             Coverage Diff              @@
##             master      #17      +/-   ##
============================================
+ Coverage     83.05%   84.05%   +1.00%     
- Complexity     1195     1213      +18     
============================================
  Files            86       86              
  Lines          5429     5301     -128     
  Branches        474      476       +2     
============================================
- Hits           4509     4456      -53     
+ Misses          676      610      -66     
+ Partials        244      235       -9     

Impacted Files	Coverage Δ
...oundingboxeditor/model/data/BoundingShapeData.java	78.94% <0.00%> (+3.94%)	⬆️
...boxeditor/model/io/BoundingBoxPredictorConfig.java	100.00% <ø> (+16.66%)	⬆️
...oxeditor/model/io/ImageAnnotationLoadStrategy.java	66.66% <ø> (ø)
...model/io/services/BoundingBoxPredictorService.java	100.00% <ø> (+34.48%)	⬆️
...odel/io/services/ImageAnnotationExportService.java	100.00% <ø> (+8.69%)	⬆️
...odel/io/services/ImageAnnotationImportService.java	100.00% <ø> (+16.66%)	⬆️
.../boundingboxeditor/ui/BoundingPolygonTreeItem.java	62.50% <0.00%> (+3.67%)	⬆️
...fl28/boundingboxeditor/ui/BoundingPolygonView.java	83.88% <0.00%> (+0.92%)	⬆️
...28/boundingboxeditor/ui/BoundingShapeViewData.java	84.90% <0.00%> (+1.26%)	⬆️
.../mfl28/boundingboxeditor/ui/EditorToolBarView.java	89.31% <ø> (ø)
... and 45 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

81.6% Coverage
0.0% Duplication