Add Javadoc for Java apis

[ray6080]

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (0448e00) 91.08% compared to head (89d293b) 91.12%.

❗ Current head 89d293b differs from pull request most recent head 97004c9. Consider uploading reports for the commit 97004c9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1785      +/-   ##
==========================================
+ Coverage   91.08%   91.12%   +0.04%     
==========================================
  Files         773      776       +3     
  Lines       28312    28373      +61     
==========================================
+ Hits        25789    25856      +67     
+ Misses       2523     2517       -6     

see 19 files with indirect coverage changes

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