```
[] ~/projects/jruby $ rvm jruby-9.2.9.0 do jruby bench/java/bench_java_method.rb 
Warming up --------------------------------------
100k ArrayList#java_method(:add)
                         1.000  i/100ms
100k StringBuffer#java_method(:append
                         1.000  i/100ms
Calculating -------------------------------------
100k ArrayList#java_method(:add)
                         11.485  (± 8.7%) i/s -     58.000  in   5.063596s
100k StringBuffer#java_method(:append
                          8.326  (± 0.0%) i/s -     42.000  in   5.050741s

[] ~/projects/jruby $ rvm jruby-9.2.10.0 do jruby bench/java/bench_java_method.rb 
Warming up --------------------------------------
100k ArrayList#java_method(:add)
                         2.000  i/100ms
100k StringBuffer#java_method(:append
                         2.000  i/100ms
Calculating -------------------------------------
100k ArrayList#java_method(:add)
                         25.252  (± 7.9%) i/s -    126.000  in   5.019336s
100k StringBuffer#java_method(:append
                         22.693  (± 4.4%) i/s -    114.000  in   5.034795s

[] ~/projects/jruby $ jruby bench/java/bench_java_method.rb 
Warming up --------------------------------------
100k ArrayList#java_method(:add)
                         2.000  i/100ms
100k StringBuffer#java_method(:append
                         2.000  i/100ms
Calculating -------------------------------------
100k ArrayList#java_method(:add)
                         39.733  (±12.6%) i/s -    194.000  in   5.001170s
100k StringBuffer#java_method(:append
                         33.728  (± 8.9%) i/s -    168.000  in   5.018574s
```