Improve: Java APIを色々改善 #2244

Job	Run time
shellcheck	16s
actionlint	21s
build-and-test-java-api (windows-latest)	8m 18s
build-and-test-python-api (windows-latest)	9m 37s
build-and-test-java-api (macos-latest)	4m 27s
build-and-test-python-api (macos-latest)	4m 58s
build-and-test-java-api (ubuntu-latest)	5m 18s
build-and-test-python-api (ubuntu-latest)	3m 50s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 29s
build-windows-cpp-example	4m 23s
c-header	48s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 33s
rust-integration-test-strategy-matrix	4s
rust-lint	2m 35s
rust-unit-test	2m 45s
validate-cargo-lock	34s
rust-integration-test (windows-2019, directml)	5m 21s
rust-integration-test (macos-11)	2m 38s
rust-integration-test (ubuntu-20.04)	1m 7s
	1h 5m 22s

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