Dart\u306b\u306fStopwatch\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3068\u3044\u3046\u3082\u306e\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u3046\u3068\u3001\u7c21\u5358\u306b\u30b9\u30c8\u30c3\u30d7\u30a6\u30a9\u30c3\u30c1\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002
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\nstart()\u3067\u958b\u59cb\u3001stop()\u3067\u505c\u6b62\u3001reset()\u3067\u30ea\u30bb\u30c3\u30c8\u3067\u3059\u3002start()\u304b\u3089\u306e\u7d4c\u904e\u6642\u9593\u306felapsedInMs()\u3092\u4f7f\u3046\u3068\u30df\u30ea\u79d2\u3001elapsedInUs()\u3092\u4f7f\u3046\u3068\u30de\u30a4\u30af\u30ed\u79d2\u3067\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002elapsed()\u306f\u3001frequency()\u306b\u3088\u3063\u3066\u53d6\u5f97\u3067\u304d\u308b\u5468\u6ce2\u6570\u306b\u4f9d\u5b58\u3057\u3066\u3044\u3066\u3001\u4f55\u56de\u30ab\u30a6\u30f3\u30c8\u3057\u305f\u304b\u304c\u308f\u304b\u308a\u307e\u3059\u3002reset()\u3057\u3066\u304b\u3089start()\u3057\u306a\u3051\u308c\u3070\u30010\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\r\nclass StopwatchSample {\r\n Stopwatch _watch;\r\n StopwatchSample() {\r\n _watch = new Stopwatch();\r\n }\r\n void timeMeasurement() {\r\n \/\/ start\r\n _watch.start();\r\n \/\/ busy wait for 1000[msec]\r\n while (_watch.elapsedInMs() < 1000) {}\r\n \/\/ stop\r\n _watch.stop();\r\n }\r\n void printResult() {\r\n print("""\r\nfrequency() :${_watch.frequency()} hz\r\nelapsed() :${_watch.elapsed()} clock ticks\r\nelapsedInMs():${_watch.elapsedInMs()} milliseconds\r\nelapsedInUs():${_watch.elapsedInUs()} microseconds\r\n""");\r\n }\r\n void reset() {\r\n _watch.reset();\r\n print("reset(); elapsed() :${_watch.elapsed()}");\r\n }\r\n}\r\nvoid main() {\r\n StopwatchSample app = new StopwatchSample();\r\n app.timeMeasurement();\r\n app.printResult();\r\n app.reset();\r\n}\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306e\u4f8b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
\r\nfrequency() :1000000 hz\r\nelapsed() :1000086 clock ticks\r\nelapsedInMs():1000 milliseconds\r\nelapsedInUs():1000086 microseconds\r\n\r\nreset(); elapsed() :0\r\n<\/pre>\n