An warware: auna lokacin kisa

Auna Lokacin Kisa a Java aiki ne na yau da kullun ga masu haɓakawa da yawa. Wannan yana da mahimmanci don kimanta aikin lambar ku, gano ƙulla-ƙulla, da haɓaka ingantaccen sa. Yana da mahimmanci musamman lokacin haɓaka aikace-aikace masu saurin lokaci inda aiki zai iya yin tasiri kai tsaye akan ƙwarewar mai amfani.

Yana da mahimmanci don fahimtar maɓalli na ma'aunin lokaci a Java kuma a yi amfani da ɗakunan karatu da ayyuka masu dacewa, saboda rashin amfani na iya haifar da sakamako mara kyau. Bari mu bincika yadda ake auna lokacin kisa daidai.

Fahimtar System.nanoTime da System.currentTimeMillis

Ɗaya daga cikin mafi yawan hanyoyin da ake amfani da su don auna lokacin aiwatarwa a Java ita ce ta amfani da ayyukan ajin na yanzuTimeMillis() da nanoTime() na System.

The System.currentTimeMillis() Hanyar tana dawo da lokacin na yanzu a cikin milli seconds daga Epoch (Janairu 1, 1970, 00:00:00 GMT). Yana da sauƙi don amfani amma yana da ƙananan daidaito.

long start = System.currentTimeMillis();

// your code here

long end = System.currentTimeMillis();
System.out.println("Execution time in milliseconds: " + (end - start));

A wannan bangaren, System.nanoTime() yana ba da daidaito mafi girma kuma yana auna lokacin a nanoseconds.

long start = System.nanoTime();

// your code here

long end = System.nanoTime();
System.out.println("Execution time in nanoseconds: " + (end - start));

Aiki tare da Java Time API

Wani zaɓi don auna lokacin kisa a Java yana amfani da API Time Java, ɓangaren Java 8 da sama. Wannan API yana da amfani lokacin da muke buƙatar ƙarin iko akan ƙididdiga na kwanan wata da lokaci.

Ana iya amfani da ajin kai tsaye don ɗaukar tambarin lokaci na yanzu da auna lokacin aiwatarwa.

Instant start = Instant.now();

// your code here

Instant end = Instant.now();
System.out.println("Execution time in milli seconds: " + Duration.between(start, end).toMillis());

Guava Stopwatch Utility

Laburaren Guava daga Google ya haɗa da aji mai amfani mai amfani don ayyukan lokaci mai suna Stopwatch. Yana da sauƙi kuma mai sauƙi don amfani kuma yana ba da madaidaicin ƙidayar lokaci.

Stopwatch stopwatch = Stopwatch.createStarted();

// your code here

stopwatch.stop(); // optional
System.out.println("Execution time in nanoseconds: " + stopwatch.elapsed(TimeUnit.NANOSECONDS));

Ta hanyar fahimta da amfani da waɗannan ayyuka da ɗakunan karatu, mutum zai iya auna daidai lokacin aiwatarwa da yin gyare-gyare masu dacewa don inganta aikin lamba a Java. Yana da mahimmanci a tuna cewa waɗannan hanyoyin suna ba da lokacin agogon bango ne kawai (ainihin lokacin da ya wuce), kuma ga mafi yawan madaidaicin sakamakon la'akari da abubuwa kamar lokacin CPU, sauya mahallin, tarin shara, da lokacin dumi na JVM.