An warware: java gwada kama integer.parseint

A cikin duniyar shirye-shirye, yana da mahimmanci a rubuta lambar da ta dace kuma tana iya magance al'amuran da ba zato ba tsammani. Ɗayan irin wannan yanayin ba zato ba tsammani ya taso lokacin da muka yi ƙoƙarin tantance ƙimar lamba daga kirtani, kuma kirtani ta ƙunshi haruffa marasa inganci. A cikin wannan labarin, za mu tattauna da gwada kama inji da kuma amfani da shi Integer.parseInt hanyar in Java.

Idan ya zo ga canza kirtani zuwa lamba, Java yana ba mu Integer.parseInt hanya. Duk da haka, wannan hanya na iya jefa a Lambar FormatException idan igiyar ta ƙunshi haruffa waɗanda basu da inganci don nau'in bayanan lamba. Anan ne tsarin gwada kamawa ya shigo cikin wasa, yana ba mu damar sarrafa keɓanta da alheri da samar da mafita mai dacewa ga matsalar.

Yin amfani da gwada-catch tare da Integer.parseInt

Tsarin kama-karya yana ba mu damar aiwatar da toshe lambar kuma mu kama duk wani keɓantacce wanda zai iya faruwa yayin aiwatar da shi. Ta hanyar naɗa lambar mu ta Integer.parseInt a cikin shingen gwada kama, za mu iya kama kowane NumberFormatException wanda za a iya jefawa, don haka ba mu damar ɗaukar matakin da ya dace dangane da ban.

Anan ga bayanin mataki-mataki na yadda ake amfani da gwada-catch tare da Integer.parseInt:

public class TryCatchExample {
    public static void main(String[] args) {
        String numberString = "123a";
        int result;

        try {
            result = Integer.parseInt(numberString);
        } catch (NumberFormatException e) {
            System.out.println("Invalid number format: " + e.getMessage());
            result = 0; // default value in case of error
        }

        System.out.println("Result: " + result);
    }
}

1. ayyana masu canjin 'numberString' da 'sakamako', inda 'numberString' ke ƙunshe da kirtan da muke son musanyawa, kuma 'sakamako' zai adana ƙimar integer da aka tantance.
2. Kewaye kiran 'Integer.parseInt' a cikin toshe gwadawa.
3. Idan a Lambar FormatException ana jefawa yayin kiran 'Integer.parseInt', kama keɓantacce a cikin shingen kama.
4. A cikin katangar kama, buga saƙon kuskure tare da cikakkun bayanai na keɓanta kuma saita ƙimar tsoho zuwa madaidaicin 'sakamako'.
5. A ƙarshe, buga ƙimar 'sakamako'.

Fahimtar NumberFormatException

A Lambar FormatException ƙaramin aji ne na RuntimeException kuma ana jefa shi lokacin da aka yi ƙoƙarin canza kirtani zuwa ɗaya daga cikin nau'ikan lambobi idan igiyar ba ta da tsari mai dacewa. A cikin lamarin Integer.parseInt, ban da za a jefa idan kirtani ta ƙunshi haruffa waɗanda ba su da ingantattun ƙimar lamba (misali, haruffa, haruffa na musamman).

• Ingantacciyar ƙimar lamba yakamata ta ƙunshi lambobi (0-9), da alamar jagorar zaɓi (+ ko -).
• Ba a yarda da haruffan farin sararin samaniya a cikin kirtani don tantancewa ba.
• Idan kirtanin ya fara da ingantaccen tsarin lamba amma yana da haruffa marasa inganci daga baya, hanyar za ta jefa NumberFormatException.

Madadin Hanyoyin Watsawa

Bayan amfani da gwada-catch tare da Integer.parseInt, Java kuma yana ba da madadin hanyoyin tantance kirtani zuwa lamba, kamar hanyar `Integer.valueOf` da Java 8's `OptionalInt` tare da qarqashinsu.

// Using Integer.valueOf
public static Integer tryParse(String value) {
    try {
        return Integer.valueOf(value);
    } catch (NumberFormatException e) {
        return null;
    }
}

// Using Java 8 OptionalInt and Stream
public static OptionalInt tryParseJava8(String value) {
    return value.chars()
        .allMatch(Character::isDigit)
        ? OptionalInt.of(Integer.parseInt(value))
        : OptionalInt.empty();
}

A ƙarshe, kulawa da keɓancewa da samar da mafita masu dacewa ga matsalolin yana da mahimmanci a cikin shirye-shirye. Hanyar kamawa don sarrafa NumberFormatException wanda Integer.parseInt ya jefa ita ce irin wannan mafita, tabbatar da cewa lambar mu ta kasance mai ƙarfi da aminci ta fuskar ƙimar shigarwar da ba zato ba tsammani.