Question

여러타입의변수를 스트링타입으로 변환하려구합니다

String.format("DeltaTime: %d \n", DeltaTime);

DeltaTime 의 타입이 byte,  boolean,  short 등일경우

어떻게사용하나요?

Answer 1

그냥....%s쓰시면됩니다....

 

/*
     * Gets the formatted string according to the format token and the
     * argument.
     */
    private CharSequence transform(FormatToken token, Object argument) {
        this.formatToken = token;
        this.arg = argument;

        // There are only two format specifiers that matter: "%d" and "%s".
        // Nothing else is common in the wild. We fast-path these two to
        // avoid the heavyweight machinery needed to cope with flags, width,
        // and precision.
        if (token.isDefault()) {
            switch (token.getConversionType()) {
            case 's':
                if (arg == null) {
                    return "null";
                } else if (!(arg instanceof Formattable)) {
                    return arg.toString();
                }
                break;
            case 'd':
                boolean needLocalizedDigits = (localeData.zeroDigit != '0');
                if (out instanceof StringBuilder && !needLocalizedDigits) {
                    if (arg instanceof Integer || arg instanceof Short || arg instanceof Byte) {
                        IntegralToString.appendInt((StringBuilder) out, ((Number) arg).intValue());
                        return null;
                    } else if (arg instanceof Long) {
                        IntegralToString.appendLong((StringBuilder) out, ((Long) arg).longValue());
                        return null;
                    }
                }
                if (arg instanceof Integer || arg instanceof Long || arg instanceof Short || arg instanceof Byte) {
                    String result = arg.toString();
                    return needLocalizedDigits ? localizeDigits(result) : result;
                }
            }
        }

        formatToken.checkFlags(arg);
        CharSequence result;
        switch (token.getConversionType()) {
        case 'B': case 'b':
            result = transformFromBoolean();
            break;
        case 'H': case 'h':
            result = transformFromHashCode();
            break;
        case 'S': case 's':
            result = transformFromString();
            break;
        case 'C': case 'c':
            result = transformFromCharacter();
            break;
        case 'd': case 'o': case 'x': case 'X':
            if (arg == null || arg instanceof BigInteger) {
                result = transformFromBigInteger();
            } else {
                result = transformFromInteger();
            }
            break;
        case 'A': case 'a': case 'E': case 'e': case 'f': case 'G': case 'g':
            result = transformFromFloat();
            break;
        case '%':
            result = transformFromPercent();
            break;
        case 'n':
            result = System.lineSeparator();
            break;
        case 't': case 'T':
            result = transformFromDateTime();
            break;
        default:
            throw token.unknownFormatConversionException();
        }

        if (Character.isUpperCase(token.getConversionType())) {
            if (result != null) {
                result = result.toString().toUpperCase(locale);
            }
        }
        return result;
    }

String.Format을 실행했을때 지정된 서식에 의해서...

결과값을 가져오는부분입니다..