Java泛型的Number.valueOf()实现

public static <T extends Number> T valueOf(Class<T> type, String value) {
    if (type == Byte.class) {
        return (T) Byte.valueOf(value);
    } else if (type == Short.class) {
        return (T) Short.valueOf(value);
    } else if (type == Integer.class) {
        return (T) Integer.valueOf(value);
    } else if (type == Long.class) {
        return (T) Long.valueOf(value);
    } else if (type == Float.class) {
        return (T) Float.valueOf(value);
    } else if (type == Double.class) {
        return (T) Double.valueOf(value);
    } else {
        throw new IllegalArgumentException("Unsupported number type: " + type);
    }
}