how to convert a string to an array of int
string mystring= "1,2,3,4";
int myArrayOfInt=[1,2,3,4];
This code would provide you array of int:
string source = "1,2,3,4";
var stringArray = source.Split(',');
var ArrayOfInt = stringArray.Select(x => Convert.ToInt32(x)).ToArray();
int[] myArrayOfInt = mystring.Split(',').Select(n => Convert.ToInt32(n)).ToArray();
but you cannot use linq in plc so:
var arrOfStr = mystring.Split(',');
int[] myArrayOfInt = new int()[arrOfStr.Length];
for(int i = 0; i < arrOfStr.Length; i++)
{
myArrayOfInt[i] = Convert.ToInt32(arrOfStr[i]);
}
something like this?
Related
I'm trying to get more familiar with Java lambda, can do some streams and such but still a lot to learn.
Got this simple code using JSONObject and JSONArray (org.json.simple with this exact library and no other because Gson is too easy :P) is there a way to simplify the code with java lambda/streams? (I tried with no luck)
JSONArray jsonArray = (JSONArray) jsonObject.get("someData");
Iterator<JSONObject> iterator = jsonArray.iterator();
double total = 0;
while(iterator.hasNext()) {
JSONObject iteratedJson = iterator.next();
// iteratedJson.get("ip") = "101.99.99.101" example values
String ip = (String) iteratedJson.get("ip");
// Need only first octet
ip = ip.substring(0, ip.indexOf("."));
if (Integer.valueOf(ip) >= 1 && Integer.valueOf(ip) <= 100) {
// Another object inside the array object
JSONObject locationObject = (JSONObject) iteratedJson.get("location");
// Id is int but JSONObject don't let me parse int...
long locationId = (Long) locationObject.get("id");
if (locationId == 8) {
// iteratedJson.get("amount") = "$1,999.10" example values
Number number = NumberFormat.getCurrencyInstance(Locale.US).parse((String)iteratedJson.get("amount"));
// Don't need a lot of precission
total = total + number.doubleValue();
}
}
}
You can do like this:
first of all to extract data from JsonObject I've created a class. this class takes a JosonObject as an argument and extract its values as bellow.
class ExtractData {
Integer ip;
long id;
double amount;
public ExtractData(JSONObject jsonObject) {
this.ip = Integer.valueOf(jsonObject.get("ip").toString().split("\\.")[0]);
this.id = Long.parseLong(((JSONObject) jsonObject.get("location")).get("id").toString());
try {
this.amount = NumberFormat.getCurrencyInstance(Locale.US)
.parse((String) jsonObject.get("amount")).doubleValue();
} catch (ParseException e) {
this.amount = 0d;
}
}
// getter&setter
}
then you can use stream API to calculate the sum of the amount property.
jsonArray.stream()
.map(obj -> new ExtractData((JSONObject) obj))
.filter(predicate)
.mapToDouble(value -> ((ExtractData) value).getAmount())
.sum();
for simplifying I've extracted filter operation.
Predicate<ExtractData> predicate = extractData ->
extractData.getIp()>=1 && extractData.getIp()<=100 && extractData.getId() == 8;
I have the json string from MySQL database:
{"teams":[{"sport":"NFL"},{"sport":"NBA"},{"sport":"NCAA Football"},{"sport":"NCAA Men Basketball"}],"success":1}
And I need to convert this string to the following format:
final String sports[] = {"NFL", "NBA", "NCAA Football", "NCAA Men Basketball"};
Any ideas how to do this?
import org.json.*;
String jsonString = yourJsonStringFromDatabase;
JSONObject obj = new JSONObject(jsonString);
JSONArray team = obj.getJSONArray("teams");
String[] sports = new String[team.length());
for (int i = 0; i < team.length(); i++)
{
sports[i] = arr.getJSONObject(i).getString("sport");
}
I need to upload large amount of JSON data to a webservice. Whats the best way to analyse that the server received the data correctly and all data is uploaded? Please let me know if anyone has any experience in this regards. Thanks.
You can check out my project :
https://github.com/hidayetcolkusu?tab=repositories
Calculation:
ChecksumCalculator checksumCalculator = new ChecksumCalculator();
string json = #"{""Name"":""Hidayet Raşit"",""Surname"":""ÇÖLKUŞU""}";
ushort checksum = checksumCalculator.Calculate(json);
Result: 43460
Comparing:
ChecksumCalculator checksumCalculator = new ChecksumCalculator();
string json = #"{""Name"":""Hidayet Raşit"",""Surname"":""ÇÖLKUŞU""}";
bool result = checksumCalculator.Compare(json, 43460);
Resut:true
Or
ChecksumCalculator checksumCalculator = new ChecksumCalculator();
string json = #"{""Name"":""Hidayet Raşit"",""Surname"":""ÇÖLKUŞU"",""Checksum"":43460}";
bool result = checksumCalculator.Compare(json);
Result:true
You can calculate json's hash value like this:
var sha1 = System.Security.Cryptography.SHA1.Create();
byte[] buf = System.Text.Encoding.UTF8.GetBytes(jsonString);
byte[] hash= sha1.ComputeHash(buf, 0, buf.Length);
var hashstr = System.BitConverter.ToString(hash).Replace("-", "");
You can calculate md5 to compare two json.
public static string CreateMD5(string json)
{
// Use json string to calculate MD5 hash
using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
{
byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(json);
byte[] hashBytes = md5.ComputeHash(inputBytes);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
{
sb.Append(hashBytes[i].ToString("X2"));
}
return sb.ToString();
}
}
Is it possible to make the LINQ SELECT more flexible by not working with properties but with the column name?
Maybe an example will help..I'm trying to do the following (pseudocode):
From x In Entities
Where ...
Select("ID", "Value" , "Date")
but depending on certain choices, I would like to have the result in different order
From x In Entities
Where ...
Select("Value", "Date", "ID" )
Or another amount of SELECT results
From x In Entities
Where ...
Select("Value")
Any help to make this as dynamic as possible would be AWESOME! tnx
Maybe this will help you
from x In Entities
where ... select new {
Value = x["Value"],
Date = x["Date"],
ID = x["ID"]
}
Like I said in my comment (handles subproperties, like Type.Name, but not multiple fields)
I let the fun to make the multi field version ;)
public static class DynamicLinkExtensions
{
public static IEnumerable<dynamic> Select<T>(this IQueryable<T> source, string memberAccess)
{
var propNames = memberAccess.Split('.');
var type = typeof(T);
var props = new List<PropertyInfo>();
foreach (var propName in propNames)
{
var prop = type.GetProperty(propName);
props.Add(prop);
type = prop.PropertyType;
}
return source.Select(props.ToArray());
}
public static IEnumerable<dynamic> Select<T>(this IQueryable<T> source, PropertyInfo[] props)
{
var parameter = Expression.Parameter(typeof(T));
var member = Expression.MakeMemberAccess(parameter, (MemberInfo)props.First());
for (var i = 1; i < props.Length; i++)
{
member = Expression.MakeMemberAccess(member, (MemberInfo)props[i]);
}
Expression<Func<T, object>> expression = Expression.Lambda<Func<T, object>>(member, new[] { parameter });
return source.Select(expression);
}
}
Usage:
var names = DataContext.Customers.Select("Name").Cast<string>().ToList();
I'm looking for fast string concatenation class or so in Flex.
Like StringBuilder in Java.
Thanks
var str1:String = "Vinoth";
var str2:String = "Babu";
var str3:String = "Chennai";
var str4:String = concat(str1, " ", str2, " ", str3)
trace(str4) would result you
str4 == "Vinoth babu Chennai"
String Concat Class
public class StringBuffer
{
public var buffer:Array = new Array();
public function add(str:String):void
{
for (var i:Number = 0; i < str.length; i++)
{
buffer.push(str.charCodeAt(i));
}
}
public function toString():String
{
return String.fromCharCode.apply(this, buffer);
}
}
Here you have a more indepth than the above class written.
http://blogs.adobe.com/pfarland/2007/10/avoiding_string_concatenation.html
You can create an array of strings and then use String.concat to combine them.
However, I've never seen string manipulation come up as a bottleneck when profiling a Flex app. I have in .NET, but not Flex.