There’s little difference. Use the one that’s shorter and works more often. If you actually want to get the string value of an object for other reasons, and want it to be null friendly, do this: String s = String.valueOf(obj); Edit: The question was extended, so I’ll extend my answer. In both cases, they compile … Read more
Extension methods are only checked if there are no applicable candidate methods that match. In the case of a call to ToString() there will always be an applicable candidate method, namely, the ToString() on object. The purpose of extension methods is to extend the set of methods available on a type, not to override existing … Read more
You can’t do it directly. There are a number of ways to do it: Use a std::stringstream: std::ostringstream s; s << “(” << c1 << “, ” << c2 << “)”; storedCorrect[count] = s.str() Use boost::lexical_cast: storedCorrect[count] = “(” + boost::lexical_cast<std::string>(c1) + “, ” + boost::lexical_cast<std::string>(c2) + “)”; Use std::snprintf: char buffer[256]; // make sure … Read more
Pretty easy to just do it yourself: public class Test { public static void main(String args[]){ int[] i = fromString(Arrays.toString(new int[] { 1, 2, 3} )); } private static int[] fromString(String string) { String[] strings = string.replace(“[“, “”).replace(“]”, “”).split(“, “); int result[] = new int[strings.length]; for (int i = 0; i < result.length; i++) { … Read more
I found the bug. .NET does the following in clr\src\vm\comnumber.cpp: DoubleToNumber(value, DOUBLE_PRECISION, &number); if (number.scale == (int) SCALE_NAN) { gc.refRetVal = gc.numfmt->sNaN; goto lExit; } if (number.scale == SCALE_INF) { gc.refRetVal = (number.sign? gc.numfmt->sNegativeInfinity: gc.numfmt->sPositiveInfinity); goto lExit; } NumberToDouble(&number, &dTest); if (dTest == value) { gc.refRetVal = NumberToString(&number, ‘G’, DOUBLE_PRECISION, gc.numfmt); goto lExit; } DoubleToNumber(value, … Read more
Apache commons-lang ReflectionToStringBuilder does this for you. import org.apache.commons.lang3.builder.ReflectionToStringBuilder // your code goes here public String toString() { return ReflectionToStringBuilder.toString(this); }
You can try out this code. Since you cannot override valueOf method you have to define a custom method (getEnum in the sample code below) which returns the value that you need and change your client to use this method instead. public enum RandomEnum { StartHere(“Start Here”), StopHere(“Stop Here”); private String value; RandomEnum(String value) { … Read more
You could try XStream. XStream xstream = new XStream(new Sun14ReflectionProvider( new FieldDictionary(new ImmutableFieldKeySorter())), new DomDriver(“utf-8”)); System.out.println(xstream.toXML(new Outer())); prints out: <foo.ToString_-Outer> <intValue>5</intValue> <innerValue> <stringValue>foo</stringValue> </innerValue> </foo.ToString_-Outer> You could also output in JSON And be careful of circular references 😉
I think you can use a little reflection here. Take a look at Type.GetProperties(). public override string ToString() { return GetType().GetProperties() .Select(info => (info.Name, Value: info.GetValue(this, null) ?? “(null)”)) .Aggregate( new StringBuilder(), (sb, pair) => sb.AppendLine($”{pair.Name}: {pair.Value}”), sb => sb.ToString()); }
You can do this easily with a custom JsonConverter: public class ToStringJsonConverter : JsonConverter { public override bool CanConvert(Type objectType) { return true; } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { writer.WriteValue(value.ToString()); } public override bool CanRead { get { return false; } } public override object ReadJson(JsonReader reader, Type objectType, object … Read more