enumeration

问题 A developer at work recently started using a class pattern instead of enums in places where enums would usually fit. Instead, he uses something similar to that below: internal class Suit { public static readonly Suit Hearts = new Suit(); public static readonly Suit Diamonds = new Suit(); public static readonly Suit Spades = new Suit(); public static readonly Suit Clubs = new Suit(); public static readonly Suit Joker = new Suit(); private static Suit() { } public static bool IsMatch(Suit lhs,

问题 A developer at work recently started using a class pattern instead of enums in places where enums would usually fit. Instead, he uses something similar to that below: internal class Suit { public static readonly Suit Hearts = new Suit(); public static readonly Suit Diamonds = new Suit(); public static readonly Suit Spades = new Suit(); public static readonly Suit Clubs = new Suit(); public static readonly Suit Joker = new Suit(); private static Suit() { } public static bool IsMatch(Suit lhs,

问题 The following example defines a series of port numbers starting at 3333 using iota. package main import ( "fmt" ) const ( FirstPort = iota+3333 SecondPort ThirdPort ) func main() { hostAndPort := "localhost:"+fmt.Sprint(SecondPort) fmt.Printf("%s", hostAndPort ) // Output: // localhost:3334 } When combining hostname and ports, I'd like to avoid having to wrap the port constant in fmt.Sprint and simply write, for example, "localhost:"+SecondPort . Is there a way to use iota to define the port

问题 I have an enum with values VALID and INVALID , which have a boolean property associated with them. I would like to get the enum value based on a boolean value I provide. If it is true I should get VALID , if it is false I should get INVALID . I would like to do so in a getter method like the below, based on the value of the member variable public boolean getCardValidityStatus() { return CardValidationStatus status = CardValidationStatus(this.mCardValidityStatus)); } My code: private enum

问题 I get REST output in JSON format using curl command as below Getting KEY names alone using: curl http://test.te:8080/testApp/app/version | jq '.version' | jq '. | keys' OUTPUT: "Archiver-Version", "Build-Id", "Build-Jdk", "Build-Number", "Build-Tag", "Built-By" Getting VALUES alone using: curl http://test.te.com:8080/testApp/app/version | jq '.version' | jq '.[]' OUTPUT (Note how the order of values doesn't correspond to the order of key names; e.g., the first value, "user@test.com" , is the

问题 How can I cast a value from Enum1 to Enum 2 in Java? Here is an example of what I'm trying to do : public enum Enum1 { ONE, TWO, THREE; } public enum Enum2 { FOUR, FIVE, SIX; } So I want to do something like this: Enum2 en2 = (Enum2)ONE; Is it possible and how can I do that? Thanks in advance! 回答1: You cannot cast from one enum to another, however each enum has guaranteed order, and you can easily translate one enum to another (preserving order). For example: enum E1 { ONE, TWO, THREE, } enum

问题 How can I cast a value from Enum1 to Enum 2 in Java? Here is an example of what I'm trying to do : public enum Enum1 { ONE, TWO, THREE; } public enum Enum2 { FOUR, FIVE, SIX; } So I want to do something like this: Enum2 en2 = (Enum2)ONE; Is it possible and how can I do that? Thanks in advance! 回答1: You cannot cast from one enum to another, however each enum has guaranteed order, and you can easily translate one enum to another (preserving order). For example: enum E1 { ONE, TWO, THREE, } enum

问题 I have found a bug in VBA a few months ago and was unable to find a decent workaround. The bug is really annoying as it kind of restricts a nice language feature. When using a Custom Collection Class it is quite common to want to have an enumerator so that the class can be used in a For Each loop. This can be done by adding this line: Attribute [MethodName].VB_UserMemId = -4 'The reserved DISPID_NEWENUM immediately after the function/property signature line either by: Exporting the class

问题 I have found a bug in VBA a few months ago and was unable to find a decent workaround. The bug is really annoying as it kind of restricts a nice language feature. When using a Custom Collection Class it is quite common to want to have an enumerator so that the class can be used in a For Each loop. This can be done by adding this line: Attribute [MethodName].VB_UserMemId = -4 'The reserved DISPID_NEWENUM immediately after the function/property signature line either by: Exporting the class

来源： https://stackoverflow.com/questions/60862697/convert-hashtable-back-to-string-data-in-efficient-way