tostring | 易学教程

Why do I need to override ToString?

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问题 I'm a beginner to c# programming and recently started working on a bachelors degree. What I'm trying to say is, I'm new. I have marked the place where I have the problem. The problem is that I don't understand why I need to put override in the code at all. There is 2 var of the type object (first and rest). public Pair() { first = rest = null; } public Pair(Object o) { first = o; rest = null; } public Object First() { return(first); } public Object Rest() { return(rest); } public Pair Connect

Error: toString failed Node.js buffer

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问题 Sometimes my get request to an api fails with this error message, (btw im using the request module to trigger my requests) Error: toString failed buffer.js:378 throw new Error('toString failed'); ^ Error: toString failed at Buffer.toString (buffer.js:378:11) at BufferList.toString (/home/vardha/www/abp/node_modules/bl/bl.js:155:33) at Request.<anonymous> (/home/vardha/www/abp/node_modules/request/request.js:1013:32) at emitOne (events.js:82:20) at Request.emit (events.js:169:7) at

F#: shortest way to convert a string option to a string

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问题 The objective is to convert a string option that comes out of some nicely typed computation to a plain string that can then be passed to the UI/ printf /URL/other things that just want a string and know nothing of option types. None should just become the empty string. The obvious way is to do a match or an if on the input: input |> fun s -> fun s -> match s with | Some v -> v | _ -> "" or input |> fun s -> if s.IsSome then s.Value else "" but while still being one-liners, these still take up

Add an empty string vs toString - why is it bad?

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问题 According to the tool PMD, the following is a bad practice: String s = "" + 123; // bad String t = Integer.toString(456); // ok This is an inefficient way to convert any type to a `String`. Why is it a bad thing to do? 回答1: String s = "" + 123; // bad String t = Integer.toString(456); Will be compiled to: String s = "123"; String t = Integer.toString(456); so: "" +123 is obvious slightly better! Checked with JAD public static void main(String args[]) { // 0 0:ldc1 #16 <String "123"> // 1 2

Format decimal as currency based on currency code

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问题 I have a table of charges with the amount, and the currency code (USD, JPY, CAD, EUR etc.), and am looking for the easiest way to properly format the currency. Using my local culture code (USA) and taking my decimal.ToString("c") gets me $0.00 output, but I'd like the correct currency sign and number of decimals based on the code. Do any libraries exist for this? I can of course write up a switch statement and custom rules for each one, but thought this must have been done before. Update: I

TypeScript override ToString() [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 months ago . Let's say I have a class Person which looks like this: class Person { constructor( public firstName: string, public lastName: string, public age: number ) {} } Is it possible to override the toString() method in this class, so I could do something like the following? function alertMessage(message: string) {

Dynamic override of ToString() using Reflection

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问题 I generally override the ToString() method to output the property names and the values associated to them. I got a bit tired of writing these by hand so I'm looking for a dynamic solution. Main: TestingClass tc = new TestingClass() { Prop1 = "blah1", Prop2 = "blah2" }; Console.WriteLine(tc.ToString()); Console.ReadLine(); TestingClass: public class TestingClass { public string Prop1 { get; set; }//properties public string Prop2 { get; set; } public void Method1(string a) { }//method public

Does valueOf always override toString in javascript?

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问题 Is there any expression where by an object's toString method is implicitly called overriding its valueOf method? In the examples below, valueOf is always called implicitly (overriding toString). "4" + { toString: function () { return "4"; }, valueOf: function () { return 6; } }; // => "46", was expecting "44" 4 + { toString: function () { return "6"; }, valueOf: function () { return 4; } }; // => 8 4 + { toString: function () { return 6; }, valueOf: function() { return "4"; } }; // => "44" i

Lombok的用法

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　　Lombok是一款Java开发插件，使得Java开发者可以通过其定义的一些注解来消除业务工程中冗长和繁琐的代码，尤其对于简单的Java模型对象（POJO）。在开发环境中使用Lombok插件后，Java开发人员可以节省出重复构建，诸如hashCode和equals这样的方法以及各种业务对象模型的accessor和ToString等方法的大量时间。对于这些方法，它能够在编译源代码期间自动帮我们生成这些方法，并没有如反射那样降低程序的性能。　需要在IDEA中安装Lombok插件 maven项目在 pom.xml中添加依赖 <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.8</version> </dependency> @Data注解：在JavaBean或类JavaBean中使用，这个注解包含范围最广，它包含getter、setter、equals、canEqual、hashCode、toString 注解，即当使用当前注解时，会自动生成包含的所有方法； @getter注解：在JavaBean或类JavaBean中使用，使用此注解会生成对应的getter方法； @setter注解：在JavaBean或类JavaBean中使用

need help converting numbers to word in Java

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问题 I'm working on a program that converts numbers to words, but I'm having problems with the toString() method in the Numbers class. All the methods were given to me, so I could implement; therefore, I can't remove any of them... number: 4564 --> four thousand and five hundred and sixty four here's the code Numbers class package numberstowords; import java.util.*; public class Numbers { //array containing single digits words numbers:0-9 private final String[] SINGLE_DIGITS_WORDS; //array

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