formatter | 易学教程

Regex for 1 or 2 digits with one optional decimal place

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问题 I'm using: http://firstopinion.github.io/formatter.js/index.html to mask inputs. I'm looking at "patterns" option and am having trouble writing the regex expression for 1 or 2 digits with an optional decimal place. Good inputs: 2.5 12.5 .5 1 Bad inputs: .25 123.5 1.55 Thank you for any help! 回答1: ^\d{0,2}(?:\.\d)?$ \d{0,2} = 0-2 digits \.\d = decimal point followed by 1 digit (?: ... )? = optional group ^ and $ anchor it to beginning and end DEMO 来源： https://stackoverflow.com/questions

Command line for Eclipse Java formatter [duplicate]

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问题 This question already has answers here : Can the Eclipse Java formatter be used stand-alone (3 answers) Closed 5 years ago . I just wonder if there is a command line tool for eclipse java file formatter. Or if there is an ant task to execute it. In my scenario, there are 2 java formatters, one is for android formatter, the other is our internal formatter. So we have to change it between these two formatter. 回答1: Not sure what exactly you are looking for but if im guessing correctly it is

Automatically sort functions alphabetically in C++ code

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问题 I am aware of a similar question for C#. I downloaded and tried NArrange and UniversalIndentGUI but both do not sort functions of C++ code per name. Does anyone know a non-commercial tool that does this job? 回答1: Unless you're under orders to rearrange the code to conform to an arbitrary coding standard, my advice is do not do this . I've seen people do it before, and the results are not pretty. The file will look completely different after you're done, and you'll have effectively trashed all

Define a few specific date formatters as members of an enum in Java

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问题 I need to track a few formats (DateTimeFormatter objects) for repeated use in my app. ➥ How to represent these formatter objects by using a Java enum? 回答1: tl;dr Yes. FormatDateOnly.DD_MM_YYYY.getFormatter() Details Yes, you can easily store some DateTimeFormatter objects in an enum. The slick enum facility in Java is quite powerful and flexible. Basically, an enum in Java is almost a normal Java class. Your enum can have member variables to store objects internally. Your enum can have a

is there a way to re-use a Formatter object within a loop?

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问题 Is there a way to re-use a Formatter in a loop or do I simply instantiate and let the garbage collector deal with it? (This is a Java question). Note if I take instantiation out of the loop, the formatted content of previous iterations through the loop will get appended to. Formatter.flush() only seems to flush, true to its name and does not give the benefit of allowing a clean slate re-use. Example: for (...) { Formatter f = new Formatter(); f.format("%d %d\n", 1, 2); myMethod(f.toString());

Java: Why don't the PrintWriter or PrintStream classes throw exception? [duplicate]

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问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: PrintWriter and PrintStream never throw IOExceptions Maybe the question is a bit "strange". But i'm curious to know why both PrintWriter and PrintStream don't check automatically runtime exceptions , and they provides a checkError() method. Thanks to all in advance. 回答1: For PrintStream which is often writing to std out or err, these stream might have been closed or discarded but you don't want the program to

UI5: Formatter called multiple times or too soon from an XML view

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I'm using OpenUI5. Using the formatter.js , I have formatted some text in my view. But my formatter is called 3 times: When I bind the model to panel control: oPanel.setModel(oModel, "data"); both sBirthday and sFormat are undefined . After onInit() is finished and the view is rendered: sBirthday is valorized correctly and sFormat is undefined Again: both sBirthday and sFormat ara valorized correctly. Why does this happen? Is it correct? The app get an error, because the ageDescription() in the formatter, can't manage undefined values. formatter.js sap.ui.define([], function () { "use strict";

Java - How to Clear a text file without deleting it?

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问题 I am wondering what the best way to clear a file is. I know that java automatically creates a file with f = new Formatter("jibberish.txt"); s = new Scanner("jibberish.txt"); if none already exists. But what if one exists and I want to clear it every time I run the program? That is what I am wondering: to say it again how do I clear a file that already exists to just be blank? Here is what I was thinking: public void clearFile(){ //go through and do this every time in order to delete previous

Cocoa NSNumberFormatterCurrencyStyle without “$” return zero

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I have a number formatter set up to convert currency strings to decimal values. The problem is that if the text string does not have a leading dollar sign ("$"), it gets converted to 0, rather than a valid matching number. So: "$3.50" converts to 3.50 "3.50" converts to 0 Here is the code for the converter: // formatter to convert a value to and from a currency string NSNumberFormatter *currencyFormatter = [[NSNumberFormatter alloc] init]; [currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle]; [currencyFormatter setGeneratesDecimalNumbers:YES]; Am I missing something? I ran into a

is there a way to re-use a Formatter object within a loop?

阅读更多关于 is there a way to re-use a Formatter object within a loop?

Is there a way to re-use a Formatter in a loop or do I simply instantiate and let the garbage collector deal with it? (This is a Java question). Note if I take instantiation out of the loop, the formatted content of previous iterations through the loop will get appended to. Formatter.flush() only seems to flush, true to its name and does not give the benefit of allowing a clean slate re-use. Example: for (...) { Formatter f = new Formatter(); f.format("%d %d\n", 1, 2); myMethod(f.toString()); } You could use it like this: StringBuilder sb = new StringBuilder(); Formatter f = new Formatter(sb);