comparison

问题 As per title, what practise for string comparisons do you use and why? 回答1: You haven't specified a platform, but I'm guessing .NET. I would strongly suggest you use the latter form - because case comparisons aren't as simple as you might expect. (It also avoids creating extra strings, but that's a different matter.) For example, what do you want your code to do when presented with "mail" and "MAIL" when it's running in Turkey? If you use ToLower it will return false, and likewise if you use

问题 Utilities.getDistance(uni, enemyuni) <= uni.getAttackRange() Utilities.getDistance returns double and getAttackRange returns int. The above code is part of an if statement and it needs to be true. So is the comparison valid? Thanks 回答1: Yes, it's valid - it will promote the int to a double before performing the comparison. See JLS section 15.20.1 (Numerical Comparison Operators) which links to JLS section 5.6.2 (Binary Numeric Promotion). From the latter: Widening primitive conversion (§5.1.2

问题 I would like to check if a string begins with "node" e.g. "node001". Something like if [ $HOST == user* ] then echo yes fi How can I do it correctly？ I further need to combine expressions to check if HOST is either "user1" or begins with "node" if [ [[ $HOST == user1 ]] -o [[ $HOST == node* ]] ]; then echo yes fi > > > -bash: [: too many arguments How to do it correctly? 回答1: This snippet on the Advanced Bash Scripting Guide says: # The == comparison operator behaves differently within a

问题 I would like to check if a string begins with "node" e.g. "node001". Something like if [ $HOST == user* ] then echo yes fi How can I do it correctly？ I further need to combine expressions to check if HOST is either "user1" or begins with "node" if [ [[ $HOST == user1 ]] -o [[ $HOST == node* ]] ]; then echo yes fi > > > -bash: [: too many arguments How to do it correctly? 回答1: This snippet on the Advanced Bash Scripting Guide says: # The == comparison operator behaves differently within a

问题 I have a variable ranking which consists of many groups of different sizes which are all ranked. So one group might be 1-6 the next 1-4 and the next 1-52. I know want to create two variables that sum the differences between an individual and all individuals above and below him respectively. For a group of 5 individuals and individual 1 that means I want to get UP: SUM(1-1) =0 DOWN: SUM((1-5)+ (1-4)+ (1-3)+ (1-2)) = -10 回答1: Some considerable guesswork seems needed here. Summing the

问题 This is a weird requirement I have. I know even my question is quite confusing. Here is what I want to know. I've two string variables. I need to do equality comparison of the datatype of the underlying value in the string variables. For ex. string firstVariable = "123"; // It contains integer value. i.e. I can convert it to integer value string secondVariable = "string" // It contains string value. Now I need to compare whether datatype of the underlying values of these two strings are same.

问题 Can anyone please give some advice on comparing two ADAccount Objects in PowerShell (v2). Whenever I run a comparison with Compare-Object, it only shows the difference in the Distinguished name, not the differences in the fields of those accounts. Short of separately comparing $ADUser.Modified , or $ADUser.DisplayName , etc for every field I want to check, I'm at a loss. Is there a way to compare each and every field in the ADUser object across the two accounts, showing which fields are

问题 I am trying to sort the Project end times from smallest to largest values. I have created a list of custom objects called Project and am attempting to sort them based on a value returned by an accessor. I have overloaded the compare function and am receiving the error: The method sort(List, Comparator) in the type Collections is not applicable for the arguments (Project[], new Comparator(){}) The code from my main is shown below, any and all help appreciated. Collections.sort(projectList, new

问题 I have a generic dictionary of objects and want to use a custom comparer to update the value in the dictionary. myObjects contains a dictionary of objects and the value is the number of times that object exists. Note that the value may be incremented numerous times using different comparators or removed altogether. testObject is my custom object. customComparer is a dynamically changing comparer based on the type of testObject. but all comparers are of the type IEqualityComparer<MyObject>

问题 Let's say I have a due date and a reminder timespan . How do I find the ones where due date is less than current date + reminder with Hibernate 3.6 criteria queries? In other words, I want to find my Events I've displayed the reminder. The reminder is a Long marking when the reminder should be sent either days or milliseconds, whichever is easier. To summarize, my entities are following: java.util.Date Event.DueDate Long Event.Type.Reminder.Before // (in days or millis) Examples Today is 2012