I’m using Eclipse to generate .equals() and .hashCode(), and there is an option labeled “Use ‘instanceof’ to compare types”. The default is for this option to be unchecked and use .getClass() to compare types. Is there any reason I should prefer .getClass() over instanceof? Without using instanceof: if (obj == null) return false; if (getClass() … Read more
I want my Food class to be able to test whenever it is equal to another instance of Food. I will later use it against a List, and I want to use its List.Contains() method. Should I implement IEquatable<Food> or just override Object.Equals()? From MSDN: This method determines equality by using the default equality comparer, … Read more
This question already has answers here: How can I compare numbers in Bash? (9 answers) Closed 3 years ago. I have a bash variable depth and I would like to test if it equals 0. In case yes, I want to stop executing of script. So far I have: zero=0; if [ $depth -eq $zero … Read more
This question already has answers here: Comparing two collections for equality irrespective of the order of items in them (20 answers) Closed 4 years ago. Yet another list-comparing question. List<MyType> list1; List<MyType> list2; I need to check that they both have the same elements, regardless of their position within the list. Each MyType object may … Read more
How do we decide on the best implementation of hashCode() method for a collection (assuming that equals method has been overridden correctly) ? 20 Answers 20
When using SQL, are there any benefits of using = in a WHERE clause instead of LIKE? Without any special operators, LIKE and = are the same, right? 16 Answers 16
This question already has answers here: C# difference between == and Equals() (19 answers) Closed 8 years ago. The community reviewed whether to reopen this question 7 months ago and left it closed: Original close reason(s) were not resolved I recently was introduced to a large codebase and noticed all string comparisons are done using … Read more
This question already has an answer here: What is difference between different string compare methods [duplicate] (1 answer) Closed 2 years ago. Which of the following two is more efficient? (Or maybe is there a third option that’s better still?) string val = “AStringValue”; if (val.Equals(“astringvalue”, StringComparison.InvariantCultureIgnoreCase)) OR if (val.ToLowerCase() == “astringvalue”) ? 8 Answers … Read more
Why doesn’t Set provide an operation to get an element that equals another element? Set<Foo> set = …; … Foo foo = new Foo(1, 2, 3); Foo bar = set.get(foo); // get the Foo element from the Set that equals foo I can ask whether the Set contains an element equal to bar, so why … Read more
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 8 years ago. Improve this question I’ve been working with JPA (implementation Hibernate) for some time now and each time I need … Read more
