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What is the difference between ? and Object in Java generics?
...an't safely put anything into Map<String, ?>, because you don't know what type the values are supposed to be.
You can put any object into a Map<String, Object>, because the value is known to be an Object.
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What could cause java.lang.reflect.InvocationTargetException?
Well, I've tried to understand and read what could cause it but I just can't get it:
13 Answers
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For a boolean field, what is the naming convention for its getter/setter?
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I have a boolean filed named hasCustomName, Now what should i name for it's getter and setter methods? Is setHasCustomName[setter] and hasCustomName[getter] good?
– Hadi
Jul 29 '18 at 8:50
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What's the 'Ruby way' to iterate over two arrays at once
...ing the two arrays together works well if you are dealing with arrays. But what if you are dealing with never-ending enumerators, such as something like these:
enum1 = (1..5).cycle
enum2 = (10..12).cycle
enum1.zip(enum2) fails because zip tries to evaluate all the elements and combine them. Inste...
Big-oh vs big-theta [duplicate]
... see big-theta with the occasional big-oh thrown in.
I know mathematically what the difference is between the two, but in English, in what situation would using big-oh when you mean big-theta be incorrect, or vice versa (an example algorithm would be appreciated)?
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What are DDL and DML?
...rd the terms DDL and DML in reference to databases, but I don't understand what they are.
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LINQ .Any VS .Exists - What's the difference?
Using LINQ on collections, what is the difference between the following lines of code?
6 Answers
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What is the difference between a “line feed” and a “carriage return”?
...hese two keywords then they must have their own meaning. So I want to know what makes them different and what is their code?
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What's the difference between “squash” and “fixup” in Git/Git Extension?
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I do not know what Git Extensions does with it specifically, but git rebase has an option to automatically squash or fixup commits with squash! or fixup! prefixes, respectively:
--autosquash, --no-autosquash
When the commit log ...
What is SuppressWarnings (“unchecked”) in Java?
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Sometimes Java generics just doesn't let you do what you want to, and you need to effectively tell the compiler that what you're doing really will be legal at execution time.
I usually find this a pain when I'm mocking a generic interface, but there are other examples too...