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What is @ModelAttribute in Spring MVC?
...ring managed model. If the named bean is not found, instead of throwing an error or returning null, it implicitly takes on the role of @Bean i.e. Create a new instance using the default constructor and add the bean to the model.
For method annotations, think of @ModelAttribute as the equivalent of ...
Java Generics (Wildcards)
...
List<? extends Number> nums = ints;
nums.add(3.14); // compile-time error
assert ints.toString().equals("[1, 2, 3.14]");
To put elements into the structure we need another kind of wildcard called Wildcards with super,
List<Object> objs = Arrays.<Object>asList(2, 3.14, "four"...
Is it possible to include a file in your .gitconfig
...g to be loaded.
If git can't find the target file, it silently ignores the error. This appears to be by design.
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How to copy an object in Objective-C
...
I got an error: No visible @interface for 'NSObject' declares the selector 'copyWithZone:'. I guess this is only required when we are inheriting from some other custom class that implements copyWithZone
– Sam
...
Shall we always use [unowned self] inside closure in Swift
... here
networkManager.fetch(query: query) { [weak self] (results, error) in
self?.updateUI() // could be called any time after vc closes
}
}
@IBAction func buttonPress(self: Any) {
buttonPressClosure()
}
// rest of class below.
}
...
Why can't C++ be parsed with a LR(1) parser?
... but gave it
up for hand-coded parsing, I think because they wanted
better error diagnostics.
There's another approach, though, which is nice and clean
and parses C and C++ just fine without any symbol table
hackery: GLR parsers.
These are full context free parsers (having effectively infinite
look...
What is the difference between __dirname and ./ in node.js?
...But when I run the same script from /home/user/ I get
{ hello: 'world' }
Error: ENOENT, no such file or directory './files/somefile.txt'
at Object.openSync (fs.js:228:18)
at Object.readFileSync (fs.js:119:15)
at Object.<anonymous> (/home/user/dir/dir.js:4:16)
at Module._compi...
What's the use of Jade or Handlebars when writing AngularJs apps
...hing like:
.control-group(
ng-form
name='emailGroup'
ng-class='{"ng-error": emailGroup.$invalid}'
)
label.control-label Email
.controls
input(
type='email'
ng-model='user.email'
required
placeholder='you@example.com'
focus-on='focusEmail'
)
… whic...
What is the difference between up-casting and down-casting with respect to class variable
...ct but referenced to Dog which is a super class in the hierarchy it throws error since obj3 don't have access to secretId() method.In order to invoke that method you need to Downcast that obj3 manually to PoliceDog
( (PoliceDog)obj3).secretID();
which prints ID
In the similar way to invoke the do...
How do I squash two non-consecutive commits?
...ocal, you will get There is no tracking information for the current branch error when rebasing. In this case you need to specify the number of commits you want to work with, like this: git rebase -i HEAD~4. See this answer.
– johndodo
May 16 '18 at 10:55
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