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Why can I throw null in Java? [duplicate]
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It looks like it's not that null is treated as a NullPointerException, but that the act of attempting to throw null itself throws a NullPointerException.
In other words, throw checks that its argument is nonnull, and if it is null, it throws a NullPointerException.
JLS 14.18 ...
Which annotation should I use: @IdClass or @EmbeddedId
...ach is its ability to “hide” the use of the primary key class from the interface of the enclosing entity. The @IdClass annotation takes a value parameter of Class type, which must be the class to be used as the compound primary key. The fields that correspond to the properties of the primary key...
What is JNDI? What is its basic use? When is it used?
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What is JNDI ?
It stands for Java Naming and Directory Interface.
What is its basic use?
JNDI allows distributed applications to look up services in an abstract, resource-independent way.
When it is used?
The most common use case is to set up a database connection po...
How to access the ith column of a NumPy multidimensional array?
...access the data while test[:, [0, 2]][:, [0, 1]] does not? It seems very unintuitive that doing the same thing again has a diffrent outcome.
– mapf
Apr 27 at 7:53
add a commen...
Path.Combine for URLs?
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@Brian: if it helps, all TryXXX methods (int.TryParse, DateTime.TryParseExact) have this output param to make it easier to use them in an if-statement. Btw, you don't have to initialize the variable as Ryan did in this example.
– Abel
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Embedded MongoDB when running integration tests
...Starter.getDefaultInstance();
String bindIp = "localhost";
int port = 12345;
IMongodConfig mongodConfig = new MongodConfigBuilder()
.version(Version.Main.PRODUCTION)
.net(new Net(bindIp, port, Network.localhostIsIPv6()))
.build();
this.mongodEx...
Make body have 100% of the browser height
... Android) because it calculates viewport height without taking the toolbar into account.
– int_index
Feb 4 '19 at 10:00
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show 8 more commen...
Is there a method that works like start fragment for result?
...for communication between Fragments,
setTargetFragment(Fragment fragment, int requestCode)
getTargetFragment()
getTargetRequestCode()
You can callback using these.
Fragment invoker = getTargetFragment();
if(invoker != null) {
invoker.callPublicMethod();
}
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FileNotFoundException while getting the InputStream object from HttpURLConnection
...r using cUrl in java).
The content of the request is xml and at the end point, the application processes the xml and stores a record to the database and then sends back a response in form of xml string. The app is hosted on apache-tomcat locally.
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How can I get the source code of a Python function?
... return a
Then:
import inspect
lines = inspect.getsource(foo)
print(lines)
Returns:
def foo(arg1,arg2):
#do something with args
a = arg1 + arg2
return a
But I believe that if the function is compiled from a string, stream or imported...