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How can I reliably determine the type of a variable that is declared using var at design time?
...hod bodies. That allows us to quickly build up a database of information about what namespace, types and methods (and constructors, etc) are in the source code of the program. Analyzing every single line of code in every method body would take way too long if you're trying to do it between keystrok...
Any good boolean expression simplifiers out there? [closed]
... Note that if you want the truth table, which is not always outputed for some expressions, then start the query with the words "truth table" followed by the expression
– Belgi
May 20 '17 at 13:00
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How to implement a queue using two stacks?
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Keep 2 stacks, let's call them inbox and outbox.
Enqueue:
Push the new element onto inbox
Dequeue:
If outbox is empty, refill it by popping each element from inbox and pushing it onto outbox
Pop and return the top element from outbox
Using this method, each...
Connection pooling options with JDBC: DBCP vs C3P0
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DBCP is out of date and not production grade. Some time back we conducted an in-house analysis of the two, creating a test fixture which generated load and concurrency against the two to assess their suitability under real life condi...
Get string character by index - Java
I know how to work out the index of a certain character or number in a string, but is there any predefined method I can use to give me the character at the nth position? So in the string "foo", if I asked for the character with index 0 it would return "f".
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Can I change the Android startActivity() transition animation?
...ty and would rather have a alpha fade-in for startActivity() , and a fade-out for the finish() . How can I go about this in the Android SDK?
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How is CountDownLatch used in Java Multithreading?
...duration;
}
public void run() {
try {
System.out.println(name +" Processing Something for "+ workDuration/1000 + " Seconds");
Thread.sleep(workDuration);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out...
Get the Row(s) which have the max count in groups using groupby
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In [1]: df
Out[1]:
Sp Mt Value count
0 MM1 S1 a 3
1 MM1 S1 n 2
2 MM1 S3 cb 5
3 MM2 S3 mk 8
4 MM2 S4 bg 10
5 MM2 S4 dgd 1
6 MM4 S2 rd 2
7 MM4 S2 cb 2
8...
What is the 'instanceof' operator used for in Java?
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I just tried - Object dog = new Dog(); System.out.println(dog instanceof Cat);. This compiles just fine and prints false. The compiler is not allowed to determine at compile time that dog cannot be a Cat (per the rules in the JLS)
– Erwin Bolwidt
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Creating .pem file for APNS?
...nhanced Mail Security Certificate):
openssl pkcs12 -in apns-dev-cert.p12 -out apns-dev-cert.pem -nodes -clcerts
On the server set the file permission of this unencrypted key by using chmod 400.
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