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What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?
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Class definitions:
val or var can be omitted from class parameters which will make the parameter private.
Adding var or val will cause it to be public (that is, method accessors and mutators are generated).
{} can be omitted if the class has no body, that is,
class E...
iPhone app in landscape mode, 2008 systems
Please note that this question is from 2008 and now is of only historic interest.
8 Answers
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How can the Euclidean distance be calculated with NumPy?
...s: why use this in opposite of this?stackoverflow.com/a/21986532/189411 from scipy.spatial import distance a = (1,2,3) b = (4,5,6) dst = distance.euclidean(a,b)
– Domenico Monaco
Sep 22 '17 at 8:19
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What's “P=NP?”, and why is it such a famous question? [closed]
...t is looking at a particular cell on the tape. Depending on what it reads from that cell, it can write a new symbol into that cell, move the tape one cell forward or backward, and go into a different state. This is called a state transition. Amazingly enough, by carefully constructing states and ...
What is the JUnit XML format specification that Hudson supports?
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Update 2016-11 The link is broken now. A better alternative is this page from cubic.org: JUnit XML reporting file format, where a nice effort has been taken to provide a sensible documented example. Example and xsd are copied below, but their page looks waay nicer.
sample JUnit XML file
<?x...
SparseArray vs HashMap
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//but can be copied from Android source code
In terms of memory, here is an example of SparseIntArray vs HashMap<Integer, Integer> for 1000 elements:
SparseIntArray:
class SparseIntArray {
int[] keys;
int[] values;
int si...
How to get UTC time in Python?
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Try this code that uses datetime.utcnow():
from datetime import datetime
datetime.utcnow()
For your purposes when you need to calculate an amount of time spent between two dates all that you need is to substract end and start dates. The results of such substraction ...
Get type of a generic parameter in Java with reflection
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I want to try to break down the answer from @DerMike to explain:
First, type erasure does not mean that the JDK eliminates type information at runtime. It's a method for allowing compile-time type checking and runtime type compatibility to coexist in the same la...
Why would I prefer using vector to deque
...(Thus you can have a vector underneath or a regular array and call the API from your memory block).
Where deque has its biggest advantages are:
When growing or shrinking the collection from either end
When you are dealing with very large collection sizes.
When dealing with bools and you really wa...
Is iterating ConcurrentHashMap values thread safe?
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What does it mean?
That means that each iterator you obtain from a ConcurrentHashMap is designed to be used by a single thread and should not be passed around. This includes the syntactic sugar that the for-each loop provides.
What happens if I try to iterate the map with two thre...