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java: HashMap not working
..."foo");
instead of:
int i = myMap.get("foo").intValue();
The implicit call to intValue() means if the key isn't found it will generate a NullPointerException, for example:
int i = myMap.get("bar"); // NullPointerException
The reason is type erasure. Unlike, say, in C# generic types aren't re...
Disable building workspace process in Eclipse
...kspace.
You can also disable it through the menu "Project / Build automatically".
But I would recommend first to check:
if a Project Clean all / Build result in the same kind of long wait (after disabling this option)
if you have (this time with building automatically activated) some validation ...
Checking whether a variable is an integer or not [duplicate]
... # do something special
Edit:
You can always convert to a float before calling this method. The three possibilities:
>>> float(5).is_integer()
True
>>> float(5.1).is_integer()
False
>>> float(5.0).is_integer()
True
Otherwise, you could check if it is an int first li...
What is the 'cls' variable used for in Python classes?
...on.
There is difference between 'self' and 'cls' used method though analogically they are at same place
def moon(self, moon_name):
self.MName = moon_name
#but here cls method its use is different
@classmethod
def moon(cls, moon_name):
instance = cls()
instance.MName = moon_name
No...
How to escape special characters in building a JSON string?
... Even the supposedly clarifying update to this answer is bad. While technically true, it is misleading to say that you "don't need" to escape ', in much the same way that it is technically true but misleading to say that legally you don't need to murder children. More correct would be to say that y...
How do I wrap a selection with an HTML tag in Visual Studio?
...<Snippet>
<Declarations>
<Literal>
<ID>selected</ID>
<ToolTip>content</ToolTip>
<Default>content</Default>
</Literal>
</Declarations>
<Code Language="html"><![CDATA[<ul>&l...
Read data from SqlDataReader
...r the firstt column on the table. I have a table with 3 columns in order: ID, Dir, Email. My command selects dir and email. Will reader.GetStrting(0) retrieve dir or ID? Are the indexes based off the table itself on SQL Server or off the query you executed to select columns from a table?
...
Read user input inside a loop
...while read -r newline; do
((i++))
read -u 1 -p "Doing $i""th file, called $newline. Write your answer and press Enter!"
echo "Processing $newline with $REPLY" # united input from two different read commands.
done <<< $(ls)
...
Database development mistakes made by application developers [closed]
...te or technical primary keys are those that have absolutely no meaning outside the system. They are invented purely for identifying the entity and are typically auto-incrementing fields (SQL Server, MySQL, others) or sequences (most notably Oracle).
In my opinion you should always use surrogate ke...
How do I bind to list of checkbox values with AngularJS?
...d to specify "checked" in the model, Angular will set the property automatically :)
– daveoncode
Jul 9 '13 at 9:46
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