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What are the undocumented features and limitations of the Windows FINDSTR command?
..., 0x0B Vertical Tab, 0x0C Form Feed, 0x0D Carriage Return.
XP FINDSTR also converts a number of extended ASCII characters to dots as well. The extended ASCII characters that display as dots on XP are the same as those that are transformed when supplied on the command line. See the "Character limits ...
How does a Java HashMap handle different objects with the same hash code?
... number - that's what identifies the bucket. When you put a key-value pair into the map, the hashmap will look at the hash code of the key, and store the pair in the bucket of which the identifier is the hash code of the key. For example: The hash code of the key is 235 -> the pair is stored in b...
Random number generator only generating one random number
...);
private static readonly object syncLock = new object();
public static int RandomNumber(int min, int max)
{
lock(syncLock) { // synchronize
return random.Next(min, max);
}
}
Edit (see comments): why do we need a lock here?
Basically, Next is going to change the internal stat...
insert a NOT NULL column to an existing table
...with valid not null values and finally ALTER column to set NOT NULL constraint:
ALTER TABLE MY_TABLE ADD STAGE INT NULL
GO
UPDATE MY_TABLE SET <a valid not null values for your column>
GO
ALTER TABLE MY_TABLE ALTER COLUMN STAGE INT NOT NULL
GO
Another option is to specify correct default va...
std::auto_ptr to std::unique_ptr
...a unique_ptr can only be moved. Anything that looks like
std::auto_ptr<int> p(new int);
std::auto_ptr<int> p2 = p;
will have to become at least like this
std::unique_ptr<int> p(new int);
std::unique_ptr<int> p2 = std::move(p);
As for other differences, unique_ptr can h...
How to use the toString method in Java?
... returns a string equal to the value
of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
Example:
String[] mystr ={"a","b","c"};
System.out.println("mystr.toString: " + mystr.toString());
output:- mystr.toString: [Ljava.lang.String;@13aaa14a
...
Using Case/Switch and GetType to determine the object [duplicate]
... .ToString(). However, I would avoid it at all costs: IDictionary<Type, int> will do much better, visitor might be an overkill but otherwise it is still a perfectly fine solution.
share
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impr...
Call apply-like function on each row of dataframe with multiple arguments from each row
... Don't use apply on big data.frames it will copy the entire object (to convert to a matrix). This will also cause problems If you have different class objects within the data.frame.
– mnel
Feb 25 '13 at 2:47
...
Error: Jump to case label
...ich does exist but probably contains garbage.
switch(foo) {
case 1:
int i = 42; // i exists all the way to the end of the switch
dostuff(i);
break;
case 2:
dostuff(i*2); // i is *also* in scope here, but is not initialized!
}
Wrapping the case in an explicit block solves the p...
Difference between final and effectively final
...statement in the PhoneNumber constructor:
public class OutterClass {
int numberLength; // <== not *final*
class PhoneNumber {
PhoneNumber(String phoneNumber) {
numberLength = 7; // <== assignment to numberLength
String currentNumber = phoneNumber.replaceAll(
...