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super() in Java
...uctor of the parent class.
OK, now let’s practically implement these points of super().
Check out the difference between program 1 and 2. Here, program 2 proofs our first statement of super() in Java.
Program 1
class Base
{
int a = 100;
}
class Sup1 extends Base
{
int a = 200;
vo...
Simple (non-secure) hash function for JavaScript? [duplicate]
... hash = ((hash<<5)-hash)+char;
hash = hash & hash; // Convert to 32bit integer
}
return hash;
}
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How to iterate for loop in reverse order in swift?
...can be used as below:
for index in stride(from: 5, to: 1, by: -1) {
print(index)
}
//prints 5, 4, 3, 2
for index in stride(from: 5, through: 1, by: -1) {
print(index)
}
//prints 5, 4, 3, 2, 1
Note that neither of those is a Range member function. They are global functions that return eit...
Wrong requestCode in onActivityResult
...ect resultCode in your activity try this:
Change:
startActivityForResult(intent, 1);
To:
getActivity().startActivityForResult(intent, 1);
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What is the difference between ManualResetEvent and AutoResetEvent in .NET?
...er1()
{
Console.WriteLine("Entered in worker 1");
for (int i = 0; i < 5; i++) {
Console.WriteLine("Worker1 is running {0}", i);
Thread.Sleep(2000);
autoReset.WaitOne();
}
}
public void Worker2()
{
Console.WriteLin...
Formatting code in Notepad++
... Delete to start of line
Ctrl-Shft-Delete Delete to end of line
Ctrl-U Convert to lower case
Ctrl-Shft-U Convert to UPPER CASE
Ctrl-B Go to matching brace
Ctrl-Shft-R Start to record /Stop recording the macro
Ctrl-Shft-P Play recorded macro
Ctrl-Q Block comment/uncomment
Ctrl-Shft-Q Stream com...
What's the Best Way to Shuffle an NSMutableArray?
... NSMutableArray by providing
// methods to randomly shuffle the elements.
@interface NSMutableArray (Shuffling)
- (void)shuffle;
@end
// NSMutableArray_Shuffling.m
#import "NSMutableArray_Shuffling.h"
@implementation NSMutableArray (Shuffling)
- (void)shuffle
{
NSUInteger count = [self cou...
pandas GroupBy columns with NaN (missing) values
...cient topic, if someone still stumbles over this--another workaround is to convert via .astype(str) to string before grouping. That will conserve the NaN's.
df = pd.DataFrame({'a': ['1', '2', '3'], 'b': ['4', np.NaN, '6']})
df['b'] = df['b'].astype(str)
df.groupby(['b']).sum()
a
b
4 1
6 ...
Static Initialization Blocks
...u create.
Example:
public class Test {
static{
System.out.println("Static");
}
{
System.out.println("Non-static block");
}
public static void main(String[] args) {
Test t = new Test();
Test t2 = new Test();
}
}
This prints:
Static
Non-s...
Confused about __str__ on list in Python [duplicate]
...
Python has two different ways to convert an object to a string: str() and repr(). Printing an object uses str(); printing a list containing an object uses str() for the list itself, but the implementation of list.__str__() calls repr() for the individual it...