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iPhone: Detecting user inactivity/idle time since last screen touch
...idleTimer release];
}
idleTimer = [[NSTimer scheduledTimerWithTimeInterval:maxIdleTime target:self selector:@selector(idleTimerExceeded) userInfo:nil repeats:NO] retain];
}
- (void)idleTimerExceeded {
NSLog(@"idle time exceeded");
}
where maxIdleTime and idleTimer are instance variab...
How to create custom exceptions in Java? [closed]
... throw or propagate this exception must declare it:
public void calculate(int i) throws FooException, IOException;
... and code calling this method must either handle or propagate this exception (or both):
try {
int i = 5;
myObject.calculate(5);
} catch(FooException ex) {
// Print error an...
What exactly is a Context in Java? [duplicate]
...current environment, etcetera.
In some API's you see this name back in an interface/class, e.g. Servlet's ServletContext, JSF's FacesContext, Spring's ApplicationContext, Android's Context, JNDI's InitialContext, etc. They all often follow the Facade Pattern which abstracts the environmental detail...
Is it safe to remove selected keys from map within a range loop?
... but rather some custom type that implements the func (a T) expired() bool interface. For purposes of this example, you could try: m := make(map[int]int) /* populate m here somehow */ for key := range (m) { if key % 2 == 0 { /* this is just some condition, such as calling expired */ delete(m, key);...
Scala downwards or decreasing for loop?
...
@Felix: You're welcome. I should have also pointed out that there is also until that you can use in place of to to exclude the right-hand end-point from the range. The left-hand endpoint is always included.
– Randall Schulz
Apr 13 ...
How to limit the amount of concurrent async I/O operations?
...ons of async for .NET, using .NET 4.5 Beta. The previous post from 'usr' points to a good article written by Stephen Toub, but the less announced news is that the async semaphore actually made it into the Beta release of .NET 4.5
If you look at our beloved SemaphoreSlim class (which you should be u...
Variable's scope in a switch case [duplicate]
...t. You can, however, create further nested scopes with braces as follows:
int key = 2;
switch (key) {
case 1: {
String str = "1";
return str;
}
case 2: {
String str = "2";
return str;
}
}
The resulting code will now compile successfully since the variable named str in each cas...
Pass a data.frame column name to a function
...want to save the user from typing all those quotes, one option might be to convert bare, unquoted column names to strings using deparse(substitute()):
new_column2 <- function(df,col_name,col1,col2){
col_name <- deparse(substitute(col_name))
col1 <- deparse(substitute(col1))
col...
Java synchronized method lock on object, or method?
...ce they're primitives you can't do this.
I would suggest you to use AtomicInteger instead:
import java.util.concurrent.atomic.AtomicInteger;
class X {
AtomicInteger a;
AtomicInteger b;
public void addA(){
a.incrementAndGet();
}
public void addB(){
b.increme...
How to delete large data of table in SQL without log?
... dropping this table you can get these relatively small amount of the rows into another table drop this table and create another table with same schema and import these rows back into this ex-Large table.
One last option I can think of is to change your database's Recovery Mode to SIMPLE and then de...