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What is the difference between loose coupling and tight coupling in the object oriented paradigm?
...nathanconway thank you sir but both pieces of code do the same thing: what then is the difference between them? i.e. what advantages are there to loosely coupling?
– BKSpurgeon
Jun 19 '16 at 9:37
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Error during installing HAXM, VT-X not working
...mpleting the install). Unchecked the box in Avast, rebooted and HAXM could then be installed. An AVD now using the x86 android image (rather than a virtual ARM device) loads much faster and is completely slick to use.
– C Dobson
Jun 12 '14 at 9:19
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How to check if a process id (PID) exists
...ased on the exit code, you can
if ! kill $pid > /dev/null 2>&1; then
echo "Could not send SIGTERM to process $pid" >&2
fi
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...unction array_agg(expression) which concatenates the values into an array. Then array_to_string() can be used to give the desired result:
SELECT company_id, array_to_string(array_agg(employee), ', ')
FROM mytable
GROUP BY company_id;
string_agg for pre-8.4 versions:
In case anyone comes across t...
Merge, update, and pull Git branches without using checkouts
...
The Short Answer
As long as you're doing a fast-forward merge, then you can simply use
git fetch <remote> <sourceBranch>:<destinationBranch>
Examples:
# Merge local branch foo into local branch master,
# without having to checkout master first.
# Here `.` means to use ...
if, elif, else statement issues in Bash
...e issue with the following if statement is in regards to the elif and then . Keep in mind the printf is still under development I just haven't been able to test it yet in the statement so is more than likely wrong.
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How to wait for several Futures?
...Result)
In this example, futures 1, 2 and 3 are kicked off in parallel. Then, in the for comprehension, we wait until the results 1 and then 2 and then 3 are available. If either 1 or 2 fails, we will not wait for 3 anymore. If all 3 succeed, then the aggFut val will hold a tuple with 3 slots, ...
android View not attached to window manager
...eted. I seemed to resolve this by setting the dialog to null onPause() and then checking this in the AsyncTask before dismissing.
@Override
public void onPause() {
super.onPause();
if ((mDialog != null) && mDialog.isShowing())
mDialog.dismiss();
mDialog = null;
}
......
Relationship between hashCode and equals method in Java [duplicate]
...sn't; first, the hash code of the key is calculated, the correct bucket is then queried for equality. If you don't override .equals(), you may be in a situation where two objects with the same hash code are not equal, since the default implementation of .equals() is reference equality (ie, ==).
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How does the String class override the + operator?
...te class instance
creation expression (§15.9):
If T is boolean, then use new Boolean(x).
If T is char, then use new Character(x).
If T is byte, short, or int, then use new Integer(x).
If T is long, then use new Long(x).
If T is float, then use new Float(x).
If T is double, then ...