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What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
...als
The program consisting of the compilation unit (§7.3):
package testPackage;
class Test {
public static void main(String[] args) {
String hello = "Hello", lo = "lo";
System.out.print((hello == "Hello") + " ");
System.out.print((Other.hello == hello) + " ");
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Is it safe to remove selected keys from map within a range loop?
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I was wondering if a memory leak could happen. So I wrote a test program:
package main
import (
log "github.com/Sirupsen/logrus"
"os/signal"
"os"
"math/rand"
"time"
)
func main() {
log.Info("=== START ===")
defer func() { log.Info("=== DONE ===") }()
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Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?
...ing PyPy will give a 6.3 times improvement even for the programs they have tested.
There is no claim that PyPy will even run all the programs that CPython runs at all, let alone faster.
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imp...
postgresql return 0 if returned value is null
...he second is if there are NULL values in the query.
For all versions I've tested, postgres and mysql will ignore all NULL values when averaging, and it will return NULL if there is nothing to average over. This generally makes sense, as NULL is to be considered "unknown". If you want to override t...
Should I be concerned about excess, non-running, Docker containers?
... The docs for the RUN command have now moved to: docs.docker.io/en/latest/reference/builder/#run
– aculich
Feb 20 '14 at 3:24
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In JavaScript, is returning out of a switch statement considered a better practice than using break?
...y code (missing the 2nd " in "Two") but it works for me... here's a simple test: var o={1:"One",2:"Two",3:"Three"},opt=2; alert(opt in o?o[opt]:"");
– ic3b3rg
May 24 '11 at 19:12
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How to randomly select rows in SQL?
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The table name change was simply an artifact from testing. The actual table name doesn't matter, as long as the correct table is used. min() and max() can both be queried in one query rather than two, which is what I was trying to show.
– Protiguous
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Capturing Groups From a Grep RegEx
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it worked for some simple test cases... \2 gets the inner group
– cobbal
Dec 12 '09 at 6:01
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“From View Controller” disappears using UIViewControllerContextTransitioning
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wow. That did it! I tested without modalPresentationStyle in iOS7 & 8 and it works find in both. Thanks!!
– Ah Ryun Moon
Sep 9 '14 at 23:26
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How do I find the most recent git commit that modified a file?
... relative path names with wildcards, for ex:
git rev-list origin/user/bob/testbranch -1 src/bfiles/*.txt
...Which would tell you what the most recent change was to the wildcard match in that branch's history. The options for rev-list are extreme, it is one of the most important plumbing commands,...