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How to check if an int is a null
...equals(null)) can't be true, because if person is null, then a NullPointerException will be thrown. So the correct expression is if (person == null)
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Use of Java's Collections.singletonList()?
...d list.
@return an immutable list containing only the specified object.
example
import java.util.*;
public class HelloWorld {
public static void main(String args[]) {
// create an array of string objs
String initList[] = { "One", "Two", "Four", "One",};
// create...
Frontend tool to manage H2 database [closed]
...rd for shutting down a TCP server
[-tcpShutdown ""] Stop the TCP server; example: tcp://localhost:9094
[-tcpShutdownForce] Do not wait until all connections are closed
[-pg] Start the PG server
[-pgAllowOthers] Allow other computers to connect - see below
[-pgPort ] ...
How to align an image dead center with bootstrap
...s
Set an element to display: block and center via margin. Available as a mixin and class.
Just need to add a class .center-block in the img tag, looks like this
<div class="container">
<div class="row">
<div class="span4"></div>
<div class="span4"><img cla...
javascript check for not null
...null' as a string.
Try to check with 'null'
if ('null' != val)
For an explanation of when and why this works, see the details below.
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How do I list the functions defined in my shell?
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in GNU bash 4.3.46(1)-release (x86_64-pc-linux-gnu) -F lists names / -f lists whole function
– ceph3us
Jul 29 '16 at 5:35
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How do I remove all .pyc files from a project?
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find . -name "*.pyc" -exec rm -f {} \;
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Using the star sign in grep
I am trying to search for the substring "abc" in a specific file in linux/bash
10 Answers
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How to check “hasRole” in Java Code with Spring Security?
How to check user authority or permission in Java Code ? For example - I want to show or hide button for user depending on role. There are annotations like:
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Keyboard shortcut to comment lines in Sublime Text 3
In Sublime Text 2 it was possible to comment out a line or a block of lines with Ctrl + / and Ctrl + Shift + / . According to the menu Edit > Comment these shortcuts should be valid, but in Sublime Text 3 (build 3047) they no longer seem to work. Does anybody know the right default keyboard...