Recent Notes
Displaying keyword search results 1 - 10
Created by Dr. Xi on February 06, 2012 12:14:11
Last update: February 07, 2012 15:39:35
Oracle sqlplus command line tools does not support command line editing out-of-the-box. But on Linux there's a handy utility that enables command line editing with any command line tool: rlwrap - readline wrapper.
Install rlwrap:
$ sudo apt-get install rlwrap
Create a keywords file .sql.dict (optional, but convenient):
false null true
access add as asc begin by chec...
It would be nice to add the tables names also.
Create an alias for sqlplus (put it in .bashrc ):
alias sqlplus='rlwrap -f $HOME/.sql.dict sqlplus'
Created by James on January 11, 2011 22:08:26
Last update: February 03, 2012 11:23:25
By default Firefox puts a dotted line box around the link or button label when you click them. Sometimes it's annoying and makes your sexy buttons look ugly. You can get rid of the dotted lines for links with outline:none in CSS, but that doesn't work for buttons.
<!doctype html>
<html>
<head>
<style t...
For buttons you need " button::-moz-focus-inner { border: 0; } ":
<!doctype html>
<html>
<head>
<style t...
I've also seen this:
/* get rid of those system borders being generated...
For more information :
Remove Button Focus Outline Using CSS
Created by freyo on August 04, 2011 12:27:27
Last update: August 04, 2011 12:30:42
I got this error while building an APK:
[apply]
[apply] UNEXPECTED TOP-LEVEL ERROR...
Apparently the dx tool was running out of memory. The dx script (shell or bat) provides options to pass in Java options, but it's a lot easier just to bump up the default in dx :
# By default, give dx a max heap size of 1 gig. Th...
Here, I changed the default 1024M to 1624M and resolved the problem.
Created by alfa on July 15, 2011 13:25:45
Last update: July 15, 2011 13:25:45
Read the whole contents of a file into a String. It's better to read the whole file as bytes and convert to String than to read the file line by line and concatenate the lines.
String getFileContents(String fileName) throws...
Using java.nio :
import java.io.FileInputStream;
import java...
Created by magnum on June 23, 2011 13:08:47
Last update: June 23, 2011 13:08:47
In Linux shell (bash & ksh), executing " set -m " turns on job control . This option is on by default for interactive shells . Background processes run in a separate process group and a line containing their exit status is printed upon their completion.
Created by alfa on June 02, 2011 13:04:18
Last update: June 02, 2011 13:04:18
Some javap usage examples.
Start from HelloWorld.java :
@Deprecated
public class HelloWorld {
pu...
javap -c HelloWorld outputs:
Compiled from "HelloWorld.java"
public class He...
javap -v HelloWorld outputs ( -v for verbose mode):
Compiled from "HelloWorld.java"
public class He...
The output consists of:
" Compiled from... " header
Class attributes. For the HelloWorld example, there are two: SourceFile and Deprecated .
Minor and major class file version
Constant pool
Disassembled code
LineNumberTable for debugging purposes.
javap by default only prints package/protected/public members. To display all members including private, use the -p switch.
javap -v -p HelloWorld
Created by alfa on May 25, 2011 20:17:52
Last update: May 25, 2011 20:39:35
In Java regex, by default, the dot character does not match the newline character ( \n ). It matches a newline character only when the DOTALL flag is set.
Example:
import java.util.regex.*;
public class Dota...
Created by woolf on May 15, 2011 14:35:58
Last update: May 15, 2011 14:36:47
Assign IP adrress and network mask:
sudo ifconfig eth0 192.168.183.5 netmask 255.255.2...
Add default gateway:
sudo route add default gw 192.168.183.2
Add name server: " sudo vi /etc/resolv.conf " and add:
nameserver 192.168.183.2
Created by Dr. Xi on April 20, 2011 21:44:15
Last update: May 02, 2011 20:56:58
The String.format() method provides versatile formatting capabilities. This tutorial tries to present these capabilities in a accessible manner. The format string A format string can contain zero, one, or more format specifiers . The general form of a format specifier is:
%[argument_index$] [flags] [width] [.precision]co... where things in square brackets are optional, and conversion is a character indicating the conversion to be applied to the corresponding variable value. The only required characters in the format specifier is the percent sign % and the conversion character. A simple example: public static void simpleFormat() { System.out... The Argument index The argument index is specified by a number, terminated by the dollar sign $ . The same argument may be repeated multiple times in a format string. Unindexed...
Created by freyo on April 20, 2011 12:50:09
Last update: April 20, 2011 12:50:09
To sign an Android APK from command line:
Sign the APK with jarsigner (using default keystore, android-root is the alias of the signing key):
$ jarsigner -signedjar HelloWorld-new.apk HelloWor...
Verify signature (optional)
$ jarsigner -verify -verbose -certs HelloWorld-new...
Align the APK (must use -v 4 option):
$ ~/android-sdk-linux_86/tools/zipalign -v 4 Hello...
