Number of days in particular month of particular year

// Create a calendar object and set year and month

Calendar mycal = new GregorianCalendar(1999, Calendar.FEBRUARY, 1);

// Get the number of days in that month
int daysInMonth = mycal.getActualMaximum(Calendar.DAY_OF_MONTH); // 28

// Try month in a leap year
mycal = new GregorianCalendar(2000, Calendar.FEBRUARY, 1);
daysInMonth= mycal.getActualMaximum(Calendar.DAY_OF_MONTH);     // 29

Random Array

Untuk mengacak atau membikin randomize sebuah array, disini kita menggunakan Collections.shuffle, langsung saja contohnya :

String[] contohArray = {"A","B","C","D","E","F};

Collections.shuffle(Arrays.asList(contohArray))

//Untuk melihat hasil acak array bisa dengan :

for(int i=0;i<5;i++) {

System.out.println(contohArray), //hasilnya : {"B","D","A","F","E","C"}, {"A","F","C","D","B","E"}, dst...

}

//Untuk mengambil salah satu hasil acakan array tersebut bisa dengan :

System.out.println(contohArray[0]);

Happy Coding!

Generate Random Number in Specific Range

Apabila kita ingin membuat randomize angka dengan jarak (range) angka tertentu, misalnya :

membuat random data angka antara 100 s/d 315, maka coding nya adalah sbb :

Random rand = new Random();
int angkaRandom = rand.nextInt(315-100)+100;

hasil angkaRandom diatas antara 100 dengan 315 , akan tetapi angka 315 tidak ikut dalam pemilihan data.

Apabila angka 315 ingin diikutkan dalam pemilihan data maka :

Random rand = new Random();
int angkaRandom = rand.nextInt(316-100)+100;

 

Problem Installing Moxa Driver CP-168U with kernel newer than 2.6.30

error message :
/home/some_user_dir/mxser/driver/mxser.c: In function ‘mxser_flush_buffer’:
/home/some_user_dir/mxser/driver/mxser.c:1990: error: request for member ‘ops’ in something not a structure or union
make[3]: *** [/home/some_user_dir/mxser/driver/mxser.o] Error 1
make[2]: *** [_module_/home/some_user_dir/mxser/driver] Error 2

find mxser.c and mxupcie.c inside folder driver (driver/mxser.c & driver/mxupcie.c)
open the file using vi or text editor and search “tty->ldisc.ops” (without quotes) change to “tty->ldisc->ops” (without quotes)

save the files and compile again, Good luck !!

Execute Shell Command From Java

Code Example :

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ExecShell {

   public static void main(String[] args) {

      String cmd = "ls -al";
      Runtime run = Runtime.getRuntime();
      Process pr = null;
      try {
         pr = run.exec(cmd);
         pr.waitFor();
         BufferedReader buf = new BufferedReader(new InputStreamReader(pr.getInputStream()));
         String line = "";
         while ((line=buf.readLine())!=null) {
            System.out.println(line);
         }
      } catch (IOException e) {
         e.printStackTrace();
      } catch (InterruptedException e) {
         e.printStackTrace();
      }
   }

}


			

Login Session di Aplikasi Desktop Java

Bikin aja 1 class nama class bebas, kemudian bikin property userLogin dan buatin getter/setter dengan
akses static.
Saat login , set property userLogin tersebut dengan username yg dipake login.
Sample :

public class UserSession {

  private static String userLogin;

  public static void setUserLogin(String userLogin) {
    UserSession.userLogin = userLogin;
  }

  public static String getUserLogin() {
    return userLogin;
  }
}

 

/*** login ***/
if (username.equals("valid_user") && password.equals("valid_password")) {
  // set username ke session
  UserSession.setUserLogin(username);
}

// Ingin nampilin ke form? tinggal panggil spt ini

lblInfoUser.setText(UserSession.getUserLogin());

MS Word 2010 : How to add Page Number in each Column

Use Word fields :
Tab Insert -> Quick Parts -> field

Place a one row, two column TABLE in the footer that aligns with your text columns. In the left cell insert:

{ = {PAGE} * 2 – 1 }

In the right cell:

{ = {PAGE} * 2 }

Insert { } field brackets, by using Ctrl+F9. Alt+F9 will let you switch between the field code and field result displays, F9 will force the displays to update.

Installing Oracle 10G on Centos 5 (32bit)

Creating Oracle User Account :

$ su - root
$ groupadd dba
$ groupadd oinstall
$ useradd -c "Oracle Software Owner" -g oinstall -G dba oracle
$ passwd oracle

Setting Oracle Environments

$ su - oracle
$ pwd #the directory has to be /home/oracle

use vi or nano to edit profile

$ nano .bash_profile

content of .bash_profile :

echo "Welcome to ORACLE Environment"

export ORACLE_BASE=/oracle</em></span>
export ORACLE_HOME=/oracle/product/10.1.0
export ORACLE_SID=oraclesid  #name of oracle instance service
export JAVA_HOME=/usr/java/jdk1.5.0_15 #Home directory for java (edit by yourself)
export PATH=$JAVA_HOME/bin:/usr/lib/qt-3.3/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:$ORACLE_HOME/bin
export LD_LIBRARY_PATH=/lib:$JAVA_HOME/lib:$ORACLE_HOME/lib:.

Creating Oracle Home Directory (as mention in .bash_profile)

$ su - root
$ mkdir /oracle

Change Ownership for Oracle Home Directory (/oracle)

$ chown -R oracle:oinstall /oracle

Check Installed RPMs (make sure all RPMs is Installed)

$ rpm -q binutils compat-db control-center gcc gcc-c++ glibc glibc-common gnome-libs libstdc++ libstdc++-devel make pdksh sysstat xscreensaver libaio compat-libstdc++-33 glibc-devel

Results :

binutils-2.17.50.0.6-14.el5
package compat-db is not installed
control-center-2.16.0-16.el5
gcc-4.1.2-48.el5
package gcc-c++ is not installed
glibc-2.5-49.el5_5.7
glibc-common-2.5-49.el5_5.7
package gnome-libs is not installed
libstdc++-4.1.2-48.el5
package libstdc++-devel is not installed
make-3.81-3.el5
package pdksh is not installed
package sysstat is not installed
package xscreensaver is not installed
libaio-0.3.106-5

.:: Install Package which not installed ::.

Install xorg-x11-deprecated-libs

$ yum install xorg-x11-deprecated-libs

Set Display to allow from any hosts

$ su - root
$ xhost +

Change RedHat Release

$ cp /etc/redhat-release /etc/redhat-release.orig
$ cat > /etc/redhat-release << EOF
$ Red Hat Enterprise Linux AS release 3 (Taroon)
$ EOF

After you are done with the Oracle10g installation, undo the changes you made to /etc/redhat-release

$ su - root</span><em>
$ cp /etc/redhat-release.orig   /etc/redhat-release

Checking Kernel Parameters (Important!)
To see all kernel parameters, execute:

$ su - root
$ sysctl -a

For Oracle10G, the following kernel parameters have to be set to values greater than or equal to the recommended values which can be changed in the proc filesystem:

shmmax  = 2147483648 (To verify, execute: cat /proc/sys/kernel/shmmax)
shmmni  = 4096 (To verify, execute: cat /proc/sys/kernel/shmmni)
shmall  = 2097152 (To verify, execute: cat /proc/sys/kernel/shmall)   (for 10g R1)
shmmin  = 1 (To verify, execute: ipcs -lm |grep “min seg size”)
shmseg  = 10 (It’s hardcoded in the kernel – the default is much higher)
semmsl  = 250 (To verify, execute: cat /proc/sys/kernel/sem | awk ‘{print $1}’)
semmns  = 32000 (To verify, execute: cat /proc/sys/kernel/sem | awk ‘{print $2}’)
semopm  = 100 (To verify, execute: cat /proc/sys/kernel/sem | awk ‘{print $3}’)
semmni  = 128 (To verify, execute: cat /proc/sys/kernel/sem | awk ‘{print $4}’)
file-max = 65536 (To verify, execute: cat /proc/sys/fs/file-max)
ip_local_port_range = 1024 65000 (To verify, execute: cat /proc/sys/net/ipv4/ip_local_port_range)

NOTE: Do not change the value of any kernel parameter on a system where it is already higher than listed as minimum requirement.

Edit /etc/sysctl.cont

$ nano /etc/sysctl.conf

add :

kernel.sem=250 32000 100 128
fs.file-max=65536
net.ipv4.ip_local_port_range=1024 65000
net.core.rmem_default=262144
net.core.wmem_default=262144
net.core.rmem_max=262144
net.core.wmem_max=262144

Download / copy Oracle 10G Source Binary to Oracle User Directory (/home/oracle)
10201_database_linux_x86_64.cpio.gz

$ gunzip 10201_database_linux_x86_64.cpio.gz
$ cpio -idmv < 10201_database_linux_x86_64.cpio
$ cd database
$ ./runInstaller

Install Windows XP dari USB Flashdisk

Syarat-syarat yang harus di penuhi:

• Menyediakan USB Flashdisk Minimal 1 GB Kosongan
• Komputer
• CD Instalasi Windows XP
• Mental Baja

Berikut caranya :

+ Download File ( PeToUSB_3.0.0.7.zip, bootsect.zip, usb_prep8.zip) klik disini untuk download
+ Buat Folder Baru dengan Nama USB_Tools dan Ekstrak File yang sudah di download tadi dalam Folder USB_Tools

• bootsect.zip menghasilkan folder bootsect
• usb_prep8.zip menghasilkan folder usb_prep8
• PeToUSB menghasilkan File PeToUSB.exe

+ Copy PeToUSB.exe ke Folder usb_prep8
+ Pasang USB Flashdisk ke komputer terus lihat flashdisk ada di drive apa sebagai contoh disini saya menggunakan drive G
+ klik ganda file usb_prep8.cmd di folder \USB_Tools\usb_prep8

+ Tekan ENTER dan keluar Gambar seperti di bawah ini :

+ Centang  USB Removable
+ Di bawahnya pilih Drive USB Flashdisk yang akan digunakan untuk install
+ Centang Enable Disk Format
+ Centang Enable LBA (FAT 16 x)
+ Klik Start

+ Klik Yes
+ Jangan Tutup window PeToUSB dan cmd.exe
+ Klik Start -> Run -> ketik cmd setelah muncul Command Prompt pindah ke direktori USB_Tools dan masuk ke subdirektori bootsect (\USB_Tools\bootsect)
+ Ketik “BootSect.exe /nt52 g:” (dengan contoh Flashdisk di Drive G)

+ Tutup window PeToUSB (yg buat format usb) dan akan muncul window cmd.exe dengan beberapa pilihan

+ Tekan 1, lalu masukan drive dimana Installer XP berada
+ Tekan 2, untuk masukan lokasi virtual drive (pake drive T aja, default)
+ Tekan 3, utuk masukan lokasi drive flashdisk (contoh pake G)
+ Tekan 4, untuk mulai melakukan copy File Installer

+ Apabila ditanya Format, jawab Yes
+ Apabila ditanya Copy To USB-Drive, jawab Yes
+ Apabila ditanya change migrate.inf, jawab Yes
+ Apabila ditanya unmount virtual drive, jawab Yes

Proses Pembuatan Installer USB Telah Selesai, Gampang Kan ?

TIPS Penting Untuk Diperhatikan :
+ Saat Boot via USB Pilih No 1
+ Setelah Restart Pilih No 2
+ Setelah Restart lagi Pilih No 2

Modifikasi boot.ini yang ada di Flashdisk agar dapat berjalan lancar :
Copy Paste di bawah ini dan overwrite ke boot.ini

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS=”Microsoft Windows XP Professional” /noexecute=optin /fastdetect

Memperbaiki Booting System Windows XP

Windows XP anda gak bisa booting ? atau restart terus menerus pada saat booting ? Coba baca tips berikut ini :

Masuk ke Safe Mode :
Reboot PC Anda sambil tekan dan tahan F8 Key.  Di Advanced Options Menu pilih opsi untuk Safe Mode dan tekan Enter.

Masuk ke Recovery Console :
Untuk menjalankan Recovery Console , pilih boot dari CD Windows XP dan pilih “R” di Welcome Screen.

Layar akan berganti warna hitam dan anda akan ditanya dimana folder instalasi windows untuk dipakai login. Jika anda hanya punya satu instalasi windows tekan “1”. Ingat!! Numlock off disini.

Berikutnya Anda akan diminta memasukkan Admin password. Defaultnya kosong, jadi tekan Enter saja.

Di C:\Windows command prompt ketik “Help” untuk melihat list of commands yang anda dapat pakai.

Untuk mengganti rusaknya File ntldr dan ntdetect.com Anda dapat meng-copy file baru dari XP CD menggunakan perintah COPY.
Boot dengan XP CD dan masuk ke Recovery Console (seperti dijelaskan diatas). Di Command Prompt ketik perintah berikut (dimana “X” adalah CD-Rom drive) mengijinkan file baru untuk menimpa file lama

COPY X:\i386\NTLDR C:
COPY X:\i386\NTDETECT.COM C:

Untuk memperbaiki Boot Sector yang rusak, di command prompt ketik FIXBOOT dan tekan Enter, kemudian jawab “Y”

Setelah selesai REBOOT PC Anda.