====== Java concept ======
C++ Code --> Executable --> OS --> CPU

Java code --> Class --> { "JVM win", "JVM linux", CPU that supports JAVA} --> OS --> CPU

Java is like a application (Your Java app) running in another application (JavaVM). \\
so you need cmd java to run your app (.class)<code>
javac yourJavaApp.java
java youJavaApp</code>

====== Java tool, library and system environment path ======

  * Java IDE list:
    * Eclipse (green): http://www.eclipse.org/downloads/packages/eclipse-ide-java-developers/indigosr1

  * J2EE - for Enterprise system and application 
  * J2SE - for desktop application
    * mostly used: http://www.oracle.com/technetwork/java/javase/downloads/index.html
    * then click download Java JDK,
      * for windows x86 direct link: http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-windows-i586.exe
      * idiot spoon feeding video guide if you're too lazy to google or youtube: http://www.youtube.com/watch?v=Hl-zzrqQoSE
  * J2ME - for micro and mobile application

add java bin directory path to system environment or user profile environment variable:
  * for win dos <code dos> set path=c:\java\bin\location;%PATH%</code>
    * or go system property > environment variable > user variable : path; and add java location at end
  * for mac,linux <code bash> export path=/java/bin/location:$PATH</code>
    * or edit ~/.bash_profile, add this cmd line in it.


====== Portable Java JRE ======
  - copy existing JRE to portable device
  - when use, in mac or linux terminal, <code>export JAVA_HOME=/jre_dir/bin/java
export PATH=/jre_dir/bin:$PATH </code> and in dos <code>set path = %PATH%;d:\jre_dir\bin
set JAVA_HOME=d:\jre_dir\bin\java
</code>
  - force java use local  JRE instead of asking system for it <code>java -verbose -jar MyApp.jar</code>


====== Quick Syntax ======

  * Data type and access
    * String <code java>// compare string
new String("test").equals("test") //==> true 
//ref: http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java
</code>
    * Array (static type)<code java>
int num[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
System.out.println("size of num[]: " + num.length);
</code>
    * Dynamic array<code java>import java.util.ArrayList; 
private ArrayList<Item> items = new ArrayList<Item>();
System.out.println(items.size());
</code>
  * GUI
    * Layout <code java>FlowLayout() //FlowLayout.LEFT, FlowLayout.CENTER, FlowLayout.RIGHT, FlowLayout.LEADING, FlowLayout.TRAILING
GridLayout(int rows, int columns) 
BorderLayout()
BoxLayout()
GroupLayout()
SpringLayout()
//ref: http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
</code>
    * JTable operation:
      * method list: http://docs.oracle.com/javase/7/docs/api/javax/swing/JTable.html
      * header update ref: http://www.roseindia.net/java/example/java/swing/ChangeColumnName.shtml
        * refresh header display after update <code java>
listTable.getTableHeader().getColumnModel().getColumn(0).setHeaderValue("IC No");
listTable.getTableHeader().repaint();
//ref: http://www.java.net/node/692818
</code>
      * update date ref: http://stackoverflow.com/questions/5918727/updating-data-in-a-jtable
      * fill data <code java>
for(int i=0;i<list.length;i++){
    listTable.getModel().setValueAt(list[i].getICNO(), i, 0);
    listTable.getModel().setValueAt(list[i].getFirstName(), i, 1);
    listTable.getModel().setValueAt(list[i].getLastName(), i, 2);
    listTable.getModel().setValueAt(list[i].getTitle(), i, 3);
    listTable.getModel().setValueAt(list[i].getOrg(), i, 4);
}
</code>
      * clear data <code java>
for (int i = 0; i < table.getRowCount(); i++)
  for(int j = 0; j < table.getColumnCount(); j++) {
    table.setValueAt("", i, j);
  }
}
</code>
    * user input
      * custom form dialog <code java>String[] n_arr=new String[3];
JTextField icno = new JTextField();
JTextField firstName = new JTextField();
JTextField lastName = new JTextField();
final JComponent[] inputs = new JComponent[] {
new JLabel("IC NO"),
icno,
new JLabel("First Name"),
firstName,
new JLabel("Last Name"),
lastName
};
JOptionPane.showMessageDialog(null, inputs, "Member Creation", JOptionPane.PLAIN_MESSAGE);
        
n_arr[0]=icno.getText();
n_arr[1]=firstName.getText();
n_arr[2]=lastName.getText();
</code>
  * Data validation for form guis
    * ref: http://www.codeproject.com/Articles/401805/A-framework-for-comprehensive-validation-of-user-i
====== Quick GUI dev and App dev with NetBean ======

  * Quick GUI design guide from JFrame in NetBean (25 min)
    * http://netbeans.org/kb/docs/java/quickstart-gui.html
  * Quick App Build guide with user interaction (15 min)
    * http://netbeans.org/kb/docs/java/gui-functionality.html

Some UI design Tips:
  * hide and show part of UI <code java>
panelA.setVisible(false);
//ref: http://www.codecommit.com/blog/java/techniques-of-java-ui-development
</code>

====== Program Design Pattern ======

  * MVC tips:
    * Calc example: http://leepoint.net/notes-java/GUI/structure/40mvc.html
====== Tutorials ======

  * video: http://www.youtube.com/user/VoidRealms/playlists