Example : How to start/open Java (offline project) using Net Beans IDE 8.2 .
- Open Netbeans IDE 8.2 - File - New Project - Select 'Java' from Categories - Select 'Java 
  Applications' from Projects - Next - Put name of project in 'Project Name' box say 'Java 
  Application1' - Select the project saving location such as C/D/E drive etc. - Uncheck 'Create Main 
  Class' option strictly - Finish - Now Java project window appears with 'Projects,Files & Services' 
  Tabs - .
Example : How to create a new java package/change the ‘default package’ name of Java            Applications using Net Beans IDE 8.2 .
- Right click on 'Source Package' of Project name (Java Applications) list - New - Java Package - 
  change the name as per need - ok.
Example : How to create new jFrame / jInternal Frame / jPanel / jDialog form file using              Net Beans IDE 8.2 .
- Right click on 'Source Package/Default Package' name - New - Other - Swing GUI Forms - choose  
  needed form file - change the name of chosen form file - finish.
Example : How to recover the disappear Palette / Properties window / Projects tabs /                Files tabs / Services  tabs in Net Beans IDE 8.2 .
- Click on 'Window' menu in Net Beans IDE 8.2 - choose 'Projects/Files/Services' or 'IDE Tools' - 
  choose 'Palette/Properties' option.
Example : How to recover the disappear Source Code Editor / Design Window in Net Beans IDE 8.2 .
- Open Netbeans IDE 8.2 - View menu - check 'show Editor Toolbar'. 
--------------  OR  -------------
- Open Netbeans IDE 8.2 - View menu - click 'Editors' and choose required one.
--------------  OR  -------------
- Open Netbeans IDE 8.2 - open the Page - Right click on open Page tab - Editors - Choose one.
Example : How to run /execute java application form in Net Beans IDE 8.2 .
3 ways to run the file - 
- Right click on JFrame Form list in 'Source Package' of java project in 'Projects' tab - click 'Run 
  File'.
- click on 'Run Project' icon (Triangle Symbol) in the toolbar of Net Beans IDE - Select 'JFrame 
  Form' to execute it.
- Open 'JFrame Form' we want to execute - select 'Source' tab at upper left portion of page - Right 
  click in the page - Select 'Run File'.
Example : How to close/exit java application form in Net Beans IDE 8.2 .
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{
    System.exit(0);
    //super.dispose();
}
Example : How to convert String into Integer and its vice-versa in java using Net Beans IDE 8.2 .
import static javax.swing.JOptionPane.*;

    public NumConverion() {
        initComponents();
        
        int x1 =Integer.parseInt("1015");     //Code for String into Integer Conversion.
        showMessageDialog(null,x1);

        int x2 =Integer.parseInt("1025");
        showMessageDialog(null,x2);

        int x3 = x1+x2;
        showMessageDialog(null,x3);
        
        String Str= Integer.toString(x3);       //Code for Integer into String Conversion.
        showMessageDialog(null,"Total Value = "+ x1+ "+" + x2+ " is "+Str,"Calculation Result",
             INFORMATION_MESSAGE);       
    }
Example : How to move cursor in next java controls on pressing Enter key button in java using Net Beans IDE 8.2. [Enter Event Code]
private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) {
        int x= evt.getKeyCode();          // evt  is default event.
        if (x == 10)     // 10 is KeyCode for enter key.
          {                     
            jTextField2.requestFocus();
          }

-----------  OR  -----------
private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) {
        if(evt.getKeyCode()== KeyEvent.VK_ENTER)
           {
            jTextField2.grabFocus();
           }
    }
NB : Path = Right click on the text field – Events – Key – Keypressed. Now write above Code is in appeared code area. Do same for all the remaining java controls.
Example : How to move cursor in next java controls on pressing Up & Down arrow key button in java using Net Beans IDE 8.2. [Arrow Key Event Code]
private void jTextField2KeyPressed(java.awt.event.KeyEvent evt) {
          if (evt.getKeyCode() == KeyEvent.VK_UP)          
          {
             jTextField1.requestFocus();
          }
           ---------------------------      
          if (evt.getKeyCode() == KeyEvent.VK_DOWN)           
          {
             jTextField3.requestFocus();
          }
 }
Example : How to maximize jFrame automatically on load event.
public registration() 
{
     initComponents();
        setExtendedState(java.awt.Frame.MAXIMIZED_BOTH);     // to maximize the jFrame window.
        //this.setExtendedState(this.MAXIMIZED_BOTH);        // to maximize the jFrame window.
}

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