copy a text to clipboard in Java

Easily done via Java Toolkit

StringSelection selection = new StringSelection(theString);
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
clipboard.setContents(selection, selection);

commenting a line in Netbeans

commenting a line in Netbeans ? Try this

Ctrl + Shift + C

Source : https://netbeans.org/project_downloads/usersguide/shortcuts-80.pdf

Auto-Format, Visual Studio

- CTRL-A to select the whole text.
- Ctrl+K- Ctrl + F

 Before Auto Format

Ctrl - A selects the whole text

Ctrl K + Ctrl F, auto formats the whole text

start jFrame in the center of the screen

// Get the size of the screen
    Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
    
    // Determine the new location of the window
    int w = window.getSize().width;
    int h = window.getSize().height;
    int x = (dim.width-w)/2;
    int y = (dim.height-h)/2;
    
    // Move the window
    window.setLocation(x, y);

Integrating power of Java & Processing :-)

In the following link you can find how to import processing libraries to a Java class where you can combine the power of Java with the flexibility of Processing and make miracles ;-)

http://processing.org/learning/eclipse/

Source : Processing.org

Android & WiFi information, Wifimanager + Wifiinfo

For having access to the WiFi connection, you can use the WifiManager and WifiInfo classes in Android SDK. The following code can show you how you can do get access to things like your IP address, the connected network name or the available networks around you :

        WifiManager myWifiMananger = (WifiManager) getSystemService(WIFI_SERVICE);

        WifiInfo myNetInfo = myWifiMananger.getConnectionInfo();

        showIp.append(changeIp(myNetInfo.getIpAddress()) + " \n");

        showIp.append(myNetInfo.getSSID() + " ");

        List<ScanResult> scanList = myWifiMananger.getScanResults();

        for(ScanResult element : scanList){

         showIp.append(element.SSID + " Level: " + element.level + " freq : " + element.frequency + " Cap: " + element.capabilities + "\n");

        }
//DONT forget that the getIpAddress returns an int value. Convert it to string :
public String changeIp(int ipAddress){

     return String.format("%d.%d.%d.%d",

       (ipAddress & 0xff),

       (ipAddress >> 8 & 0xff),

       (ipAddress >> 16 & 0xff),

       (ipAddress >> 24 & 0xff));

    }

*** VERY IMPORTANT : To use this you need to add couple of lines to android manifest(XML file -> AndroidManifest.xml).

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

  <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

How to tile a background image in Android

Very good tutorial :
http://androidforbeginners.blogspot.com/2010/06/how-to-tile-background-image-in-android.html

Convert array of strings to a list, C#

It is very easy to convert an array of string to a list in C-sharp :


// this line returns an array of file names
string[] fileEntries = Directory.GetFiles("c:/test");
List fileList = new List(fileEntries.Length);//convert an array to List

String & Javascript

String in Javascript, cool link : http://www.javascriptkit.com/javatutors/string4.shtml

Javascript, forward to another page according to the refferer URL

<!-- Hide script from old browsers<br>

if (document.referrer.indexOf("facebook") != -1)
//document.write("From facebook")
location.href = "www.yourpage.com";
else
document.write("Not from facebook so we stay on this page")
//-- Stop hiding script -->

KeyListener in Java

If you want to write a code in Java which is based on keys being pressed on keyboard, then KeyListener is your way a head. This link at Oracle.com has a very nice description of the whole class and a very good example :

http://download.oracle.com/javase/tutorial/uiswing/events/keylistener.html

HOWTO : add/remove a String Item to jComboBox, Java

jComboBox :

// Add an item to the start of the list
cb.insertItemAt("item0", 0);

// Add an item after the first item
cb.insertItemAt("item0.5", 1);

// Add an item to the end of the list
cb.addItem("item3");

// Remove first item
cb.removeItemAt(0);

// Remove the last item
cb.removeItemAt(cb.getItemCount()-1);

// Remove all items
cb.removeAllItems();

HOWTO : get a list of available ports, Java

If you want to ahve a list over all ports, the code down here can help alot

protected void list() {
// get list of ports available on this particular computer,
// by calling static method in CommPortIdentifier.
Enumeration portList = CommPortIdentifier.getPortIdentifiers();

// Process the list.
while (portList.hasMoreElements()) {
CommPortIdentifier cpi = (CommPortIdentifier) portList.nextElement();
System.out.print("Port " + cpi.getName() + " ");
if (cpi.getPortType() == CommPortIdentifier.PORT_SERIAL) {
System.out.println("is a Serial Port: " + cpi);
} else if (cpi.getPortType() == CommPortIdentifier.PORT_PARALLEL) {
System.out.println("is a Parallel Port: " + cpi);
} else {
System.out.println("is an Unknown Port: " + cpi);
}
}
}

Source : java2s.com, modified as javax.comm does not exist anymore on Windows and RxTx should be used

How to Group your Radio Buttons

First add your Radio Buttons to the panel and then select all radio buttons you want to group and set their buttonGroup property (choose the group name from the combo box).

How to find an element in a List and return the index, Python

Check if value exist in a list, L ?
if value in L:
            print "list contains", value
Returns the index, where value exist in List, L :

i = L.index(value)

Array of classes in Python

b = [bullet() for x in range(50)]

Reverse a string, Python

def reverseString(s):
   """Reverses a string given to it."""
   return s[::-1]

Python string manipulation problem

In python string are immutable so if you want to just change a character in a string you get following error :

>>>> idx = 1
>>>> s1 = "pxthon"
>>>> s1[idx] = 'y'
> Traceback (most recent call last):
> File "", line 1, in ?
> TypeError: object does not support item assignment


But you can always go for a way out which is not pretty and can lead to some problems if you are not careful, but works :

s1 = s1[0:idx] + 'y' + s1[idx+1:]

How to append a dictionary in Python

groups = {'IRISH' : 'green', 'AMERICAN' : 'blue'}
# if you want to later add a new one, i.e., 'ITALIAN' : 'orange'
groups['ITALIAN'] = 'orange'

Python for Java Programmers

If you are a Java programmer and need to learn python, try this link. It is pretty useful.