Here is the code

import java.awt.image.BufferedImage;

import java.io.IOException;

import javax.imageio.ImageIO;

public class ReadingImage

{

public void getImage()

{

try

{

BufferedImage image =

ImageIO.read(getClass().getResource(”Sunset.jpg”));

// Do something with the image.

} catch (IOException e)

{

e.printStackTrace();

}

}

public static void main(String[] args)

{

ReadingImage ri = new ReadingImage();

ri.getImage();

}

}

import javax.imageio.ImageIO;

import java.awt.image.*;

import java.io.IOException;

import java.awt.image.BufferedImage;

public class ReadImageDemo

{

public void displayImage()

{

try

{

BufferedImage imageSrc =

ImageIO.read(getClass().getResource(”Corsa.jpg”));

// Do whatever you wanna do with this image.

} catch (IOException exception)

{

exception.printStackTrace();

}

}

public static void main(String argum[])

{

ReadImageDemo readImageDemo  = new ReadImageDemo();

readImageDemo. displayImage();

}

}

In this sample code we pass the zip file name as an argument/parameter in the command line argument .

To unzip, create object byte stream and give the size of an array perceiving the length of the text in the file

import java.io.*;

import java.util.zip.*;

public class UnZipObjectSample {

public static void main(String arguments[]) {

try {

BufferedOutputStream bufferedOutputStream = null;

ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(

new FileInputStream(arguments[0])));

ZipEntry zipEntry;

while ((zipEntry = zipInputStream.getNextEntry()) != null) {

int counter;

int initial = 0;

byte text[] = new byte[900];

bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(”sampleOUT.txt”),

900);

while ((counter = zipInputStream.read(text, initial, 900)) != -1) {

bufferedOutputStream.write(text, initial, counter);

}

//flushing and closing bufferedOutputStream

bufferedOutputStream.flush();

bufferedOutputStream.close();

}

} catch (Exception exception) {

//handle generic exceptions

exception.printStackTrace();

}

}

}

import java.io.*;

import java.util.zip.*;

public class UnZipObjectSample {

public static void main(String arguments[]) {

try {

BufferedOutputStream bufferedOutputStream = null;

ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(

new FileInputStream(arguments[0])));

ZipEntry zipEntry;

while ((zipEntry = zipInputStream.getNextEntry()) != null) {

int counter;

int initial = 0;

byte text[] = new byte[900];

bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(”sampleOUT.txt”),

900);

while ((counter = zipInputStream.read(text, initial, 900)) != -1) {

bufferedOutputStream.write(text, initial, counter);

}

//flushing and closing bufferedOutputStream

bufferedOutputStream.flush();

bufferedOutputStream.close();

}

} catch (Exception exception) {

//handle generic exceptions

exception.printStackTrace();

}

}

}

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

public class FilesZippingSampleCode {

public static void main(String argum[]) {

try {

String sourceFile = “sampleFile.txt”;

String targetZip = “zipME.zip”;

ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(

targetZip));

FileInputStream fileInputStream = new FileInputStream(sourceFile);

// This is to put an entry in the Zip output stream

zipOutputStream.putNextEntry(new ZipEntry(sourceFile));

int size = 0;

byte[] bufferByte = new byte[1024];

// This allows to read a file from beginning till end of file and

// write it in a zip output stream

while ((size = fileInputStream.read(bufferByte, 0, bufferByte.length)) > 0) {

zipOutputStream.write(bufferByte, 0, size);

}

zipOutputStream.closeEntry();

//Close the fileInputStream

fileInputStream.close();

// Close zipOutputStream

zipOutputStream.close();

} catch (IOException iOException) {

iOException.printStackTrace();

}

}

}

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

public class FilesZippingSampleCode {

public static void main(String argum[]) {

try {

String sourceFile = “sampleFile.txt”;

String targetZip = “zipME.zip”;

ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(

targetZip));

FileInputStream fileInputStream = new FileInputStream(sourceFile);

// This is to put an entry in the Zip output stream

zipOutputStream.putNextEntry(new ZipEntry(sourceFile));

int size = 0;

byte[] bufferByte = new byte[1024];

// This allows to read a file from beginning till end of file and

// write it in a zip output stream

while ((size = fileInputStream.read(bufferByte, 0, bufferByte.length)) > 0) {

zipOutputStream.write(bufferByte, 0, size);

}

zipOutputStream.closeEntry();

//Close the fileInputStream

fileInputStream.close();

// Close zipOutputStream

zipOutputStream.close();

} catch (IOException iOException) {

iOException.printStackTrace();

}

}

}

Specify the ip address of the machine instead of localhost to get the MAC address of the specified ip address machine

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.net.SocketException;

import java.net.UnknownHostException;

public class MACAddressExample {

public static void main(String arguments[]) {

try {

// To obtain internet address

InetAddress inetaddress = InetAddress.getLocalHost();

// InetAddress inetaddress = InetAddress.getByName(”10.11.583.26″);

/*

* Retrieve the current host’s network interfacea and start reading

* the hardware device address

*/

NetworkInterface networkInterface = NetworkInterface

.getByInetAddress(inetaddress);

if (networkInterface != null) {

byte[] MACAddress = networkInterface.getHardwareAddress();

if (MACAddress != null) {

/*

* obtain the array of Media access control address and

* convert it into hexadecimal value as 00-19-D1-17-78-9E

*/

for (int loop = 0; loop < MACAddress.length; loop++) {

System.out.format(”%02X%s”, MACAddress[loop],

(loop < MACAddress.length – 1) ? “-” : “”);

}

} else {

System.out.println(”Following address nor exists/found”);

}

} else {

System.out.println(”Network interface for ”

+ “nor exists/found for ” + inetaddress);

}

} catch (UnknownHostException unknownHostException) {

unknownHostException.printStackTrace();

} catch (SocketException socketException) {

socketException.printStackTrace();

}

}

}

To accomplish this we use SimpleDateFormat which can be imported as  java.text.SimpleDateFormat which by default extends java.text.DateFormat abstract class..

import java.util.Date;

import java.text.ParseException;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

public class StringToDateConversion {

public static void main(String argu[]) {

DateFormat dateFormat = new SimpleDateFormat(”MM/dd/yy”);

try {

Date todaysDate = dateFormat.parse(”01/01/2010″);

System.out.println(”Date Today : ” + dateFormat.format(todaysDate));

} catch (ParseException parseException) {

parseException.printStackTrace();

}

}

}

import java.util.Date;

import java.text.ParseException;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

public class StringToDateConversion {

public static void main(String argu[]) {

DateFormat dateFormat = new SimpleDateFormat(”MM/dd/yy”);

try {

Date todaysDate = dateFormat.parse(”01/01/2010″);

System.out.println(”Date Today : ” + dateFormat.format(todaysDate));

} catch (ParseException parseException) {

parseException.printStackTrace();

}

}

}

See the below code for better understanding

import java.util.Collections;

import java.util.*;

public class EmptyCollections {

public static void main(String args[]) {

//Empty collection object

List list = Collections.EMPTY_LIST;

Set set = Collections.EMPTY_SET;

Map map = Collections.EMPTY_MAP;

// Below are for the type-safe, use this for type-safe

List s = Collections.emptyList();

Set l = Collections.emptySet();

Map d = Collections.emptyMap();

}

}

import java.util.Collections;

import java.util.*;

public class EmptyCollections {

public static void main(String args[]) {

//Empty collection object

List emptyList = Collections.EMPTY_LIST;

Set emptySet = Collections.EMPTY_SET;

Map emptyMap = Collections.EMPTY_MAP;

// Below are for the type-safe, use this for type-safe

List list1 = Collections.emptyList();

Set set1 = Collections.emptySet();

Map map1 = Collections.emptyMap();

}

}

Ternary operator functions as if condition evaluation returns true, first value is returned else second value after the colon is returned

Try this code below….

public class TernaryOperatorExample {

public static void main(String arge[]) {

int firstValue = 500;

int secondValue = 700;

int minimum = firstValue < secondValue ? firstValue : secondValue;

int minimumValue;

if (firstValue < secondValue) {

minimumValue = firstValue;

} else {

minimumValue = secondValue;

}

int maximumValue = firstValue > secondValue ? firstValue : secondValue;

int absoluteValue = firstValue < 0 ? -firstValue : firstValue;

System.out.println(”Miimum     = ” + minimum);

System.out.println(”Minimum Value = ” + minimumValue);

System.out.println(”Maximum Value      = ” + maximumValue);

System.out.println(”Absolute Value     = ” + absoluteValue);

}

}

public class TernaryOperatorExample {

public static void main(String arge[]) {

int firstValue = 500;

int secondValue = 700;

int minimum = firstValue < secondValue ? firstValue : secondValue;

int minimumValue;

if (firstValue < secondValue) {

minimumValue = firstValue;

} else {

minimumValue = secondValue;

}

int maximumValue = firstValue > secondValue ? firstValue : secondValue;

int absoluteValue = firstValue < 0 ? -firstValue : firstValue;

System.out.println(”Miimum     = ” + minimum);

System.out.println(”Minimum Value = ” + minimumValue);

System.out.println(”Maximum Value      = ” + maximumValue);

System.out.println(”Absolute Value     = ” + absoluteValue);

}

}

Have a look at the below code.. try it out, quite interesting

Here we used static field min() and max() methods of Math class without creating an instance for the class, since the class “ import static java.lang.Math.min; import static java.lang.Math.max; is imported

import static java.lang.Math.min;

import static java.lang.Math.max;

import static java.lang.System.out;

import java.util.Date;

public class ImportStaticExample {

public static void main(String[] args) {

int minimumValue = min(10,20);

int maximumValue = max(10,20);

out.println(”minimumValue: “+minimumValue);

out.println(”maximumValue: “+maximumValue);

out.println(”Date today: ” + new Date());

}

}

import static java.lang.Math.min;

import static java.lang.Math.max;

import static java.lang.System.out;

import java.util.Date;

public class ImportStaticExample {

public static void main(String[] args) {

int minimumValue = min(10,20);

int maximumValue = max(10,20);

out.println(”minimumValue: “+minimumValue);

out.println(”maximumValue: “+maximumValue);

out.println(”Date today: ” + new Date());

}

}

Java for each loop will execute faster through the collection iterator. It executes faster for objects within the iterator than the generic for loop

Sample code Illustrated below

import java.util.*;

public class ForEachExample {

public static void main(String args[]) {

List colors = new ArrayList();

colors.add(”RED”);

colors.add(”BLUE”);

colors.add(”GREEN”);

colors.add(”YELLO”);

colors.add(”VOILET”);

for (Iterator iterator = colors.iterator(); iterator.hasNext();) {

String name = (String) iterator.next();

//returns the first character of the string in the collection object

System.out.println(”Character”+name.charAt(0));

//returns the string in the iterator object

System.out.println(”Color:”+name);

}

}

}

import java.util.*;

public class ForEachExample {

public static void main(String args[]) {

List colors = new ArrayList();

colors.add(”RED”);

colors.add(”BLUE”);

colors.add(”GREEN”);

colors.add(”YELLO”);

colors.add(”VOILET”);

for (Iterator iterator = colors.iterator(); iterator.hasNext();) {

String name = (String) iterator.next();

//returns the first character of the string in the collection object

System.out.println(”Character”+name.charAt(0));

//returns the string in the iterator object

System.out.println(”Color:”+name);

}

}

}

Here is the best illustrated example

enum Days {

SUNDAY,MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY

}

public class EnumOrdinalExample {

public static void main(String[] args) {

//Give you the ordinal value of the enumeration constant.

//Ordinal numbering starts from 0 to the n-1 values.

System.out.println(”SUNDAY : ” + Days.SUNDAY.ordinal());

System.out.println(”TUESDAY: ” + Days.TUESDAY.ordinal());

System.out.println(”THURSDAY : ” + Days.THURSDAY.ordinal());

}

}

enum Days {

SUNDAY,MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY

}

public class EnumOrdinalExample {

public static void main(String[] args) {

//Give you the ordinal value of the enumeration constant.

//Ordinal numbering starts from 0 to the n-1 values.

System.out.println(”SUNDAY : ” + Days.SUNDAY.ordinal());

System.out.println(”TUESDAY: ” + Days.TUESDAY.ordinal());

System.out.println(”THURSDAY : ” + Days.THURSDAY.ordinal());

}

}

OUPTUT

SUNDAY : 0

TUESDAY: 2

THURSDAY : 4