Nurhak Kaya's Software Development Blog

package readfile; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; /**  *  * @author nurhak.kaya  */ public class ReadFile {     public static void main(String[] args) {         File file = new File("text.txt");         StringBuffer sb = new StringBuffer();         BufferedReader br = null;         String text = null;         try {             br = new BufferedReader(new FileReader(file));             while ((text = br.readLine()) != null) {                 sb.append(text).append(                         System.getProperty("line.separator"));                 System.out.println(text);             }         } catch (Exception e) {         } finally {             if (br != null) {                 try {                     br.close();                 } catch (IOException ex) {                     Logger.getLogger

package writetofile; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.Writer; /**  *  * @author nurhak.kaya  */ public class WriteToFile {     public static void main(String[] args) {         File file = new File("text.txt");         String data = "This is a sample text data!";         Writer writer = null;         try {             writer = new BufferedWriter(new FileWriter(file));             writer.write(data);         } catch (Exception e) {             e.printStackTrace();         } finally {             try {                 if (writer != null) {                     writer.close();                 }             } catch (Exception e) {                 e.printStackTrace();             }         }     } }

StringTokenizer class might be very usefull especially when you read a text data from a socket. H ere is an example to show how we can use this class. package tokenizer; import java.util.StringTokenizer; /**  *  * @author nurhak.kaya  */ public class Tokenizer {     public static void main(String[] args) {         String text1 = "This is a sample text!";         String text2 = "30.01.2012";         StringTokenizer st1 = new StringTokenizer(text1);         StringTokenizer st2 = new StringTokenizer(text2, ".");         while (st1.hasMoreElements()) {             String string1 = (String) st1.nextElement();             System.out.println(" --> " + string1);         }         System.out.println("/////////////////////");         while (st2.hasMoreElements()) {             String string2 = (String) st2.nextElement();             System.out.println(" --> " + string2);         }     } }

Here is an example for getting the environmental variables on a Windows machine.  package environmentalvariables; import java.util.Iterator; import java.util.Map; import java.util.Set; /**  *  * @author nurhak.kaya  */ public class EnvironmentalVariables {     public static void main(String[] args) {         Map map = System.getenv();         Set keys = map.keySet();         Iterator iterator = keys.iterator();         while (iterator.hasNext()) {             String key = iterator.next().toString();             String value = map.get(key).toString();             System.out.println(key + " --> " + value);         }     } }