string split using java

tokens -word,paragraph,sentences
delimiter -" " | "-" | ", " | "6"


String str = "one-two-three";

String[] temp;


String delimiter = "-";


temp = str.split(delimiter);


for(int i =0; i < temp.length ; i++)

System.out.println(temp[i]);

-------------------------------------------------------------------------------------------
note: IMPORTANT : Some special characters need to be escaped while providing them as

delimiters like "." and "|".



str = "one.two.three";

delimiter = "\\.";

temp = str.split(delimiter);

for(int i =0; i < temp.length ; i++)

System.out.println(temp[i]);



/*
#
Using second argument in the String.split() method, we can control the maximum
#
number of substrings generated by splitting a string.
# */


temp = str.split(delimiter,2);

for(int i =0; i < temp.length ; i++)

System.out.println(temp[i]);

output

one
two
three
------
one
two.three

Compiling a Simple Program with directory structure

One source file, Hello.java, defines a class called greetings.Hello

C:> dir
greetings/
C:> dir greetings
Hello.java

package greetings;

public class Hello {
   public static void main(String[] args) {
       for (int i=0; i < args.length; i++) {
           System.out.println("Hello " + args[i]);
       }
   }
}
C:> javac greetings\Hello.java
C:> dir greetings
Hello.class   Hello.java
C:> java greetings.Hello thiyagu karthik
Hello thiyagu
Hello karthik

Compiling Multiple Source Files

C:> javac greetings\*.java

Copy one file to another using java File,BufferedReader,BufferedWriter

This example reads text files using the classes FileReader, BufferedReader, FileWriter, and BufferedWriter.

import java.io.*;
import java.util.*;

public class CopyTextFile {

  public static void main(String args[]) {
      //... Get two file names from use.
      System.out.println("Enter a filepath to copy from, and one to copy to.");
      Scanner in = new Scanner(System.in);

      //... Create File objects.
      File inFile  = new File(in.next());  // File to read from.
      File outFile = new File(in.next());  // File to write to

      //... Enclose in try..catch because of possible io exceptions.
      try {
          copyFile(inFile, outFile);

      } catch (IOException e) {
          System.err.println(e);
          System.exit(1);
      }
  }


  //=============================================================== copyFile
  // Uses BufferedReader for file input.
  public static void copyFile(File fromFile, File toFile) throws IOException {
      BufferedReader reader = new BufferedReader(new FileReader(fromFile));
      BufferedWriter writer = new BufferedWriter(new FileWriter(toFile));

      //... Loop as long as there are input lines.
      String line = null;
      while ((line=reader.readLine()) != null) {
          writer.write(line);
          writer.newLine();   // Write system dependent end of line.
      }

      //... Close reader and writer.
      reader.close();  // Close to unlock.
      writer.close();  // Close to unlock and flush to disk.
  }


  //=============================================================== copyFile2
  // Uses Scanner for file input.
  public static void copyFile2(File fromFile, File toFile) throws IOException {
      Scanner freader = new Scanner(fromFile);
      BufferedWriter writer = new BufferedWriter(new FileWriter(toFile));

      //... Loop as long as there are input lines.
      String line = null;
      while (freader.hasNextLine()) {
          line = freader.nextLine();
          writer.write(line);
          writer.newLine();   // Write system dependent end of line.
      }

      //... Close reader and writer.
      freader.close();  // Close to unlock.
      writer.close();  // Close to unlock and flush to disk.
  }
}

File, BufferedReader,BufferedWriter using java

File fromFile=new File("myfile.txt");
File toFile=new File("myout.txt");


BufferedReader br=new BufferedReader(new FileReader(fromFile));
BufferedWriter bw=new BufferedWriter(new FileWriter(toFile));

String line = null;
while ((line=br.readLine()) != null) {
bw.write(line);
bw.newLine(); // Write system dependent end of line.
}

br.close();
bw.close();

Behavior of PuTTY pscp recursive directory copy different from that of scp?

if you want to copy
the entire "temp" directory to a server (Red Hat Enterprise Linux 4)
using pscp from PuTTY 0.60:

C:\temp\dir1\a.txt
C:\temp\dir2\b.txt


Scenario 1: if there is a trailing slash (or backslash) in the source
path, only the content of "temp" is copied:

C:\>pscp -r temp/ karthik@xxxxxxxxxxxx:/home/karthik/test/

On the server:

/home/karthik/test/dir1/a.txt
/home/karthik/test/dir2/b.txt


Scenario 2: if there is no trailing slash in the source path, the
entire "temp" is copied:

C:\>pscp -r temp michael@xxxxxxxxxxxx:/home/karthik/test/

On the server:

/home/karthik/test/temp/dir1/a.txt
/home/karthik/test/temp/dir2/b.txt


Doing a similar action from a Linux machine to the same server, with
or without the trailing slash, the result of scenario 2 is obtained.

.properties or .ini file read and write using java

[user.properties]

DBuser=anonymous
DBpassword=&8djsx
DBlocation=bigone

--------------------------------------------------------------------
class ReadandWrite {
public static void main(String args[]) {
ReadandWrite props = newReadandWrite();
props.readit();
props.writeit();

}

public void readit() {
try{
Properties p = new Properties();
p.load(new FileInputStream("user.properties"));
System.out.println("user = " + p.getProperty("DBuser"));
System.out.println("password = " + p.getProperty("DBpassword"));
System.out.println("location = " + p.getProperty("DBlocation"));
p.list(System.out);
}
catch (Exception e) {
System.out.println(e);
}
}

public void writeit() {
 try{
   Properties p = new Properties();
   p.load(new FileInputStream("user.properties"));
   p.list(System.out);
   // new Property
   p.put("today", new Date().toString());
   // modify a Property
   p.put("DBpassword","foo");
   FileOutputStream out = new FileOutputStream("myuser.properties");
   p.save(out, "/* properties updated */");
   }
 catch (Exception e) {
   System.out.println(e);
   }
 }

}

java best way to do program

public class ReadandWrite {

public static void main(String[] args) {

new ReadandWrite().readIt();
new ReadandWrite().writeIt();
}


private void readIt()
{
try {

}catch(){ }
}

private void writeIt()
{
try {

}catch(){}
}

} //end of the class