Running external command from java

import java.io.*;

public class ExternalCommand
{
public static void main(String args[]) throws Exception
{
String line;
OutputStream stdin = null;
InputStream stderr = null;
InputStream stdout = null;

// launch EXE and grab stdin/stdout and stderr
Process process = Runtime.getRuntime ().exec ("bc");
stdin = process.getOutputStream ();
stderr = process.getErrorStream ();
stdout = process.getInputStream ();

// "write" the parms into stdin
line = "13*3" + "\n";
stdin.write(line.getBytes() );
stdin.flush();

stdin.close();

// clean up if any output in stdout
BufferedReader brCleanUp =
new BufferedReader (new InputStreamReader (stdout));
while ((line = brCleanUp.readLine ()) != null) {
System.out.println ("[Stdout] " + line);
}
brCleanUp.close();

// clean up if any output in stderr
brCleanUp =
new BufferedReader (new InputStreamReader (stderr));
while ((line = brCleanUp.readLine ()) != null) {
System.out.println ("[Stderr] " + line);
}
brCleanUp.close();

}
}

ref: http://www.rgagnon.com/javadetails/java-0014.html

easy tabular file access with sql like command

<?
    /////////////////////////////////////////////////////
    //    Abdul Arfan 2007 Dec
    //    db file
    //    akses file jadi mirip database
    ////////////////////////////////////////////////////

    //insert(array("arfan", "1204556658", "Abdul Arfan"));
    delete(array(0=>"arfan"));
    display_all();

    ///////////////////////////
    // untuk menginsert data //
    ///////////////////////////
    function insert( $array )
    {
        $handle = fopen ( "./db.txt", "a" );

        $first =true;
        write_array($handle, $array);
    }

    ///////////////////////////
    // untuk searching data  //
    ///////////////////////////
    function select( $array_constrain )
    {
        $result = null;
        $counter=0;

        $handle = fopen ( "./db.txt", "r" );

        while($line = fgets($handle))
        {
            $array = split(",", $line);
            $masuk = true;

            if($array_constrain)
            {
                foreach ($array_constrain as $key => $value)
                {
                    if($array[$key]!=$value)
                    {
                        $masuk = false;
                    }
                }
            }

            if($masuk)
            {
                $result[$counter]=$array;
                $counter++;
            }
        }
        return $result;
    }

    function delete( $array_constrain )
    {
        $result = null;
        $counter=0;

        $handle = fopen ( "./db.txt", "r" );
        $handle2 = fopen ( "./db-temporary.txt", "w" );

        while($line = fgets($handle))
        {
            $array = split(",", $line);
            $cocok = true;

            if($array_constrain)
            {
                foreach ($array_constrain as $key => $value)
                {
                    if($array[$key]!=$value)
                    {
                        $cocok = false;
                    }
                }
            }

            if(!$cocok)
            {
                write_array($handle2, $array);
            }
        }

        fclose ($handle );
        fclose ($handle2 );

        //hapus db.txt
        $myFile = "db.txt";
        unlink($myFile);

        rename  ( "db-temporary.txt", "db.txt" );
        return $result;
    }

    function update( $array_constrain , $array_update)
    {
        $result = null;
        $counter=0;

        $handle = fopen ( "./db.txt", "r" );
        $handle2 = fopen ( "./db-temporary.txt", "w" );

        while($line = fgets($handle))
        {
            $array = split(",", $line);
            $cocok = true;

            if($array_constrain)
            {
                foreach ($array_constrain as $key => $value)
                {
                    if($array[$key]!=$value)
                    {
                        $cocok = false;
                    }
                }
            }

            if($cocok)
            {
                foreach ($array_update as $key => $value)
                {
                    $array[$key] = $array_update[$key];
                }
            }
            write_array($handle2, $array);
        }

        fclose ($handle );
        fclose ($handle2 );

        //hapus db.txt
        $myFile = "db.txt";
        unlink($myFile);

        rename  ( "db-temporary.txt", "db.txt" );
        return $result;
    }

    /**
      fungsi-fungsi tambahan
    */
    function write_array($handle, $array)
    {
        $first =true;
        foreach($array as $el)
        {
            if($first)
            {
                $total = trim($el);
                $first=false;
            }
            else
            {
                $total = $total.", ".trim($el) ;
            }
        }
        fwrite($handle, $total."\n");
    }

    /**
    * return dari ini adalah satu baris saja
    * jadi bukan bentuk tabel
    */

    function select_one( $array_constrain )
    {
        $handle = fopen ( "./db.txt", "r" );
        while($line = fgets($handle))
        {
            $array = split(",", $line);
            foreach ($array_constrain as $key => $value)
            {
                if($array[$key]==$value)
                    return $array;
            }
        }

        return null;

        fclose ($handle );
    }

    function display_all()
    {
        $result = select(null);

        echo "<table border=\"1\">";
        foreach($result as $row)
        {
            echo "<tr>";
            foreach($row as $element)
            {
                echo "<td>$element</td>";
            }
            echo "</tr>";
        }
        echo "</table>";
    }

?>

Simple Java Input and Output

import java.io.*;

public class SimpleIO
{
 public static void main(String args[])
 {
 try
 {
 BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 System.out.print("what is your name? ");
 String name = reader.readLine();
 System.out.println("hello "+name+", have a nice day");
 }
 catch(Exception e)
 {
 System.out.println("Exception occured");
 e.printStackTrace();
 }
 }
}