ktprezes

The `fsck` command (file system check) works as a kind of _wrapper_ for file-system-type-dependent specialized commands, 
and the options allowed MAY VARY depending of the file system type...
For example:
  - for `fat32` file system the `fsck.vfat` is used, and the `-c N` option selects the `DOS codepage`,
    and the `-t` option tests for bad clusters
  - for `ext4` file system the `e2fsck` is used, and checking for bad blocks requires the `-c` (read-only test) option
    or the `-cc` (read/non-destructive-write test) option - and the `badblocks` command is used then under the hood
  - some linux systems contain the `fsck.ntfs` command, but some don't. And it seems the `ntfsfix` command 
    doesn't offer the `bad blocks` check, and the `badblocks` command lists the bad bocks found, but apparently doesn't 
    update the `bad blocks list` of the device

ktprezes

import pandas as pd

# suppose we have a simple 'stocks' dataframe:
stocks = pd.read_csv('http://bit.ly/smallstocks')

"""# stocks
         Date   Close    Volume Symbol
0  2016-10-03   31.50  14070500   CSCO
1  2016-10-03  112.52  21701800   AAPL
2  2016-10-03   57.42  19189500   MSFT

ktprezes

import kotlin.collections.ArrayDeque

// version #1 - the shortest implementation
// fun checkPalindrome(word: String): Boolean = word.reversed() == word

// version #2 - 'pure stack' implementation
/*
fun checkPalindrome(word: String): Boolean {
    if (word.isBlank())
        return false

ktprezes

// package some_kotlin_utils

/**
 * handles the 'end of stream (EOF) case' - e.g. when the user presses "Ctrl-D" instead of typing a string;
 * in this case returns the passed default value (e.g. "") instead of throwing an exception as 'plain' readln() does
 *
 *  @param default String       value returned when exception occurred
 *  @param printErrMsg Boolean  when true prints the message connected with an exception to 'stderr'
 *
 *  @return the user-entered string or the passed default value when an exception occurred

ktprezes

import utils.XMLResourceBundle
import utils.XMLResourceBundleControl
import java.util.*

fun main() {
    val resBndl1 = ResourceBundle.getBundle("props", Locale.forLanguageTag("pl"), XMLResourceBundleControl())
    println(resBndl1.getString("app_name")    // prints: "Moja apka"
    
    val resBndl2 = XMLResourceBundle.getBundle("props")   // gets default Locale
    println(resBndl2.getString("prop1")       // prints: "Example 1"

ktprezes

package test;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.ResourceBundle;

public class TestClass {

ktprezes

import java.util.Calendar;
import java.util.GregorianCalendar;


class GregorianCalendarPlayground1 {
    public static void main(String[ ] args) {
        Calendar gregCal = new GregorianCalendar();

        // wrong date, but the class in default 'lenient' mode should maintain this
        gregCal.set(0, Calendar.DECEMBER, 31);

ktprezes

to troubleshoot the log4j (ver1.*) it was enough to provide the:
    -Dlog4j.debug 
option to the JVM, e.g.: 
    java -Dlog4j.debug -jar test.jar
    
the equivilent option for log4j2 is:
    -Dlog4j2.debug
or:
    -Dorg.apache.logging.log4j.simplelog.StatusLogger.level=trace
    

ktprezes

```kotlin

const val HEX_LOWERCASE_DIGITS = "0123456789abcdef"
const val HEX_UPPERCASE_DIGITS = "0123456789ABCDEF"
const val HEX_DIGITS = "0123456789ABCDEFabcdef"


// ======================================================================================
// ByteArray and UByteArray 'toChars' extension functions
//

ktprezes

val string: String = "abcd"
val splitString: List<String> = string.map { it.toString() }

/*
EXPLANATION:
A) In Java, the output of the code:
        String str = "abcd";
        String[] splitString = str.split("");
        System.out.println(Arrays.toString(splitString));
        System.out.println(splitString[0].getClass());