Please explain with much detail. Thank you very much

public class TwoDimArrayDemo$2\{$

public static void main$($String$[]$ args$)\{$

$//$ TODO Auto$-$generated method stub

char$[][]$ array $=$ new char$[23][10]$;

fillArray$($array$)$;

printArray$($array$)$;

$\}$

public static void fillArray$($char$[][]$ arrayOne$)\{$

for$($int i $=0$; i $<$ arrayOne.length; i$++)\{$

for$($int j $=0$; j $<$ arrayOne$[$i$].$length; j$++)\{$

arrayOne$[$i$][$j$]=($char$)(5*$Math$.$random$()+65)$;

$\}$

$\}$

$\}$

public static void printArray$($char$[][]$ arrayTwo$)\{$

for$($int i$=0$; i $<$ arrayTwo.length; i$++)\{$

for$($int j $=0$; j $<$ arrayTwo$[$i$].$length; j$++)\{$

System.out.println$($arrayTwo$[$i$][$j$]+"")$;

$\}$

System.out.println$("")$;

$\}$

$\}$

$\}$