public class DataVisualizer

$\{$

$//$ Main method

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

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$//$ Create an object of Scanner class

Scanner scan $=$ new Scanner$($System$.$in$)$;

$//$ Take the title for data

System.out.println$("$Enter a title for the data:"$)$;

String title $=$ scan.nextLine$()$;

System.out.println$("$You entered: $"+$ title$)$;

System.out.println$()$;

$//$ Take the column $1$ header

System.out.println$("$Enter the column $1$ header:"$)$;

String header$1=$ scan.nextLine$()$;

System.out.println$("$You entered: $"+$ header$1)$;

System.out.println$()$;

$//$ Take the column $2$ header

System.out.println$("$Enter the column $2$ header:"$)$;

String header$2=$ scan.nextLine$()$;

System.out.println$("$You entered: $"+$ header$2)$;

System.out.println$()$;

$//$ Create an array list to store names

ArrayList name $=$ new ArrayList$()$;

$//$ Create an array list to store number of novels

ArrayList numNovels $=$ new ArrayList$()$;

$//$ Loop till the user enter $-1$ to exit

while$($true$)$

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$//$ Take the data point $(-1$ to stop input$)$

System.out.println$("$Enter a data point $(-1$ to stop input$)$:$")$;

String data $=$ scan.nextLine$()$;

$//$ If the user enter $-1$

if$($data$.$equals$("-1"))$

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$//$ Exit from loop

break;

$\}$

$//$ If user enter data point

else

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$//$ Split the data point into array of string

String$[]$ tokens $=$ data.split$(",")$;

$//$ If length of strings is $1$

if$($tokens$.$length $==1)$

$//$ Print an error message

System.out.println$("$Error: No comma in string.

$")$;

$//$ If length of strings is greater than $2$

else if$($tokens$.$length $>2)$

$//$ Print an error message

System.out.println$("$Error: Too many commas in input.

$")$;

$//$ If length of string is $2$

else

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$//$ Try to convert second part into integer

try

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$//$ Convert the second string in to number

int count $=$ Integer. parseInt$($tokens$[1])$;

$//$ Add name into names list

name.add$($tokens$[0])$;

$//$ Add number of novels

numNovels.add$($count$)$;

$//$ Print string & integer

System.out.println$("$Data string: $"+$ tokens$[0])$;

System.out.println$("$Data integer: $"+$ tokens$[1])$;

System.out.println$()$;

$\}$

$//$ If the second string is not integer

catch$($NumberFormatException e$)$

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$//$ Print an error message

System.out.println$("$Error: Comma not followed by an integer.

$")$;

$\}$

$\}$

$\}$

$\}$

$//$ Print title, column $1$ & column $2$ header

System.out.printf$("\%33$s

$",$ title$)$;

System.out.printf$("\%-20$s$|\%23$s

$",$ header$1,$ header$2)$;

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

$//$ Loop to print each novels name & number of novels

for$($int i $=0$; i $<$ name.size$()$; i$++)$

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System.out.printf$("\%-20$s$|\%23$s

$",$ name.get$($i$),$ numNovels.get$($i$))$;

$\}$

System.out.println$()$;

$//$ Loop to print each novels with histigram of number of novels

for$($int i $=0$; i $<$ name.size$()$; i$++)$

$\{$

System.out.printf$("\%20$s $",$ name.get$($i$))$;

for$($int j $=0$; j $<$ numNovels.get$($i$)$; j$++)$

$\{$

System.out.printf$("*")$;

$\}$

System.out.println$()$;

$\}$

$\}$

$\}$