import java.util.Scanner;

import java.util.ArrayList;

import java.io$.$ByteArrayOutputStream;

import java.io$.$PrintStream;

public class DataVisualizer $\{$

private final String title;

private final String authorNameColumn;

private final String numNovelsColumn;

private final ArrayList dataPoints;

public DataVisualizer$($String title, String authorNameColumn, String numNovelsColumn$)\{$

this.title $=$ title;

this.authorNameColumn $=$ authorNameColumn;

this.numNovelsColumn $=$ numNovelsColumn;

this.dataPoints $=$ new ArrayList;

$\}$

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

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

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

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

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

$")$;

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

String c$1$Header $=$ scanner.nextLine$()$;

System.out.println$("$You entered: $"+$ c$1$Header $+"$

$")$;

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

String c$2$Header $=$ scanner.nextLine$()$;

System.out.println$("$You entered: $"+$ c$2$Header $+"$

$")$;

DataVisualizer dv $=$ new DataVisualizer$($title$,$ c$1$Header, c$2$Header$)$;

boolean done $=$ false;

do $\{$

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

String input $=$ scanner.nextLine$()$;

if $($input$.$equals$("1"))\{$

done $=$ true;

$\}$ else $\{$

try $\{$

if $(!$input.contains$(","))\{$

throw new Exception$("$Error: No comma in string.

$")$;

$\}$

if $($input$.$lastIndexOf$(".")$ input.indexOf$(","))\{$

throw new Exception$("$Error: Too many commas in input.

$")$;

$\}$

String$[]$ dataArray $=$ input.split$(",")$;

String author $=$ dataArray$[0].$trim$()$;

int novelQty $=$ Integer.parseInt$($dataArray$[1].$trim$())$;

System.out.println$("$Data string:: $"+$ author$)$;

System.out.println$("$Data interger: $"+$ novelQty"

$")$;

$)$;

dv$.$dataPoints.add$($new DataPoint$($author$,$ novelQty$))$;

$\}$ catch $($NumberFormatException nfe$)\{$

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

$")$;

$\}$ catch $($Exception e$)\{$

System.out.println$($e$.$getMessage$())$;

$\}$

$\}$

$\}$ while $(!$done$)$;

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

$\}$

private void printTable$()\{$

System.out.printf$("$

$\%-33$s$\%$

$"$ title$)$;

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

$",$ authorNameColumn, numNovelsColumn$)$;

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

for $($DataPoint d : dataPoints$)\{$

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

$",$ d$.$author, d$.$novelQty$)$;

$\}$

$\}$

private void printHistogram$()\{$

for $($DataPoint d : dataPoints$)\{$

System.out.printf$("\%20$s $",$ d$.$author$)$;

for $($int i $=0$; i $$ d$.$novelQty; i$++)\{$

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

$\}$

System.out.println$()$;

$\}$

$\}$

@Override

public String toString$()\{$

ByteArrayOutputStream os $=$ new ByteArrayOutputStream$()$;

PrintStream standardOut $=$ System.out;

PrintStream stringOut $=$ new PrintStream$($os$)$;

System.setOut$($stringOut$)$;

printTable$()$;

System.out.println$()$;

printHistogram$()$;

System.out.flush$()$;

System.setOut$($standardOut$)$;

return os$.$toString$()$;

$\}$

private static class DataPoint $\{$

private final String author;

private final int novelQty;

public DataPoint$($String author, int novelQty$)\{$

this.author $=$ author;

this.novelQty $=$ novelQty;

$\}$

$\}$

$\}$ can anyone help me fix my eroors