import java.util.Scanner;

import java.util.ArrayList;

import java.util.PrintStream;

import java.io$.$ByteArrayOutputStream;

public class DataVisualizer $\{$

private final String title;

private final String authorNameColumn;

private final String numNovelsIsColumn;

private final ArrayList dataPoints;

public DataVisualizer$($String t$,$ String h$1,$ String h$2)$

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

String author;

String$[]$ dataArray;

boolean done $=$ false;

String input;

Int novelQty;

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$)$;

do $\{$

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

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

$")$;

dataArray $=$ input.split$(",")$;

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

novelQTy $=$ Interger.parseInt$($dataArray$[1].$trim$())$;

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

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

$")$

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

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

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

$")$;

$\}$ catch $($Execption 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$|\%23$s

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

$\}$

$\}$

$/*$ Type your code here. $*/$

$\}$

$\}$

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$()$;

$\}$

$\}$

public String toString$()\{$

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

printStream standardOut $=$ System.out;

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

System.setOut $=$ new PrintStream$($os$)$;

System.setOut$($stringOut$)$;

printTable$()$;

System.out.println$()$;

printHistogram$()$;

System.out.println$()$;

System.out.flush$()$;

System.out.setOut$($standardOut$)$;

return os$.$toString$()$;

$\}$

$\}$ can anyone help correct my code