import java.util.Scanner;

import java.util.ArrayList;

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 integer: $"+$ 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$()\{$

$\}$

private void printHistogram$()\{$

$\}$

@Override

public String 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 correct my gramlical errors