$17\mathrm{.}1$ LAB: Data visualization

$(1)$ Prompt the user for a title for data. Output the title. $(1$ pt$)$

Ex:

Enter a title for the data:

Number of Novels Authored

You entered: Number of Novels Authored

$(2)$ Prompt the user for the headers of two columns of a table. Output the column headers. $(1$ pt$)$

Ex:

Enter the column $1$ header:

Author name

You entered: Author name

Enter the column $2$ header:

Number of novels

You entered: Number of novels

$(3)$ Prompt the user for data points. Data points must be in this format: string, int. Store the information before the comma into a string

variable and the information after the comma into an integer. The user will enter $-1$ when they have finished entering data points. Output

the data points. Store the string components of the data points in an ArrayList of strings. Store the integer components of the data points in

a second ArrayList of integers. $(4$ pts$)$

Ex:

Enter a data point $(-1$ to stop input$)$:

Jane Austen, $6$

Data string: Jane Austen

Data integer: $6$

$(4)$ Perform error checking for the data point entries. If any of the following errors occurs, output the appropriate error message and prompt

again for a valid data point.

If entry has no comma

Output: Error: No comma in string. $(1$ pt$)$

If entry has more than one comma

Output: Error: Too many commas in input. $(1$ pt$)$

If entry after the comma is not an integer

Output: Error: Comma not followed by an integer. $(2$ pts$)$

Ex:

Enter a data point $(-1$ to stop input$)$ :

Ernest Hemingway $9$

Error: No comma in string.

Enter a data point $(-1$ to stop input$)$:

Ernest, Hemingway, $9$

Error: Too many commas in input.

Enter a data point $(-1$ to stop input$)$:

Ernest Hemingway, nine

Error: Comma not followed by an integer.

Enter a data point $(-1$ to stop input$)$:

Ernest Hemingway, $9$

Data string: Ernest Hemingway

Data integer: $9$

$(5)$ Output the information in a formatted table. The title is right justified with a minimum of $33$ characters. Column $1$ is left justified with a

minimum of $20$ characters. Column $2$ is right justified with a minimum of $23$ characters. $(3$ pts$)$

Ex: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$("*")$;

can anyone help me fix my errors