Answered: Question: Display all the names of a…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Test Case 3

Enter a length\n
11(ENTER)
Names of length 11\n
Lindi Ekins\n
Adriana Bru\n
Linet Greep\n
Rich Yakovl\n
Roy Garrard\n
Alex Fillon\n
Inge Adrain\n
7 results\n

----------------------------------------------------------------------

Test Case 4

Enter a length\n
12 (ENTER)
Names of length 12\n
Sabrina Digg\n
Howie Royson\n
Bronny Blues\n
Murdoch Vase\n
Ryley Chmiel\n
Brand Hallam\n
Kippy Baudet\n
Tate Stainer\n
Lindie Freke\n
9 results\n

========================================================

MY code

import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;

public class TEST {
public static void main(String[] args)
{
Scanner kb = new Scanner(System.in);
System.out.println("Enter a length");
int length = kb.nextInt();
System.out.println("Names of length " + length);

ArrayList<String> names = new ArrayList<>();

try {
DataInputStream input = new DataInputStream(new FileInputStream("names.dat"));

boolean go = true;

while (go)
{
int currentLength=0;
try
{
StringBuffer bf = new StringBuffer();
//read integer
currentLength = (int) input.readByte();
for(int i=0;i<currentLength;i++) {
//read character
char ch = (char) input.readByte();
if(currentLength==length) {
bf.append(ch);
}
}
if(currentLength==length) {
System.out.println(bf.toString());
names.add(bf.toString());
}

} catch(EOFException e)
{
go = false;
}
}
input.close();
}
catch (IOException e)
{
e.printStackTrace();
}
finally {
System.out.println(names.size() + " results");
}
}
}

----------------------------------------------------------------------------------------

NOTE: The output to my Code is-

Enter a length
9
Names of length 9
0 results

(I don't know where the error is, Names should be outputted in Rows between "Names of length #" and " # results.")

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