При запуске программы с параметрами "-u id productName price quantity"
должна обновится информация о товаре в файле.
Требование задачи не выполнено.package com.javarush.task.task18.task1828;
/*
Прайсы 2
*/
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Solution {
private static List<String> list;
private static String fileName;
private static String[] argsArray;
private static boolean validArgs;
public static void main(String[] args) throws IOException {
argsArray = args;
startWork();
}
private static void startWork() throws IOException {
Scanner sc = new Scanner(System.in);
list = fileToList(fileName = sc.nextLine());
switch (argsArray[0]){
case "-u":
if (argsArray.length == 5) updateString();
break;
case "-d":
if (argsArray.length == 2) deleteString();
break;
case "-c":
if (argsArray.length == 4) createString();
break;
}
if (!validArgs) System.out.println("Ошибка аргументов");
}
private static List<String> fileToList(String filename) throws IOException {
FileInputStream fileStream = new FileInputStream(filename);
BufferedReader reader = new BufferedReader(new InputStreamReader(fileStream, "Windows-1251"));
List<String> list = new ArrayList<>();
while(reader.ready()){
list.add(reader.readLine());
}
reader.close();
return list;
}
private static void listToFile() throws IOException {
FileOutputStream fileStream = new FileOutputStream(fileName);
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(fileStream, "Windows-1251"));
int countRN = 0;
for (String str : list){
writer.write(str);
if (++countRN < list.size())writer.write("\r\n");
}
writer.close();
}
private static void createString() throws IOException {
validArgs = true;
list.add(getMaxListId() + 1 + concatArgs());
listToFile();
}
private static void updateString() throws IOException {
validArgs = true;
list.set(getStringIdInList(), concatArgs());
listToFile();
}
private static void deleteString() throws IOException {
validArgs = true;
list.remove(getStringIdInList());
listToFile();
}
private static String concatArgs(){
StringBuilder str = new StringBuilder();
int[] concatLength = {0, 8, 30, 8, 4};
for (int i = 1; i < argsArray.length; i++) {
str.append(concatStr(argsArray[i], concatLength[i]));
}
return str.toString();
}
private static String concatStr(String str, Integer count){
if (str.length() > count) str = str.substring(0, count);
else if (str.length() < count){
StringBuilder spases = new StringBuilder();
spases.append(str);
for (int i = 0; i < count - str.length(); i++) {
spases.append(" ");
}
str = spases.toString();
}
return str;
}
private static int getStringIdInList(){
Integer listId = null;
for (String str : list){
if (Integer.parseInt(argsArray[1]) == Integer.parseInt(str.substring(0, 8).trim())){
listId = list.indexOf(str);
break;
}
}
return listId;
}
private static int getMaxListId(){
int index, maxIndex = 0;
try {
for (String str : list) {
if ((index = Integer.parseInt(str.substring(0, 8).trim())) > maxIndex) maxIndex = index;
}
}catch (NumberFormatException e){
System.out.println("Не верный формат файла!");
}
return maxIndex;
}
}