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Question about the task

Archiver (part 12)

Java Multithreading, Level 7, Lesson 15

Resolved

I have tried to format it in so many different ways but it is still not working.

Today we'll prepare to implement ZipContentCommand. It will be responsible for getting an archive's contents. The archive's contents are compressed files and folders, but we're interested in knowing not only the names of the archive's objects, but also their size before and after compression, their compression ratio, and the compression method used.
We'll create a FileProperties class that will be responsible for the properties of each file in the archive. Out set of properties consists of the following: file name, file size before and after compression, and compression method.
1. Create the FileProperties class
2. Add the following private instance variables to it:
2.1. String name - The file name
2.2. long size - The size in bytes
2.3. long compressedSize - The size after compression in bytes
2.4. int compressionMethod - The compression method
3. Add getters for them
4. Add a FileProperties(String name, long size, long compressedSize, int compressionMethod) constructor
5. Add a long getCompressionRatio() method that will calculate the compression ratio as: 100 - ((compressedSize * 100) / size)
6. Override the String toString() method so that it returns a String formatted as follows:
"name size KB (compressedSize KB) compression: compressionRatio%" if the file size is greater than 0. Otherwise, it should only return the file name. For example, a directory might have a size of 0. Don't forget to convert bytes to kilobytes. Note that the number of bytes in a kilobyte isn't the same as the number of grams in a kilogram. Nor is it the same as the number of chips in that bag... Hmm, maybe it's time for me to grab a snack…

Requirements:

You need to create a FileProperties class in the root of the task.
The FileProperties class must have String name, long size, long compressedSize, and int compressionMethod fields.
The FileProperties class must have the a FileProperties(String name, long size, long compressedSize, int compressionMethod) constructor.
Getters must be created for all of the fields in FileProperties.
The FileProperties class must contain a public long getCompressionRatio() method that calculates the file's compression ratio.
The FileProperties class's toString method must be implemented according to the task conditions.

package com.codegym.task.task31.task3110.command; import com.codegym.task.task31.task3110.ConsoleHelper; import com.codegym.task.task31.task3110.ZipFileManager; import java.nio.file.Path; import java.nio.file.Paths; public abstract class ZipCommand implements Command { @Override public void execute() throws Exception { } public ZipFileManager getZipFileManager() throws Exception { ConsoleHelper.writeMessage("enter the full path to the archive"); Path path = Paths.get(ConsoleHelper.readString()); return new ZipFileManager(path); } }

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Niklas Braun

Level 33 , Freiburg, Germany

24 June 2020, 07:42

I got it.