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Introducing properties

Java Core, Level 10, Lesson 2

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Donno what is wrong!!

In the fillInPropertiesMap method, read a file name from the console and populate the properties map with data from the file.
You can read about .properties here: http://en.wikipedia.org/wiki/.properties
Implement the logic for file IO for the properties map.

Requirements:

The fillInPropertiesMap method must read data from the console.
The fillInPropertiesMap method must create a FileInputStream, passing the read string as an argument.
The fillInPropertiesMap method should call the load method, passing the newly created FileInputStream as an argument.
The save method must store the properties map in the OutputStream object passed as an argument.
The load method must restore the state of the properties map from the InputStream object passed as an argument.

website https://en.wikipedia.org/wiki/.properties

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Dave Andrea

Level 41 , Canada

3 October 2020, 12:32

useful

line 29: I passed validation with:

Writer out = new BufferedWriter(new OutputStreamWriter(outputStream));

I also checked to make sure properties.size() > 0 before iterating through the map. Think about the logic for the load() method. You read data in and add it to the properties map. So you need to read the data and temporarily store it somewhere, then go through this data and add it to the properties map. prop.load(br) first, then iterate through the prop.keySet(), then add these vales to properties.

dhanush

Level 30 , Chennai, India

3 October 2020, 17:10

Thanks Dave! That worked, Actually i have read and googled many things about properties but not completely understood about that, want to read more and try to understand that.

Dave Andrea

Level 41 , Canada

3 October 2020, 18:21

No problem. This one took me a little while too and I'm pretty sure I read the other help questions to piece together my answer. It's not always easy to find resources that are straightforward, and Codegym often doesn't explain the tasks well enough.

Misiu

Level 41 , Gdansk, Poland

3 October 2020, 12:29

Too much "properties". Line 32: "properties" should be Map, is Properties.

dhanush

Level 30 , Chennai, India

3 October 2020, 17:11

Yeah i didn't notice that silly thing, thank you Misiu!