Pretty JSON Writer

For this homework assignment, you will create a class that outputs various tree collections as "pretty" JSON objects or arrays to file. Use the \t tab character for indentation, and use line separators between elements. For example, a "pretty" JSON array looks like:

[
	1,
	2,
	3
]

Note that there is no comma after the last element in the array. Objects look like:

{
	"one": 1,
	"two": 2,
	"three": 3
}

Note that strings and keys are always in " quotation marks, but numbers are not. A nested object looks like:

{
	"one": [
		1
	],
	"two": [
		1,
		2
	],
	"three": [
		1,
		2,
		3
	]
}

Use UTF8 when writing your files. See the Javadoc comments in the template code for additional details.

Requirements

The official name of this homework is PrettyJSONWriter. This should be the name you use for your Eclipse Java project and the name you use when running the homework test script.

See the Homework Guides for additional details on homework requirements and submission.

Hints

Below are some hints that may help with this homework assignment:

• Eclipse has built-in file comparison functionality. It can show you exactly how your file output differs from the expected output (even if its just a trailing space at the end of a line).

• If you directly call write() an int or Integer, it will often be seen as a character code. For example, 65 is the character code for A. If you want to actually write the digits 65 to file, convert to a String object first. For example, try running this:

  PrintWriter writer = new PrintWriter(System.out);
  Integer i = 65;
  writer.write(i);
  writer.flush();
  

  Compare that output to:

  PrintWriter writer = new PrintWriter(System.out);
  Integer i = 65;
  writer.write(i.toString());
  writer.flush();
  

  Note this is not a problem for most print() and println() methods, so it depends on what you use to write to file.

• The official JSON documentation can be a little difficult to parse. There are many other tutorials out there.

You are not required to use these hints in your solution. There may be multiple approaches to solving this homework.