A command line application developed in Java programming language. The main purpose of this project is to act as a qualification test of mastering of Java.

• Fork me and use pull request to submit changes to develop branch. Anything unclear about the feature, fire issue on github.
• You should submit your source code and pom file
• Remember this is the only place to submit your code, not by email. Tip: do some basic learning of github

Browse and modify a JSON data structure with ls,cd,cat, add, remove

• Let's say we have this address entry data structure in JSON

  {"entries":{"lilei" :{"age": 27, "mobile" : "13700000000", "address" : "Earth somewhere" }, "hanmeimei" :{"age": 26, "mobile" : "13700000001", "address" : "Earth somewhere else" } } } 

• start interactive command line application

  sh> java -jar ab.jar

  ab> _

• use ls command to list the items in current position

  ab> ls

  ab> entries

• use cd command to go to the entry like go to a directory

  ab> cd entries

  ab> ls

  ab> lilei hanmeimei

• use cat command to display th item data

  ab> cat lilei

  ab> "lilei" :{"age": 27, "mobile" : "13700000000", "address" : "Earth somewhere" }

• use add command to add new address entry to JSON

  ab> cd entries

  ab> add

  key: xiaoming

  value:{"age": 28, "mobile" : "13700000002", "address" : "Earth somewhere too" }

  address entry added

  ab> ls

  ab> lilei hanmeimei xiaoming

  Note: the key should be identical, if trying to add duplicated key, just display an error message

• use remove command to remove one or more address entries

  ab> cd entries

  ab> remove

  please give the key: xiaoming

  xiaoming was deleted from JSON

  Note: if trying to delete an non-exist key, just display an error message

• get help

  ab> !help

  then help message should be displayed, and when encoutering invalid command, help message should also be displayed.

• quit from the application

  ab> !quit

  sh> _

• project must be managed by Maven, latest version of v3

• unit test is a must

  • because we want to see how you test your application

• javadoc for public interface/class/method is a must

• Java code should be well-formatted

  • NEVER use tab for indentation

• JSON should be used as backend persistent storage

  • You are welcome to use any JSON lib you want

• ExecutorService should be used to handle commands

• Maven assembly plugin should be used to assemble the application as runable jar

  • mvn clean install, then everything should be ready, and one can find assembled application under target folder

• DO NOT store any IDE specific files into git repository

• if there is any fault in this readme, please also fix it or submit an issue