• What is Lambda Expression?
• Functional interfaces?
• Why do we need lambda expressions?

• What is a Stream?
• How streams change our way of programing and make our code better?
  • common operations on collections: using streams vs for-loop

• Given two collections of interested topics, e.g: Java Stream API, Java Concurrency, Object-Oriented Programming,...

  • one collection maintains currently intersted topics (of a person)
  • one collection contains newly updated interested topics (a person may edit their interested topics)
  • a Topic has an unique id, a name, a description

• Find out all

  • newly added interested topics
  • updated interested topics
  • deleted interested topics

• Given a list of programmers in a company
  • a Programmer has id, division, team, gender, name
• Process the list and categorize programers into divisions, as below:

{
  "division_1": [
    "Programmer 1",
    "Programmer 2",
    "Programmer 3",
    "Programmer 4"
  ],
  "division_2": [
    "Programmer 5",
    "Programmer 6",
    "Programmer 7"
  ]
}

• Process the list and categorize programers into divisions, then teams, then genders, as below:

{
  "division_1": {
    "java": {
      "male": [
        "Programmer 1",
        "Programmer 2",
        "Programmer 3"
      ],
      "female": [
        "programmer 4"
      ]
    },
    "php": {
      "male": [
        "Programmer 5, Programmer 6"
      ],
      "female": [
        "Programm 7"
      ]
    }
  }
}

Please create a github account and fork this repository and start the study and do the exercises. When you're done just send a pull/merge request to this repo.