Don Juans Troubles Don Juans Troubles Hey, Anna, how are you? Don - - PowerPoint PPT Presentation

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Don Juans Troubles Don Juans Troubles Hey, Anna, how are you? Don - - PowerPoint PPT Presentation

Dec 29, 2022 381 likes •989 views

Don Juans Troubles Don Juans Troubles Hey, Anna, how are you? Don Juans Troubles Hey, Anna, how I am are you? Magda!!! Noooo, my Precioussss... Don Juans Diary 1.0 Meet HashMap A variable type that stores values accessed

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Don Juan’s Troubles

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Hey, Anna, how are you?

Don Juan’s Troubles

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Hey, Anna, how are you? I am Magda!!!

Don Juan’s Troubles

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Noooo, my Precioussss...

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Don Juan’s Diary 1.0

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Meet HashMap Wow! Nice to meet you

  • A variable type that stores values accessed by index (key)
  • Keys are single type of object (e.g., String)
  • Keys are unique
  • Items have no order
  • Resizable
  • Has some helpful methods
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HashMap is like magic box

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HashMap is like magic box

Hey magic box, this is “Teddy”

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HashMap is like magic box

Ok, I will take care

  • f him.
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HashMap is like magic box

Hey magic box, this is “Cupcake the Unicorn”

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HashMap is like magic box

SO cute, I will take care

  • f him.
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HashMap is like magic box

Hey magic box, I want to play with “Teddy”

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HashMap is like magic box

Hey magic box, I want to play with “Teddy” Here he comes

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Don Juan’s Diary 2.0

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Key Value

Don Juan’s Diary 2.0

Day of date Name of the date

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day name

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day name July 18 Magda

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day name July 18 Magda July 19 Anna

Don Juan’s Diary 2.0

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day name July 18 Magda July 19 Anna name: Magda

Don Juan’s Diary 2.0

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day name July 18 Magda July 19 Anna

Don Juan’s Diary 2.0

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day name July 18 Magda July 19 Anna name: null

Don Juan’s Diary 2.0

No date on July 20

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HashMap Methods

map.get(key)

get value specified by key

map.put(key, value)

store pair key:value (insert new or overwrite value for existing key)

map.remove(key)

remove key-value pair, return value

map.clear()

remove the entire content

map.isEmpty()

return true if this HashMap is empty

map.containsKey(key)

return true whether this HashMap contains specified key

map.containsValue(value)

return true whether this HashMap contains specified value

map.size()

return the number of all key-value pairs

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day name July 18 Magda

Add a date

day name July 18 Magda July 19 Anna

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day name July 18 Magda

Cancel a date

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Any date at all?

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Am I busy tomorrow?

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Do I date ___?

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day name July 18 Magda

Change a date

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day name July 18 Magda July 19 Anna

Change a date

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day name July 18 Jana July 19 Anna

Change a date

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day name July 18 Jana July 19 Anna

Change a date Keys are unique!

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You shall not date twice a day!

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! ! ! ! ! ! !

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Nested collections

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day names dates

Don Juan’s Diary 3.0

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day names dates

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day names dates names: null day: July 18 name: Magda

Don Juan’s Diary 3.0

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Don Juan’s Diary 3.0

day names dates names: null day: July 18 name: Magda

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Don Juan’s Diary 3.0

names day names dates day: July 18 name: Magda

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names day names July 18 dates day: July 18 name: Magda

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day names July 18 Magda dates Magda names

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day: July 18 name: Magda

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day names July 18 Magda dates

Don Juan’s Diary 3.0

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day names July 18 Magda dates names: null day: July 19 name: Anna

Don Juan’s Diary 3.0

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day names July 18 Magda dates

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names: null day: July 19 name: Anna

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day names July 18 Magda dates

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names day: July 19 name: Anna

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day names July 18 Magda July 19 dates

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names day: July 19 name: Anna

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day names July 18 Magda July 19 Anna dates Anna names

Don Juan’s Diary 3.0

day: July 19 name: Anna

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day names July 18 Magda July 19 Anna dates

Don Juan’s Diary 3.0

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day names July 18 Magda July 19 Anna dates Magda names day: July 18 name: Jana

Don Juan’s Diary 3.0

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day names July 18 Magda July 19 Anna dates Magda names day: July 18 name: Jana

Don Juan’s Diary 3.0

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day names July 18 Magda, Jana July 19 Anna dates Magda 1 Jana names day: July 18 name: Jana

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day names July 18 Magda, Jana July 19 Anna dates Magda 1 Jana thuNames

Don Juan’s Diary 3.0

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day names July 18 Magda, Jana July 19 Anna dates Magda 1 Jana thuNames [Magda, Jana]

Don Juan’s Diary 3.0

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FINAL PROJECTS Almost there guys! You got this!

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