
CodeHS 5.8 HashMaps
Authored by Aaron Pavao
Computers
9th - 12th Grade
Used 16+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a HashMap?
a bunch of key-value pairs
a type of ArrayList
a type of 2D array
a type of 3D array
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many values can each key in a HashMap be associated with?
one
depends how you initialize the HashMap
unlimited
trick question--keys aren't associated with values in a HashMap
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these lines of code creates a HashMap called foo that has an int for keys and a String for values?
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which line of code will add a second phone number "312-423-1234" to Charles Babbage?
phonebook.put("Charles Babbage", "312-423-1234");
phonebook.put("Charles Babbage", "312-423-1234")
phonebook.put("312-423-1234", "Charles Babbage");
trick question--you can't add a second value to a key
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What will be printed to the screen when the following code is executed:
System.out.println(phonebook.get("Grace Hopper"));
"650-352-7500"
650-352-7500
+44 330 058 0058
"+44 330 058 0058"
Grace Hopper
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What do you use to access every member of a HashMap?
a for loop
a for-each loop
an array
an ArrayList
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What do you use to find out how many key-value pairs are in the HashMap named bar?
bar.size()
bar.length
bar.size
bar.length()
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