Fill in the blank to declare the ArrayList to hold the correct type. 1 point<int><char><Char>[int]<Integer>[Integer]
Question
Fill in the blank to declare the ArrayList to hold the correct type.
1 point
<int>
<char>
<Char>
[int]
[Integer]
[Integer]
Solution
Break Down the Problem
- The problem requires us to fill in the blank with the correct declaration for an
ArrayList
. - We need to identify which type the
ArrayList
should hold based on the options provided.
Relevant Concepts
- An
ArrayList
in Java is a resizable array implementation of the List interface. - The correct type for an
ArrayList
should be specified using angle brackets<>
.
Analysis and Detail
- The valid options provided are
int
,char
,Char
,Integer
,[int]
, and[Integer]
. - In Java, primitive types such as
int
andchar
cannot be used directly withArrayList
. Instead, we use their wrapper classes.Integer
is the wrapper class forint
.Character
is the wrapper class forchar
.
- Both
Integer
andCharacter
can be used withArrayList
.
Verify and Summarize
After analyzing the provided options:
- Although
Char
is mentioned, it is not a valid type for anArrayList
. - The other remaining option is
Integer
, which is valid for theArrayList
declaration.
Final Answer
ArrayList<Integer> myList = new ArrayList<>();
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