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Section 2.2 ObjUse-WE1-P1
Subsection 2.2.1 Subgoals for using objects (creating instances)
Declare variable of appropriate class datatype.
Assign to variable: keyword new, followed by class name, followed by ().
-
Determine whether parameter(s) are appropriate (API)
Number of parameters
Data types of the parameters
Subsection 2.2.2 ObjUse-WE1-P1
Exercises Exercises
1.
Click on the variables (object references) in the following code
/* reads input from default - keyboard */:
Scanner: input: = new Scanner(System.in);:
/* reads input from InFile stream */:
Scanner: foo: = new Scanner(InFile);:
2.
Click on the class names (but not constructors) in the following code
/* reads input from default - keyboard */:
Scanner: input: = new Scanner(System.in);:
/* reads input from InFile stream */:
Scanner: foo: = new Scanner(InFile);:
3.
Click on the calls to the Scanner constructor in the following code
/* reads input from default - keyboard */:
Scanner: input: = new Scanner(System.in);:
/* reads input from InFile stream */:
Scanner: foo: = new Scanner(InFile);:
4.
Click on the parameters which are passed to the Scanner constructor in the following code
/* reads input from default - keyboard */:
Scanner: input: = new Scanner:(System.in:);
/* reads input from InFile stream */:
Scanner: foo: = new Scanner:(InFile:);
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