2.1.1. ObjUse-WE1-P1

Subgoals for using objects (creating instances)

1. Declare variable of appropriate class datatype.

2. Assign to variable: keyword new, followed by class name, followed by ().

3. Determine whether parameter(s) are appropriate (API)

   1. Number of parameters

   2. Data types of the parameters

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ObjUse-WE1-P1

Q1: 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);

Q2: 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);

Q3: 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);

Q4: 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);

public class main{ public static void main(String args[]){ } }

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