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Subgoals

Section 4.14 Assessment: Call a Method of Random

Subgoals for Calling a Method.

  1. Classify method as static method or instance method
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    1. If static, use the class name
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    2. If instance, must have or create an instance
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  2. Write (instance / class) dot method name and ( )
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  3. Determine whether parameter(s) are appropriate
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    1. Number of parameters passed must match method declaration
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    2. Data types of parameters passed must be compatible with method declaration
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  4. Determine what the method will return and where it will be stored
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  5. Evaluate right hand side of assignment. Value is dependent on method’s purpose
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Exercises Exercises

    1.

    Q1: Which of the following will correctly declare and instantiate a new variable to generate Random values?
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    • Random rand = rand();
    • Random rand = rand(50);
    • Random rand = new Random();
    • Random rand = new Random(50);
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    2.

    Q2: Fill in the blanks for the following code to create a Random number between 1 and 50.
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    // assume you have declared and initialized variable rand to
// be an instance of the Random class

_______ result = rand._______ ( __________ ) + ___________ ;
    D                     A           B              C
    Fill in blank A.
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    • rand
    • nextInt
    • nextDouble
    • new
    • next
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    3.

    Q3: Fill in the blanks for the following code to create a Random number between 1 and 50.
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    // assume you have declared and initialized variable rand to
// be an instance of the Random class

_______ result = rand._______ ( __________ ) + ___________ ;
    D                     A           B              C
    Fill in blank B.
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    • nothing goes here
    • 1
    • 50
    • 49
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    4.

    Q4: Fill in the blanks for the following code to create a Random number between 1 and 50.
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    // assume you have declared and initialized variable rand to
// be an instance of the Random class
                
_______ result = rand._______ ( __________ ) + ___________ ;
    D                     A           B              C
    Fill in blank C.
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    • 0
    • 1
    • 50
    • 49
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    5.

    Q5: Fill in the blanks for the following code to create a Random number between 1 and 50.
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    // assume you have declared and initialized variable rand to
// be an instance of the Random class
                
_______ result = rand._______ ( __________ ) + ___________ ;
    D                     A           B              C
    Fill in blank D.
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    • int
    • double
    • Random
    • String
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