CSC1208: Object Oriented Programming Techniques [JAVA] Lecture 5
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Questions and Answers

What is the value of the radius field in the yourCircle object?

  • 100.0 (correct)
  • The text does not provide enough information to determine the value of `yourCircle.radius`
  • 34.0
  • 5.0

    • What is the difference between an instance method and a static method?

  • Instance methods can be called on any object, while static methods can only be called on the class itself.
  • Instance methods can access instance variables, while static methods can only access static variables. (correct)
  • Instance methods are defined using the `static` keyword, while static methods are defined without the `static` keyword.
  • There is no difference between instance methods and static methods.

    • What is the purpose of the myCircle object?

  • The `myCircle` object is used to demonstrate the use of instance methods and instance variables.
  • The `myCircle` object is not mentioned in the text, so its purpose is unclear.
  • The `myCircle` object is used to demonstrate the creation of a new `Circle` object with a radius of 5.0. (correct)
  • The `myCircle` object is used to demonstrate the difference between instance methods and static methods.

    • What is the purpose of the yourCircle object?

    <p>The <code>yourCircle</code> object is used to demonstrate the creation of a new <code>Circle</code> object with a radius of 100.0.</p> Signup and view all the answers

    Which of the following statements is true about the getArea() method?

    <p><code>getArea()</code> is an instance method that can be called on any <code>Circle</code> object.</p> Signup and view all the answers

    What is the purpose of the name field in the Student class?

    <p>The <code>name</code> field is used to store the name of a student as a <code>String</code> object.</p> Signup and view all the answers

    What is the purpose of invoking a method on an object?

    <p>To ask the object to perform an action</p> Signup and view all the answers

    What is the relationship between a class and an object?

    <p>A class is a blueprint for creating objects of the same type</p> Signup and view all the answers

    Which of the following statements about instantiation is correct?

    <p>Instantiation is the process of creating a new instance of a class</p> Signup and view all the answers

    What defines the state of an object?

    <p>The object's data fields</p> Signup and view all the answers

    What defines the behavior of an object?

    <p>The object's methods</p> Signup and view all the answers

    In the context of object-oriented programming, what is the purpose of a class?

    <p>To serve as a blueprint for creating objects of the same type</p> Signup and view all the answers

    What is the primary purpose of object-oriented programming (OOP) according to the text?

    <p>To develop graphical user interfaces and large-scale software systems</p> Signup and view all the answers

    Which of the following best describes the state of an object in OOP?

    <p>The current values of its data fields</p> Signup and view all the answers

    What does the term 'behavior' refer to in the context of OOP?

    <p>The methods that define the actions an object can perform</p> Signup and view all the answers

    Which of the following is NOT considered an example of an object in OOP?

    <p>A programming language</p> Signup and view all the answers

    Which of the following best describes the properties that characterize a rectangle object in OOP?

    <p>Width and height</p> Signup and view all the answers

    What is the main reason for introducing object-oriented programming concepts according to the text?

    <p>To develop graphical user interfaces and large-scale software systems</p> Signup and view all the answers

    What is the purpose of using a sentinel value in a loop?

    <p>To terminate the loop when a specific condition is met</p> Signup and view all the answers

    Why is it recommended to avoid using floating-point values for equality checking in a loop control?

    <p>Floating-point values can lead to imprecise counter values and inaccurate results</p> Signup and view all the answers

    In a do-while loop, when is the loop condition evaluated?

    <p>After the loop body executes</p> Signup and view all the answers

    What is the purpose of the initial-action in a for loop?

    <p>To initialize the loop counter</p> Signup and view all the answers

    Which of the following statements about the action-after-each-iteration in a for loop is correct?

    <p>It can be a list of zero or more comma-separated statements</p> Signup and view all the answers

    What is the output of the following code snippet?

    double item = 1;
double sum = 0;
while (item != 0) {
    sum += item;
    item -= 0.1;
}
System.out.println(sum);```

    <p>The output may vary due to floating-point approximations</p> Signup and view all the answers

    What is the purpose of the java.util.Scanner object in the code snippet?

    <p>To read user input and store it in the array</p> Signup and view all the answers

    Which line of code is responsible for initializing the array with random values?

    <p>for (int i = 0; i &lt; myList.length; i++) { myList[i] = Math.random() * 100; }</p> Signup and view all the answers

    What is the purpose of the double max = myList; statement in the code?

    <p>To initialize the <code>max</code> variable with the first element of the array</p> Signup and view all the answers

    What is the purpose of the for (int i = 0; i &lt; myList.length - 1; i++) loop in the random shuffling section?

    <p>To generate a random index for swapping elements</p> Signup and view all the answers

    What is the purpose of the double temp = myList[i]; myList[i] = myList[j]; myList[j] = temp; lines in the random shuffling section?

    <p>To swap the values of <code>myList[i]</code> and <code>myList[j</code></p> Signup and view all the answers

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