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. (D)</p>
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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. (A)</p>
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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. (A)</p>
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What is the purpose of invoking a method on an object?

<p>To ask the object to perform an action (C)</p>
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What is the relationship between a class and an object?

<p>A class is a blueprint for creating objects of the same type (B)</p>
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Which of the following statements about instantiation is correct?

<p>Instantiation is the process of creating a new instance of a class (D)</p>
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What defines the state of an object?

<p>The object's data fields (C)</p>
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What defines the behavior of an object?

<p>The object's methods (C)</p>
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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 (C)</p>
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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 (B)</p>
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Which of the following best describes the state of an object in OOP?

<p>The current values of its data fields (D)</p>
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What does the term 'behavior' refer to in the context of OOP?

<p>The methods that define the actions an object can perform (D)</p>
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Which of the following is NOT considered an example of an object in OOP?

<p>A programming language (D)</p>
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Which of the following best describes the properties that characterize a rectangle object in OOP?

<p>Width and height (C)</p>
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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 (D)</p>
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What is the purpose of using a sentinel value in a loop?

<p>To terminate the loop when a specific condition is met (B)</p>
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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 (B)</p>
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In a do-while loop, when is the loop condition evaluated?

<p>After the loop body executes (B)</p>
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What is the purpose of the initial-action in a for loop?

<p>To initialize the loop counter (A)</p>
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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 (D)</p>
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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 (D)</p>
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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 (D)</p>
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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; } (D)</p>
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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 (B)</p>
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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 (A)</p>
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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> (C)</p>
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