**Question 57:** Which of the following statements would you use to declare the reference variable `secretObject` of type `Secret` and instantiate the object such that the value of the data member `x` is 7 and the value of the data member `z` is 10?- a. `Secret secretObject = new Secret(7, 10);`- b. `Secret secretObject = new Secret(10, 7);`- c. `Secret secretObject(7);`- d. `Secret.secretObject(10);`**Question 58:** How many finalizers can a class have?- a. 0- b. 1- c. 2- d. Any number**Question 59:** Which of the following words indicates an object’s reference to itself?- a. `this`- b. `that`- c. `public`- d. `protected` ## Class Definition and Instantiation Example in Java### Consider the following class definition:```javapublic class Cylinder { private double baseRadius; private double height; public Cylinder() { baseRadius = 0; height = 0; } public Cylinder(double l, double h) { baseRadius = l; height = h; } public void set(double r, double h) { baseRadius = r; height = h; } public String toString() { return (baseRadius + " " + height); } public double SurfaceArea() { return 2 * 3.14 * baseRadius * height; } public double volume() { return 3.14 * baseRadius * baseRadius * height; }}```### Question:Which of the following statements correctly instantiate the `Cylinder` object `myCylinder`?1. `Cylinder myCylinder = new Cylinder(2.5, 7.3);`2. `class Cylinder myCylinder = new Cylinder(2.5, 7.3);`3. `myCylinder = new Cylinder(2.5, 7.3);`#### Options:- a. Only (i)- b. Only (ii)- c. Only (iii)- d. Both (ii) and (iii)### Explanation:- **Option (i)** is the correct way to instantiate the `Cylinder` object, as it declares a new `Cylinder` object called `myCylinder` and initializes it using the constructor with parameters. - **Option (ii)** is incorrect because the keyword `class` is not used when declaring an object; it is used for defining a class. - **Option (iii)** is incorrect because `myCylinder` is not declared with a type, assuming it is already defined elsewhere.Therefore, the correct answer is:- **a. Only (i)**This example demonstrates basic object-oriented principles in Java such as class definition, encapsulation with private variables, constructor overloading, and object instantiation.

Note: This is a multiple-question-based problem. As per company guidelines, only the first question…

Answered: 58. How many finalizers can a class…

58. How many finalizers can a class have? - a. C. 2 d. Any number b. 1 59. Which of the following words indicates an object's reference to itself? - this c. public d. protected a. b. that

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Concept of Pointer Parameter

Pointers are the special variable that stores the variable address, instead of storing the variable value. Pointer is a powerful feature of a programming language. A pointer is mostly used to save memory space and improve execution time.

Question

## Class Definition and Instantiation Example in Java

### Consider the following class definition:

```java
public class Cylinder {
private double baseRadius;
private double height;

public Cylinder() {
baseRadius = 0;
height = 0;
}

public Cylinder(double l, double h) {
baseRadius = l;
height = h;
}

public void set(double r, double h) {
baseRadius = r;
height = h;
}

public String toString() {
return (baseRadius + " " + height);
}

public double SurfaceArea() {
return 2 * 3.14 * baseRadius * height;
}

public double volume() {
return 3.14 * baseRadius * baseRadius * height;
}
}
```

### Question:

Which of the following statements correctly instantiate the `Cylinder` object `myCylinder`?

1. `Cylinder myCylinder = new Cylinder(2.5, 7.3);`
2. `class Cylinder myCylinder = new Cylinder(2.5, 7.3);`
3. `myCylinder = new Cylinder(2.5, 7.3);`

#### Options:
- a. Only (i)
- b. Only (ii)
- c. Only (iii)
- d. Both (ii) and (iii)

### Explanation:

- **Option (i)** is the correct way to instantiate the `Cylinder` object, as it declares a new `Cylinder` object called `myCylinder` and initializes it using the constructor with parameters.

- **Option (ii)** is incorrect because the keyword `class` is not used when declaring an object; it is used for defining a class.

- **Option (iii)** is incorrect because `myCylinder` is not declared with a type, assuming it is already defined elsewhere.

Therefore, the correct answer is:

- **a. Only (i)**

This example demonstrates basic object-oriented principles in Java such as class definition, encapsulation with private variables, constructor overloading, and object instantiation.

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