48. Consider the following class definition. public class Rectangle private double length; private double width; public Rectangle () length = 0; width = 0 public Rectangle (double l, double w) length = l; width = w; public void set (double l, double w) length = 1; width = W; public void print () System.out.println(length + "+width); public double area () return length width; public double perimeter () return 2 * length + 2 * width; } Which of the following statements correctly instantiates the Rectangle object myRectangle? (1) myRectangle (ii) Rectangle myRectangle = new Rectangle (12.5, 6); (iii) class Rectangle myRectangle = new Rectangle (12.5, 6); = new Rectangle (12.5, 6); a. Only (i) b. Only (ii) c. Only (iii) d. Both (ii) and (iii)

48. Consider the following class definition. public class Rectangle private double length; private double width; public Rectangle () length = 0; width = 0 public Rectangle (double l, double w) length = l; width = w; public void set (double l, double w) length = 1; width = W; public void print () System.out.println(length + "+width); public double area () return length width; public double perimeter () return 2 * length + 2 * width; } Which of the following statements correctly instantiates the Rectangle object myRectangle? (1) myRectangle (ii) Rectangle myRectangle = new Rectangle (12.5, 6); (iii) class Rectangle myRectangle = new Rectangle (12.5, 6); = new Rectangle (12.5, 6); a. Only (i) b. Only (ii) c. Only (iii) d. Both (ii) and (iii)

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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Question

```plaintext
49. Consider the following class definition.

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;
}
}

Which of the following statements correctly instantiates the Cylinder object myCylinder?

(i) Cylinder myCylinder = new Cylinder(2.5, 7.3);
(ii) class Cylinder myCylinder = new Cylinder(2.5, 7.3);
(iii) myCylinder = new Cylinder(2.5, 7.3);

a. Only (i)
b. Only (ii)
c. Only (iii)
d. Both (ii) and (iii)
```

### Consider the following class definition:

```java
public class Rectangle
{
private double length;
private double width;

public Rectangle()
{
length = 0;
width = 0;
}

public Rectangle(double l, double w)
{
length = l;
width = w;
}

public void set(double l, double w)
{
length = l;
width = w;
}

public void print()
{
System.out.println(length + " " + width);
}

public double area()
{
return length * width;
}

public double perimeter()
{
return 2 * length + 2 * width;
}
}
```

### Which of the following statements correctly instantiates the `Rectangle` object `myRectangle`?

1. `myRectangle = new Rectangle(12.5, 6);`
2. `Rectangle myRectangle = new Rectangle(12.5, 6);`
3. `class Rectangle myRectangle = new Rectangle(12.5, 6);`

#### Options:

a. Only (i)
b. Only (ii)
c. Only (iii)
d. Both (ii) and (iii)

**Explanation:**
- Statement (i) is missing the type declaration for `myRectangle`.
- In statement (ii), `myRectangle` is correctly declared and instantiated.
- In statement (iii), the use of `class` is incorrect in this context.

### Correct Answer:

b. Only (ii)

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