What is the output of the following code? Include a description of what happens. 1 class Main { public static void main(Stringt) args) { SecondClass myObject = new Secondclass(27,18); System.out.printin(myObject); 3 4 6 } 9 class FirstClass { 10 private int num; 11 12 13 public Firstclass(int num) { this.num- num; System.out.printin(*This is a statement in the FirstClass constructor"); 14 15 16 17 public string tostring() { return String.formnat (*In an object of type Firstclass: num - d", num); 18 19) 20 21 22 class SecondClass extends Firstclass { 23 24 25 private int num; 26 27 28 public Secondclass(int a, int b) { super(a); this.num- b; System.out.println(*This is a statement in the SecondClass constructor."); 29 30 public String tostring() { 31 return String.format("\s\nIn an object of type SecondClass: num - d", super.tostring(), num); 33 )
What is the output of the following code? Include a description of what happens. 1 class Main { public static void main(Stringt) args) { SecondClass myObject = new Secondclass(27,18); System.out.printin(myObject); 3 4 6 } 9 class FirstClass { 10 private int num; 11 12 13 public Firstclass(int num) { this.num- num; System.out.printin(*This is a statement in the FirstClass constructor"); 14 15 16 17 public string tostring() { return String.formnat (*In an object of type Firstclass: num - d", num); 18 19) 20 21 22 class SecondClass extends Firstclass { 23 24 25 private int num; 26 27 28 public Secondclass(int a, int b) { super(a); this.num- b; System.out.println(*This is a statement in the SecondClass constructor."); 29 30 public String tostring() { 31 return String.format("\s\nIn an object of type SecondClass: num - d", super.tostring(), num); 33 )
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:**Code Explanation and Output**
The given code is an example of Java classes and inheritance. It consists of a main class, `Main`, and two other classes: `FirstClass` and `SecondClass`. Let's break down the code step-by-step:
1. **Main Class:**
- The `main` method creates an instance of `SecondClass` with arguments `27` and `18`.
- It then prints this object using `System.out.println(myObject);`.
2. **FirstClass:**
- It contains a private integer `num`.
- The constructor `FirstClass(int num)` initializes `this.num` and prints a statement.
- The `toString` method returns a formatted string with `num`.
3. **SecondClass:**
- It extends `FirstClass`, inheriting its properties and methods.
- Contains an additional private integer `num`.
- The constructor `SecondClass(int a, int b)`:
- Calls the constructor of `FirstClass` with `super(a)` to initialize the superclass part of the object.
- Initializes its own `num` with `b`.
- Prints a statement.
- The `toString` method returns a formatted string using its own `num` and the `super.toString()` method for the `FirstClass`.
**Output Explanation:**
When the code is executed, the following statements are printed to the console:
1. "This is a statement in the FirstClass constructor"
- This line is printed when the `FirstClass` constructor is called within the `SecondClass` constructor via `super(a)`.
2. "This is a statement in the SecondClass constructor"
- This line is printed when the `SecondClass` constructor is executed.
3. "In an object of type SecondClass: num = 18, In an object of type FirstClass: num = 27"
- This is the result of calling `toString()` on `myObject`. The `toString` method in `SecondClass` is used, which calls `super.toString()` to include the `FirstClass` part.
Therefore, the complete output of the code is:
```
This is a statement in the FirstClass constructor
This is a statement in the SecondClass constructor
In an object of type SecondClass: num = 18, In an object of type FirstClass: num = 27
```
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