Write a Person class. A Person has properties of name and age. You construct a Person object by providing the name and age in that order. We want to be able to get and set the name. We want to be able to get the age and to increase the age by 1 when the person has a birthday. What will the object need to remember? name and age - those are the instance variables. Person class has this constructor : public Person (String theName, int theAge) - Constructs a new person with the given name and age. Remember that the job of the constructor is to initialize the instance variables It has these methods. public String getName() - Gets the name of this Person public int getAge() - Gets the age of this Person public void setName(String newName) - Sets the new name for this Person public void haveBirthday() - Adds one to this Person's age The methods and constructor are provided as stubs in the starter file. A stub has a method header and a body with no implementation. The stub for an accessor returns 0 for numbers or null for objects like strings. A stub for a mutator method has no body at all. A class with stubs for methods will compile, but it does not yet behave correctly. You still need to supply implementation and the correct return values. The idea is that you can implement one method at a time and test it since the class will compile. This technique is frequently used in development of applications.

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

Write a Person class. A Person has properties of name and age. You construct a Person object by providing the name and age in that order. We want to be able to get and set the name. We want to be able to get the age and to increase the age by 1 when the person has a birthday.

What will the object need to remember? name and age - those are the instance variables.

Person class has this constructor :

public Person (String theName, int theAge) - Constructs a new person with the given name and age. Remember that the job of the constructor is to initialize the instance variables

It has these methods.

public String getName() - Gets the name of this Person
public int getAge() - Gets the age of this Person
public void setName(String newName) - Sets the new name for this Person
public void haveBirthday() - Adds one to this Person's age

The methods and constructor are provided as stubs in the starter file. A stub has a method header and a body with no implementation.

The stub for an accessor returns 0 for numbers or null for objects like strings.
A stub for a mutator method has no body at all.

A class with stubs for methods will compile, but it does not yet behave correctly. You still need to supply implementation and the correct return values. The idea is that you can implement one method at a time and test it since the class will compile. This technique is frequently used in development of applications.

```java
public class Person
{
/**
* Constructs a new person with the given name and age
* @param theName the name of this Person object
* @param theAge the age of this Person object
*/
public Person (String theName, int theAge)
{
}

/**
* Gets the name of this Person
* @return the name of this person
*/
public String getName()
{
return null;
}

/**
* Gets the age of this Person
* @return this person's age
*/
public int getAge()
{
return 0;
}
}
```

### Explanation:

This Java code defines a basic `Person` class with a constructor and two methods. The `Person` class includes:

1. **Constructor:**
- `Person (String theName, int theAge)`: Initializes a new `Person` object with a name and age.

2. **Methods:**
- `getName()`: This method is meant to return the name of the person but currently returns `null`.
- `getAge()`: This method is intended to return the age of the person but currently returns `0`.

The class is defined but not fully implemented, as the `getName()` and `getAge()` methods need actual logic to return the appropriate values.

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