Question

1. Create a UML diagram to help design the class described in Q2 below. Do this exercise before you attempt to code the solution. Think about what instance variables will be required to describe a Person class object; should they be private or public? Determine what class methods are required; should they be private or public?

2. Write Java code for a Person class. A Person has a name of type String and an age of type integer.

Supply two constructors: one will be the default constructor, that just sets default values for the name and age; the second constructor will take two parameters, a string to set the name and an integer to set the age. Also, supply methods for setting the name, setting the age, getting the name and getting the age.

The class should not contain I/O methods; input of values to the instance variables must be done with a set method or constructor, output of values from the instance variables must be done with get methods. The set method for the name instance variable should ensure that the input is not empty or contain whitespaces (otherwise set a default value). The set method for the age instance variable should validate the input to be between 1 and 99 inclusive (otherwise set a default value).

Give Java code for an equals method for the Person class. People count as being the same (i.e. equal) if their names and their ages are exactly identical (names should not be case sensitive). The method will take a Person type parameter and use the calling object (thus comparing these two objects via name and age); it should return Boolean - true or false as appropriate. Remember, if comparing Strings, you must use String comparison methods.

3. Test your Person class by writing a client program which uses an array to store information about 4 people. That is, each of the four elements of the array must store a Person object.

If you have an array for names and another array for ages, then you have missed the point of the exercise and therefore not met the requirement of this exercise.

A Person class object stores the required information about a Person. So each Person object will have its own relevant information, and thus each object must be stored in one element of the array.

The client program should:
a. Enter details for each person (name and age) and thus populate the Person array

b. Output the details of each person from the array (name and age)

c. Calculate and display the average age of all people in the array

d. Determine whether any two people in the array are the same

As the required information for these tasks is stored in the Person array, you will need to use a loop to access each array element (and use the dot notation to access the appropriate set and get methods to assign/retrieve the information).

For part d above, a nested loop is required.

Answer 1

ref  https://www.homeworklib.com/question/1626469/create-a-uml-diagram-to-help-design-the-class