Create a UML diagram to help design the class described in exercise 3 below.
Do this exercise before you attempt to code the solution. Think about what
instance variables will be required to describe a Baby class object; should they
be private or public? Determine what class methods are required; should they
be private or public?
3. Write Java code for a Baby class. A Baby 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 4 inclusive
(otherwise set a default value).
Give Java code for an equals method for the Baby class. Babies 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 Baby 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.
4. Test your Baby class by writing a client program which uses an array to store
information about 4 babies. That is, each of the four elements of the array
must store a Baby object.
If you have an array for baby names and another array for baby ages,
then you have missed the point of the exercise and therefore not met
the requirement of this exercise.
A Baby class object stores the required information about a Baby. So
each Baby 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 baby (name and age) and thus populate the
Baby array
b. Output the details of each baby from the array (name and age)
c. Calculate and display the average age of all babies in the array
d. Determine whether any two babies in the array are the same
As the required information for these tasks is stored in the Baby 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.
// UML Diagrm of Baby class:
===========================================
// Baby.java
public class Baby {
private String name;
private int age;
public Baby() {
this.name = "";
this.age = 0;
}
/**
* @param name
* @param age
*/
public Baby(String name, int age) {
this.name = name;
this.age = age;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name
* the name to set
*/
public void setName(String name) {
int flag = 0;
for (int i = 0; i <
name.length(); i++) {
if
(name.charAt(i) == ' ') {
flag = 1;
break;
}
}
if (!name.isEmpty() && flag
!= 1)
this.name =
name;
else
this.name =
"";
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age
* the age to set
*/
public void setAge(int age) {
if (age >= 1 && age
<= 4)
this.age =
age;
else
this.age =
0;
}
public boolean equals(Baby other) {
if (age != other.age)
return
false;
if (name == null) {
if (other.name
!= null)
return false;
} else if
(!name.equals(other.name))
return
false;
return true;
}
}
==========================================
===========================================
// Test.java
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
String name;
int age;
/*
* Creating an Scanner class object
which is used to get the inputs
* entered by the user
*/
Scanner sc = new
Scanner(System.in);
// Creating Baby class array of
size 4
Baby babies[] = new Baby[4];
for (int i = 0; i <
babies.length; i++) {
// Getting the
input entered by the user
System.out.print("Enter name of Baby#" + (i + 1) + ":");
name =
sc.next();
System.out.print("Enter age:");
age =
sc.nextInt();
// Creating an
instance of Baby class
Baby b = new
Baby(name, age);
// Assign the
Baby class instance to the array
babies[i] =
b;
}
// Calling the method
display(babies);
double avgAge =
calcAvgAgeOfAllBabies(babies);
// Displaying the average age of
all babies
System.out.println("Average age of
all babies :" + avgAge);
boolean b =
areAnyBabiesAreSame(babies);
if (b) {
System.out.println("All babies are not unique");
} else {
System.out.println("All babies are unique");
}
}
// This method will check whether any babies are
same or not
private static boolean areAnyBabiesAreSame(Baby[]
babies) {
for (int i = 0; i <
babies.length; i++) {
for (int j = i +
1; j < babies.length; j++) {
if (babies[i].equals(babies[j])) {
return true;
}
}
}
return false;
}
// This method will calculate the average age of
all babies
private static double calcAvgAgeOfAllBabies(Baby[]
babies) {
double sum = 0;
for (int i = 0; i <
babies.length; i++) {
sum +=
babies[i].getAge();
}
return sum / babies.length;
}
// This method will display each baby info
private static void display(Baby[] babies) {
for (int i = 0; i <
babies.length; i++) {
System.out.println("\nBaby#" + (i + 1) + ":");
System.out.println("Name :" + babies[i].getName() + ", Age :"+
babies[i].getAge());
}
}
}
==========================================
==============================================
Output:
=====================Could you plz rate me
well.Thank You
Create a UML diagram to help design the class described in exercise 3 below. Do this...
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