Question

Create a class called Customer that includes three pieces of information as instance variables - a firstname (type string), a last name (type string) and a credit limit (double) Your class should have a constructor that initializes the three values. a. Provide a customer that initializes these three instance variables. Validate credit limit; it must be greater than 0.0. b. Provide set and get methods for each instance variable. Validate credit limit; it must be greater than 0.0. Write a test application named CustomerTest that demonstrates class Customer's capabilities. a. Create two customer objects. b. Display each customer's first name, last nam, and credit limit. For doubles, displays two integers after the decimal points. c. Then, raise each customer's credit limit by 20%. b. Display each customer's first name, last name, and credit limit again. For doubles, display two integers after the decimal point.

Answer 1

`Hey,

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class Customer {

private String firstName;

private String lastName;

private double creditLimit;

public Customer () {
this.firstName = null;
this.lastName = null;
this.creditLimit = 0;
}

public Customer (String firstName, String lastName, double creditLimit) {
this.firstName = firstName;
this.lastName = lastName;
this.creditLimit = creditLimit;
}

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}

public double getCreditLimit() {
return creditLimit;
}
public void setCreditLimit(double creditLimit) {
if(creditLimit > 0)
this.creditLimit = creditLimit;
}



}

public class CustomerTest {

public static void main(String args[]) {
Customer cust1 = new Customer ("cust", "1", 10000);
Customer cust2 = new Customer ("cust", "2", 20000);

System.out.println("Yearly credit limit ");
System.out.println(cust1.getFirstName()+" "+cust1.getLastName()+" ---- "+String.format("%.2f",cust1.getCreditLimit()) );
System.out.println(cust2.getFirstName()+" "+cust2.getLastName()+" ---- "+String.format("%.2f",cust2.getCreditLimit()) );
//increase limit of each by 20%
cust1.setCreditLimit(cust1.getCreditLimit() * (1.0 + 20.0/100.0));
cust2.setCreditLimit(cust2.getCreditLimit() * (1.0 + 20.0/100.0));

System.out.println("Yearly credit limit ");
System.out.println(cust1.getFirstName()+" "+cust1.getLastName()+" ---- "+String.format("%.2f",cust1.getCreditLimit()) );
System.out.println(cust2.getFirstName()+" "+cust2.getLastName()+" ---- "+String.format("%.2f",cust2.getCreditLimit()));




}
}

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