a) Define a class named Customer that holds private fields for a customer ID num

Question

a) Define a class named Customer that holds private fields for a customer ID number, last name, first name, and credit limit. Include four public functions that each set one of the four fields. Do not allow any credit limit over $10,000. Include a public function that displays a Customer’s data. Write a main() function in which you declare a Customer, set the Customer’s fields, and display the results. Save the file as Customer.java.

b) Write a main() function that declares an array of five Customer objects. Prompt the user for values for each Customer, and display all five Customer objects. Save the file as Customer2.java.

Explanation / Answer

Question a:

Customer.java

package a3;

public class Customer {
   private int iD;
   private String lastName;
   private String firstName;
   private int creditLimit;
  
   public Customer(){
      
   }

   public int getiD() {
       return iD;
   }

   public void setiD(int iD) {
       this.iD = iD;
   }

   public String getLastName() {
       return lastName;
   }

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

   public String getFirstName() {
       return firstName;
   }

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

   public int getCreditLimit() {
       return creditLimit;
   }

   public void setCreditLimit(int creditLimit) {
       if(creditLimit <= 10000){
       this.creditLimit = creditLimit;
       }
       else{
           System.out.println("Can not be added to credit limit more than 10000");
       }
   }
   public static void main(String a[]){
       Customer c = new Customer();
       c.setFirstName("Suresh");
       c.setiD(111);
       c.setLastName("Murapaka");
       c.setCreditLimit(5000);
       System.out.println("******************************************");
       System.out.println("First Name: "+c.getFirstName());
       System.out.println("Last Name: "+c.getLastName());
       System.out.println("ID: "+c.getiD());
       System.out.println("Credit Limit: "+c.getCreditLimit());
   }
  
}

Output:

******************************************
First Name: Suresh
Last Name: Murapaka
ID: 111
Credit Limit: 5000

Question b:

Customer2.java

import java.util.Scanner;

public class Customer2 {
   private int iD;
   private String lastName;
   private String firstName;
   private int creditLimit;
  
   public Customer2(){
      
   }

   public int getiD() {
       return iD;
   }

   public void setiD(int iD) {
       this.iD = iD;
   }

   public String getLastName() {
       return lastName;
   }

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

   public String getFirstName() {
       return firstName;
   }

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

   public int getCreditLimit() {
       return creditLimit;
   }

   public void setCreditLimit(int creditLimit) {
       if(creditLimit <= 10000){
       this.creditLimit = creditLimit;
       }
       else{
           System.out.println("Can not be added to credit limit more than 10000");
       }
   }
   public static void main(String a[]){
       Customer2 cust[] = new Customer2[5];
       Scanner scan = new Scanner(System.in);
      
       for(int i=0; i<cust.length; i++){
           cust[i] = new Customer2();
           System.out.println("Enter the first name: ");
           String firstName = scan.next();
           System.out.println("Enter the last name: ");
           String lastName = scan.next();
           System.out.println("Enter the ID: ");
           int id = scan.nextInt();
           System.out.println("Enter the credit limit: ");
           int creditLimit = scan.nextInt();
          
           cust[i].setFirstName(firstName);
           cust[i].setiD(id);
           cust[i].setLastName(lastName);
           cust[i].setCreditLimit(creditLimit);
       }
       for(int i=0; i<cust.length; i++){
       System.out.println("******************************************");
       System.out.println("First Name: "+cust[i].getFirstName());
       System.out.println("Last Name: "+cust[i].getLastName());
       System.out.println("ID: "+cust[i].getiD());
       System.out.println("Credit Limit: "+cust[i].getCreditLimit());
       }
   }
  
}

Output:

Enter the first name:
Suresh
Enter the last name:
Murapaka
Enter the ID:
111
Enter the credit limit:
1000
Enter the first name:
Sekhar
Enter the last name:
Murapaka
Enter the ID:
222
Enter the credit limit:
2000
Enter the first name:
Anshu
Enter the last name:
Murapaka
Enter the ID:
333
Enter the credit limit:
3000
Enter the first name:
Revathi1
Enter the last name:
Kella
Enter the ID:
4000
Enter the credit limit:
5000
Enter the first name:
AAAA
Enter the last name:
BBBB
Enter the ID:
5555
Enter the credit limit:
6000
******************************************
First Name: Suresh
Last Name: Murapaka
ID: 111
Credit Limit: 1000
******************************************
First Name: Sekhar
Last Name: Murapaka
ID: 222
Credit Limit: 2000
******************************************
First Name: Anshu
Last Name: Murapaka
ID: 333
Credit Limit: 3000
******************************************
First Name: Revathi1
Last Name: Kella
ID: 4000
Credit Limit: 5000
******************************************
First Name: AAAA
Last Name: BBBB
ID: 5555
Credit Limit: 6000

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