Write a class named Customer as: Customer - lastName: String - firstName: String

Question

Write a class named Customer as:

Customer
- lastName: String
- firstName: String
+ getLastName(): String
+ setLastName(String lastName): void
+ getFirstName(): String
+ setFirstName(String firstName): void

Using Customer class write a program that reads all customers’ name in a customers.txt file then displays all customers’ name in ascending order of lastName ( if equals lastName then sort by firstName).

Hint:

- class CustomerName implements Comparable
- Using support class Collections to sort all customers’ name.
- Using RandomAccessFile class to read customers.txt file.
- Using String.split() method to split a line into fields.

Explanation / Answer

import java.util.*;
class Customer implements Comparable {
    private String lastname;
    private String firstname;
    public String getLastName()
    {
       return lastname;
    }
    public String getFirstName()
    {
       return firstname;
    }
    public void setLastName(String lname)
    {
lastname=lname;
    }
    public void setFirstName(String fname)
    {
firstname=fname;
    }
    public int compareTo(Object obj) {
           
      if (obj instanceof Customer) {
               
         Customer cust = (Customer) obj;
         if (this.lastname.compareTo(cust.getLastName())>0)
            return 1;
         else if (this.lastname.compareTo(cust.getLastName())==0)
          {
   if (this.firstname.compareTo    (cust.getFirstName())>0)
  {
   return 1;
  }
          }
          else
            return -1;
        }
            return 0;
      }

    public static void main(String[] args) {
      List<Customer> list = new ArrayList<Customer>();
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
   System.out.print("Enter File name : ");
   String str = in.readLine();
   File file = new File(str);
   if(!file.exists())
   {
    System.out.println("File does not exist.");
    System.exit(0);
   }
   try{
    //Open the file for both reading and writing
   RandomAccessFile rand = new RandomAccessFile(file,"r");
   rand.seek(0);
   String name = rand.readLine();
   while(name != null)
  {
   Customer c= new Customer();
   String[] temp;
   temp= name.split(" ");
   c1.setFirstname(temp[1]);
          c1.setLastname(temp[0]);
   String name = rand.readLine();
   list.add(c);
  }

      Collection.sort(list);
      for(int i=0;i<list.size();i++)
      {
  System.out.println(list.get(i).getLastName()+" "+list.get(i).getFirstName());
}
    }
   

}

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.