Question

signature 1. Create a new NetBeans Java project. The name of the project has to be the first part of the name you write on the test sheet. The name of the package has to be testo You can chose a name for the Main class. (2p) 2. Create a new class named Address in the test Two package. This class has the following attributes: city: String-the name of the city zip: int - the ZIP code of the city street: String the street in the address number: int - the house number All these attributes are private. (2p) 3. Create retter and setter methods for the above attributes. (1) 4. Add two constructors to the class. One that can set all the fields of the class to values given as parameters and a default constructor. (1p) 5. Add a custom exception to the project. Name it wrongZipcodeException. Using this exception make sure that an address cannot be instantiated with a ZIP code less than 1. Also make it impossible to set the zip code to such a value. (3p) 6. In the main method create a new List of Addresses and add three addresses to using the data below: 1 address: 4032 Debrecen Halasz street 28 20 address: 3300 Hatvan Alma street 6 3d address: 3700 Kazincbarcika Kossuth street 40(2p) 7. Instantiate a 4 Address object using data read from the keyboard and add it to the list (3) 8. Add the following interface to your project into the test Two package): (1pl package test Two; public interface AddressListHandler public void sortBycityName(ListAddress : public void sortByZipCode(ListAddress> l): The sortByCityName method sorts the list given as parameter by the city names while the sorty ZipCodesorts by the ZIP codes 9. Implement the above interface in your project. You can choose the name of the implementing class (7p-1 for the implementing class itself, a 33 points for the methods) 10. Instantiate an instance of the class created in ex. 7. Using this instance print out the Addresses first sorted by city and then by zip code. (When printing use the format "ZIP_code - city_nane") (3p) 11. Serialize the List of addresses to a file named 'addressList.ser" (2p) 12. Add a static method to the Main class that gets a List of addresses as parameter and prints out how many addresses are in Debrecen from the list. (3p)

Answer 1

Address.java

package testTwo;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class WrongZipCodeException extends Exception{
  
   public WrongZipCodeException(String msg) {
       super(msg);       // this will invoke constructor of Exception class
   }
}

public class Address {

   private String street, city;
   private int number, zip;
  
   public Address() {
       street = "";
       city = "";
       number = 0;
       zip = 0;
   }
  
   public Address(int number, String city, String street, int zip) {
       this.street = street;
       this.city = city;
       this.number = number;
       try{
           if(zip < 1)
               throw new WrongZipCodeException("Invalid zipcode! Zipcode has to be more than 1.");
           else
               this.zip = zip;
       }catch(WrongZipCodeException ex) {
           System.out.println(ex.getMessage());
       }
   }
   public String getStreet() {
       return street;
   }
   public void setStreet(String street) {
       this.street = street;
   }
   public String getCity() {
       return city;
   }
   public void setCity(String city) {
       this.city = city;
   }
   public int getNumber() {
       return number;
   }
   public void setNumber(int number) {
       this.number = number;
   }
   public int getZip() {
       return zip;
   }
   public void setZip(int zip) {
       this.zip = zip;
   }

   public static void main(String[] args) {
      
       int num, zip;
       String street, city;
      
       Address address1 = new Address(4032, "Debrecen", "Halasz Street", 28);
       Address address2 = new Address(3300, "Hatvan", "Alma street", 6);
       Address address3 = new Address(3700, "Kazincharcika", "Kossuth street", 40);
       Scanner in = new Scanner(System.in);       // used to read input from keyboard
      
       System.out.print("Enter house number: ");
       num = in.nextInt();
       in.nextLine();
      
       System.out.print("Enter city: ");
       city = in.nextLine();
      
       System.out.print("Enter street name: ");
       street = in.nextLine();
      
       System.out.println("Enter zip code: ");
       zip = in.nextInt();
       in.nextLine();
      
       Address address4 = new Address(num, city, street, zip);
      
       // add all address objects to a list
       List<Address> myList = new ArrayList<>();
       myList.add(address1);
       myList.add(address2);
       myList.add(address3);
       myList.add(address4);
      
       // create an object of SortedAddresses
       SortedAddress sorting = new SortedAddress();
      
       // sort by city names
       sorting.sortByCityName(myList);
       System.out.println("Sorted by city name\nZip code \t City");
       for(Address a: myList)
       {
           System.out.println(a.getZip() + "\t\t" + a.getCity());
       }
      
       // sort by zip code
       sorting.sortByZipCode(myList);
      
       // print sorted address
       System.out.println("Sorted by zip code\nZip code \t City");
       for(Address a: myList)
       {
           System.out.println(a.getZip() + "\t\t" + a.getCity());
       }
      
       in.close();
   }
}

AddressListHandler.java

package testTwo;

import java.util.List;

public interface AddressListHandler {
   public void sortByCityName(List<Address> l);
   public void sortByZipCode(List<Address> l);
}

SortedAddress.java

package testTwo;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

// this automatically sorts address based on city names
class NameSorting implements Comparator<Address>{
   @Override
   public int compare(Address a1, Address a2) {
       // here is the condition of city names sorting
       return a1.getCity().compareTo(a2.getCity());
   }
}

class ZipSorting implements Comparator<Address>{
   @Override
   public int compare(Address o1, Address o2) {
       return (o1.getZip() - o2.getZip());
   }
  
}

public class SortedAddress implements AddressListHandler{
   public void sortByCityName(List<Address> l) {
       NameSorting ns = new NameSorting();
       Collections.sort(l, ns);
   }
   public void sortByZipCode(List<Address> l) {  
       ZipSorting zs = new ZipSorting();
       Collections.sort(l, zs);
   }

}

Output:

<terminated> Address [Java Application] C:\Program Files\Java\jre\bin\javaw.exe (10-Oct-2019, 9:39:35 pm) Enter house number: 23 Enter city: Atlanta Enter street name: love st Enter zip code: 12 Sorted by city name Zip code City 12 Atlanta 28 Debrecen Hatvan 40 Kazincharcika Sorted by zip code Zip code City Hatvan 12 Atlanta 28 Debrecen 40 Kazincharcika