Question

Specifications:

This project will have two data classes and a tester class.

Design:

Create a solution for this programming task. You will need to have the following parts:

• Text file to store data between runs.
• Two classes that implement the given interfaces. You may add methods beyond those in the interfaces
• A tester class that tests all of the methods of the data classes.

Here are the interfaces for your data classes:

package project1;

import java.util.ArrayList;

public interface Person {

      

       public void setId (String id);

       public String getId ();

       public void setName (String name);  

       public String getName ();

       public void addTHING (String THING);

       public void removeTHING (String THING);

       public ArrayList<String> getTHINGs ();

       public String toString();

}

package project1;

import java.util.ArrayList;

public interface PersonDataManager {

       public void addPerson (Person p);

       public Person getPerson (String id);
       public ArrayList<String> getTHINGSDESCRIPTION (ArrayList<String> THINGs); //for this, its just a set of descriptions for THINGs (just use THINGdescription1, 2, 3 for each one and ill do the rest

       public void writeToFile ();

       public void writeToFile (String fn);

       public String toString();

}

For ace's, they are either going to be a 1 or 0 for 10 different attributes. I only need a basic skeleton for the code and can do the rest but I am struggling with the starting point

Answer 1

Try to edit code, its simple code to understand how interface will be implemented..

/*****************************Person1.java************************/

package project1;

import java.util.ArrayList;
import java.util.Iterator;

/**
* The Class Person1.
*/
public class Person1 implements Person {

   /** The id. */
   private String id;

   /** The name. */
   private String name;

   /** The things. */
   private ArrayList<String> things;

   /**
   * Instantiates a new person 1.
   *
   * @param id the id
   * @param name the name
   */
   public Person1(String id, String name) {
       super();
       this.id = id;
       this.name = name;
       things = new ArrayList<>();
   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#setId(java.lang.String)
   */
   @Override
   public void setId(String id) {

       this.id = id;
   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#getId()
   */
   @Override
   public String getId() {

       return id;
   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#setName(java.lang.String)
   */
   @Override
   public void setName(String name) {

       this.name = name;

   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#getName()
   */
   @Override
   public String getName() {

       return name;
   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#addTHING(java.lang.String)
   */
   @Override
   public void addTHING(String THING) {

       this.things.add(THING);
   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#removeTHING(java.lang.String)
   */
   @Override
   public void removeTHING(String THING) {

       Iterator<String> itr = things.iterator();
       while (itr.hasNext()) {

           String thing = itr.next();

           if (thing.equalsIgnoreCase(THING)) {

               itr.remove();
           }
       }

   }

   /*
   * (non-Javadoc)
   *
   * @see project1.Person#getTHINGs()
   */
   @Override
   public ArrayList<String> getTHINGs() {

       return things;
   }

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "Person1 [id=" + id + ", name=" + name + ", things=" + things + "]";
   }

}
/**************************************PersonData.java**********************/

package project1;

import java.io.File;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.ArrayList;

/**
* The Class PersonData.
*/
public class PersonData implements PersonDataManager {

   /** The persons. */
   private ArrayList<Person> persons;

   /**
   * Instantiates a new person data.
   */
   public PersonData() {
       persons = new ArrayList<>();
   }

   /* (non-Javadoc)
   * @see project1.PersonDataManager#addPerson(project1.Person)
   */
   @Override
   public void addPerson(Person p) {

       persons.add(p);
   }

   /* (non-Javadoc)
   * @see project1.PersonDataManager#getPerson(java.lang.String)
   */
   @Override
   public Person getPerson(String id) {

       Person actPerson = null;
       for (Person person : persons) {

           if (person.getId().equalsIgnoreCase(id)) {

               actPerson = person;
           }
       }

       return actPerson;
   }

   /* (non-Javadoc)
   * @see project1.PersonDataManager#getTHINGSDESCRIPTION(java.util.ArrayList)
   */
   @Override
   public ArrayList<String> getTHINGSDESCRIPTION(ArrayList<String> THINGs) {

       return null;
   }

   /* (non-Javadoc)
   * @see project1.PersonDataManager#writeToFile()
   */
   @Override
   public void writeToFile() {

   }

   /* (non-Javadoc)
   * @see project1.PersonDataManager#writeToFile(java.lang.String)
   */
   @Override
   public void writeToFile(String fn) throws Exception {

       Writer rw = new PrintWriter(new File(fn));
       for (Person person : persons) {

           rw.write(person.toString());
       }

   }
}
/*************************************TestPerson.java*********************/

package project1;

public class TestPerson {

   public static void main(String[] args) {
      
       Person1 person1 = new Person1("A101", "Virat");
       person1.addTHING("Thing1");
       person1.addTHING("Thing2");
       person1.addTHING("Thing3");
      
       PersonData personData = new PersonData();
      
       personData.addPerson(person1);
       personData.writeToFile("out.txt");
       System.out.println(personData.getPerson("A101"));
   }
}
/***************output***************/

Person1 [id=A101, name=Virat, things=[Thing1, Thing2, Thing3]]
/****************out.txt********************/

Person1 [id=A101, name=Virat, things=[Thing1, Thing2, Thing3]]

Please let me know if you have any doubt or modify the answer, Thanks :)