Question

• I'm a beginner Computer Science student and I found a interesting project that I cannot seem to figure out the code for. I have the other classes created like pokemonTrainer and pokemonGymLeader that have constructors that take have parameters fName, lName, trainerID.
  For example: pokemonTrainer (String fName, String lName, int trainerID)
  
  I want to write a program that has a method called readFromFile that reads a text file called pokemon1.txt. The program should be able to read each line and create objects of the specific type.
  
• After that, if a line is successfully read it should return a string called trainerRecord
  
• I also want A boolean method called createPlayer that has the parameter trainerRecord creates a player object (based on if they are either a trainer or a gym leader) and adds player to a ArrayList called Allplayers. It also throws an exception if player is not a trainer or a gym leader. The method returns true if the player was created successful or false otherwise.
  For example: if (trainer_or_gym = trainer) {
  pokemonTrainer PT = new pokemonTrainer
  
• Then another method called writeToFile should retrieve the information from the Allplayers arraylist and writes the specific object as a comma delimited text file. Each players data is one line.

pokemon1.txt contents:

fname lname trainerID trainer_or_gym   gender    year gymBadges_or_opponents_beate

ash ketchum 01234 trainer male junior 8

misty water 2345 gym female senior 11

brock rock 3457 gym male senior 10

Jesse rocket 01235 trainer female Sophomore 4

If you need information, please let me know !

Answer 1

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

public class ObjectIOExample {

private static final String filepath="C:\\Users\\test\\Desktop\\pokemon1.txt";
ArrayList<Player> AllPlayers;

public ObjectIOExample() {
this.AllPlayers = new ArrayList<Player>;
}
  
boolean createPlayer(String trainerRecord)
{
Player p = new Player(trainerRecord);
AllPlayers.add(p);
if (trainerRecord.compareToIgnoreCase("trainer")!=0 || trainerRecord.compareToIgnoreCase("gym leader")!=0)
{
ArithmeticException e = new ArithmeticException("test");
throw e;
}
  
  
if(p!=null)
return true;
else
return false;
}
  
public static void main(String args[]) {

ObjectIOExample objectIO = new ObjectIOExample();

//Read object from file
pokemonTrainer st = (pokemonTrainer) objectIO.ReadObjectFromFile(filepath);
System.out.println(st.trainerRecord); //the string trainerRecord should be present in the class as a data member.
  
System.out.println(createPlayer(st.trainerRecord));
}
public void WriteObjectToFile() {
try {
for (int i=0; i<AllPlayers.size(); i++)
{
Player p = AllPlayers.toArray(i);
  
           FileOutputStream fos = new FileOutputStream(filepath);
           ObjectOutputStream oos = new ObjectOutputStream(fos);
           // write object to file
           oos.writeObject(p);
           System.out.println("Done");
           // closing resources
           oos.close();
           fos.close();
       } }catch (IOException e) {
           e.printStackTrace();
       }
}

public Object ReadObjectFromFile(String filepath) {

try {

FileInputStream fileIn = new FileInputStream(filepath);
ObjectInputStream objectIn = new ObjectInputStream(fileIn);

Object obj = objectIn.readObject();

System.out.println("The Object has been read from the file");
objectIn.close();
  
return obj;

} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
}

the code is dependent on other code. therefore no output.

COMMENT DOWN FOR ANY QUERIES AND,

LEAVE A THUMBS UP IF THIS ANSWER HELPS YOU.