How to set Objects Enum type in constructor?

Question

I have following class:

public class Owner {

  private final Integer id;
  private final OwnerType type;

  public Owner(Integer iId, Enum eType) {
      this.id= iId;
      this.lastName = lName;
      this.type = eType // how should that work?
  } 

}

And

public enum OwnerType {
    HUMAN,INSTITUTION   
}

Which I am calling via:

try {
    File file = new File("resources/Owner.txt");
    Scanner fileContent = new Scanner(file);
    while (fileContent.hasNextLine()) {
            String[] person = fileContent.nextLine().split(" ");
            this.data.add(new Owner(owner[0],owner[1]));
        }
    } catch (FileNotFoundException err){
        System.out.println(err);
    }

Where Owner.txt has a format of:

ID TYPE

Like that:

1 HUMAN
2 INSTITUTION

My question is:

How can I specify the type property of my Owner Object when I am calling the following?

new Owner(owner[0],owner[1])

Firstly, can you change the name of Enum so that it's not the name of a class in the java.lang package? It will make both your code and your question much simpler. — Jon Skeet
– Jon Skeet, Commented Mar 25, 2016 at 11:18
Your "constructor" name (AccountOwner) doesn't match the class name (Owner). — Mena
– Mena, Commented Mar 25, 2016 at 11:19
Please post code that compiles, or at least, that has a compile error only in the problematic place. There is no variable named owner. And whatever array it is, it cannot match the parameters of the constructor. Why are you using Enum instead of OwnerType anyway? — RealSkeptic
– RealSkeptic, Commented Mar 25, 2016 at 11:33

Sean Patrick Floyd · Accepted Answer · 2016-03-25 12:48:55Z

2

There are two issues here.

First, the Owner's constructor should receive an OwnerType, not just any Enum:

public Owner(Integer iId, OwnerType eType) {
    this.id= iId;
    this.type = eType;
}

When parsing the input file, you could use the valueOf method to convert a string value to an OwnerType:

this.data.add
    (new Owner(Integer.parseInt(owner[0]), OwnerType.valueOf(owner[1])));

edited Mar 25, 2016 at 12:48

Sean Patrick Floyd

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answered Mar 25, 2016 at 11:34

Mureinik

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Comments

cralfaro · Accepted Answer · 2016-03-25 12:41:29Z

1

Any Enumeration object have by default the method valueOf(String key), the what this method does is search into all defined values into your enum class and return the right one if find it.

For more info keep on eye on this:

https://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html#valueOf%28java.lang.Class,%20java.lang.String%29 enter link description here

In this particular case the enum;

public enum OwnerType {
    HUMAN,INSTITUTION   
}

if we use OwnerType.valueOf("HUMAN"), will return the enum type HUMAN

Here use this:

try {
    File file = new File("resources/Owner.txt");
    Scanner fileContent = new Scanner(file);
    while (fileContent.hasNextLine()) {
        String[] person = fileContent.nextLine().split(" ");
        this.data.add(new Owner(person[0],OwnerType.valueOf(person[1])));
    }
} catch (FileNotFoundException err){
    System.out.println(err);
}

edited Mar 25, 2016 at 12:41

answered Mar 25, 2016 at 11:33

cralfaro

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1 Comment

Andy Turner Over a year ago

Please explain your answer. Code dumps without explanation are not useful.

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