CODEWITHSUNDEEP
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user1091524
user1091524

Reputation: 865

Java Enum with numeric values

New to Java, but I've done some .Net programming. I'm wondering if Java has the equivalent of a .Net eum? Below is an example. I know Java has enum, but you can't assign values to it.

In .Net I could do an enum with values. When used in code I don't have to comment or, when writing new procedures, remember what 0, 1, 2, and 3 represent. I could also use the enum as parameter type in a constructor and then pass AccessType.Full, for instance, in as an argument.

How can I duplicate this is Android Studio?

Public Class Delete

    Private Enum AccessType
        Full = 0
        ReadOnly = 1
        Delete = 2
        Add = 3
    End Enum

    Private Sub DeleteIem(sItem As String)
        If User.Access = AccessType.Delete Or User.Access = AccessType.Full Then
            'delete something here
        Else
            MsgBox("You do not have access to delete these items.", vbInformation
        End If
    End Sub

End Class

In Android Studio I have the if{} block below.

if (AllLists.get(pos).Access == 0) {
    MsgText += getResources().getString(R.string.info_cat_shared_no) + "\n";
}
else if (AllLists.get(pos).Access == 1){
    MsgText += getResources().getString(R.string.info_cat_shared_edit) + "\n";
}
else if (AllLists.get(pos).Access == 2){
    MsgText += getResources().getString(R.string.info_cat_shared_no_edit) + "\n";
}

It would turn the code in to below and I wouldn't have to always be checking what 0, 1 ,2, & 3 represent. I looked up Java enums and they are just a list of string, which doesn't work for this, or at least not that I can think to implement it.

if (AllLists.get(pos).Access == AccessType.Full) {
    MsgText += getResources().getString(R.string.info_cat_shared_no) + "\n";
}
else if (AllLists.get(pos).Access == AccessType.ReadOnly){
    MsgText += getResources().getString(R.string.info_cat_shared_edit) + "\n";
}
else if (AllLists.get(pos).Access == AccessType.Delete){
    MsgText += getResources().getString(R.string.info_cat_shared_no_edit) + "\n";
}

Upvotes: 1

Views: 5081

Answers (2)

GGizmos
GGizmos

Reputation: 3775

Actually, java enums are a pretty handy object. You can add properties, even methods, if you want. To assign properties, just add the value as an argument to the contructor as in:

public enum AccessType {
    Full(0),
    ReadOnly(1),
    Delete(2),
    Add(3);
    private final int code;

    AccessType(int code) {
        this.code = code
    }

    public int getCode() {
        return this.code;
    }
}

Upvotes: 4

Über Lem
Über Lem

Reputation: 363

Please have a look at this page from Oracle: http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html

You would have something like this for your ENUM (code untested):

public enum AccessType
{
    Full(0),
    ReadOnly(1),
    Delete(2),
    Add(3);

    AccessType(int type)
    {
        this.type = type;
    }
}

But the constructor by itself may not be necessary since you can use a switch case like this:

switch(AllLists.get(pos).Access)
{
    case Full:
        // ...
        break;

    case ReadOnly:
        // ...
        break;

    case Delete:
        // ...
        break;

    case Add:
        // ...
        break;
}

Upvotes: 1

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