Conversion of string variable to stringProperty

Question

I am using javafx.
I have to convert a variable of Object type to StringProperty type.

Object v = "var";
StringProperty var = (StringProperty) v;

I am not getting any compile time error. But java.lang.ClassCastException shows up.
Thanks

Object v = "var"; StringProperty var = (StringProperty) var; ... var doesn't exist yet, try with: Object v = "var"; StringProperty var = (StringProperty) v; — Stultuske, Nov 24 '17 at 14:30
I have tried this thing but getting java.lang.ClassCastException error. @Stultuske — Akansha Gautam, Nov 24 '17 at 14:44
See https://stackoverflow.com/questions/380813/downcasting-in-java — James_D, Nov 26 '17 at 02:14

score 5 · Answer 1 · answered Nov 24 '17 at 14:33

5

You cannot cast an Object containing a String value to a StringProperty.

But you can instantiate a StringProperty from an Object containing a String:

  Object v = "var";
  StringProperty var = new SimpleStringProperty((String) v);

answered Nov 24 '17 at 14:33

DeiAndrei

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score 1 · Answer 2 · answered Nov 24 '17 at 15:19

Why assign a String value to an Object? , I suggest

    String v = "var";
    StringProperty = new SimpleStringProperty(v);

or

    Object v = "var"; // assignment may come from elsewhere
    StringProperty var;
    if (v instanceof String) {
        var = new SimpleStringProperty((String) v);
    }

    else {
        //.. doSomethingElse 
    }

this is done just to avoid any kind of exception

Conversion of string variable to stringProperty

2 Answers2