Java enum switch

Question

I have a simple enum

public enum Columns {VENDOR, ITEM};

That I am trying to extract and drive a switch code block.
What I am getting classNotFound for what appears to be the inner class for the enum, b/c it shows [class]_A$0. I thought enum was a static final and created object that I could use directly in the switch. Can someone clarify?

      colObject="VENDOR";
      for (Columns c : Columns.values()) {
        if (colObject.toUpperCase().equals(c.name())) {
          System.out.println("Got it in iteration. i= " + i + " c= " +
                             c);
          switch (c.valueOf(colObject.toUpperCase())) {
            case VENDOR: {
              System.out.println("Got it in switch case= " + c.name());
            }
            break;
            default:
              System.out.println("Fell thru.");
              break;
          }//end switch
        }//end if
      }//end for

Works for me (output is "Got it in switch case= VENDOR") - no compile time or runtime errors. Can you provide a complete SSCCE which reproduces the issue, and some additional information on the JDK version you are using? — Andreas Fester
– Andreas Fester, Commented Apr 3, 2013 at 11:39
Yes, your code as shown works (though you do need to fix that static access from a non-static context). Include the full stack trace and an SSCCE as suggested by Andreas. — Perception
– Perception, Commented Apr 3, 2013 at 11:42

BobTheBuilder · Accepted Answer · 2013-04-03 11:37:07Z

4

Try:

switch (Columns.valueOf(colObject.toUpperCase())) {

answered Apr 3, 2013 at 11:37

BobTheBuilder

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1 Comment

Andreas Fester Over a year ago

While it is true that calling a static method (valueOf()) on an object rather than on the class is bad practice, it technically does not make a difference. Both variants worked for me.

AmitG · Accepted Answer · 2013-04-04 11:04:38Z

2

you can use java.lang.Enum class. Enum class will help to convert your String "VENDOR" to enum-VENDOR

Need to add following line of code

Enum.valueOf(Columns.class, colObject))

java.lang.Enum can be used polymorphically whereas Columns(enum) cannot be used polymorphically.

Complete code

enum Columns {
    VENDOR, ITEM
}

class Test {
    public static void main(String[] args) {
        String colObject = "VENDOR";

        switch (Enum.valueOf(Columns.class, colObject)) 
        {
            case VENDOR: {
                System.out.println("Got it in switch case= VENDOR");
                break;
            }
            default:
                System.out.println("Fell thru.");
                break;
            }
    }
}

edited Apr 4, 2013 at 11:04

answered Apr 3, 2013 at 11:50

AmitG

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