Re: How to call a function with an enum like argument

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.help
Date:
Mon, 12 Jan 2009 14:12:39 -0800 (PST)
Message-ID:
<508b9df3-a303-4efa-8684-e5f5be5a355a@z28g2000prd.googlegroups.com>
Wojtek wrote:

It sounded like the OP wanted to pass the entire enum:


You mean the entire set of values, I assume.

  doSomethingWith( SomeEnum );

which needs to be
  doSomethingWith( EnumSet.<SomeEnum> allOf(SomeEnum.class) );


That is not the only way to pass all the values. One could also use

  doSomethingWith( SomeEnum.values() );

(Strictly speaking, the EnumSet version doesn't need to specify the
'<SomeEnum>' as type inference will take care of that.)

<sscce>
package eegee;

import java.util.EnumSet;

enum Foo { FOO, BAR, BAZ; }

/** Fooeynum. */
public class Fooeynum
{
    Foo foo = Foo.BAR;

    void doSomethingWith( Foo [] vals )
    {
        System.out.println( "using values" );
        for ( Foo val : vals )
        {
            System.out.println( val.toString() );
        }
    }

    void doSomethingWith( EnumSet<?> vals )
    {
        System.out.println( "using EnumSet" );
        for ( Object val : vals )
        {
            System.out.println( val.toString() );
        }
    }

    /** Main method.
     * @param args <code>String []</code> command line arguments.
     */
    public static void main( String [] args )
    {
        Fooeynum fooey = new Fooeynum();
        System.out.println();
        fooey.doSomethingWith( Foo.values() );

        System.out.println();
        fooey.doSomethingWith( EnumSet.allOf( Foo.class ));
    }
}
</sscce>
Output:

using values
FOO
BAR
BAZ

using EnumSet
FOO
BAR
BAZ

--
Lew

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