Re: Unable to Overload toString for Object

From:
Ojesh Dugar <ojesh.u@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 12 Feb 2014 20:24:42 -0800 (PST)
Message-ID:
<cd1085ea-193d-4826-8308-698ba9096f6a@googlegroups.com>
On Thursday, February 13, 2014 12:27:59 AM UTC+5:30, Eric Sosman wrote:

On 2/12/2014 1:37 PM, markspace wrote:

On 2/12/2014 12:38 AM, Ojesh Dugar wrote:

Basically, I am able to access Bugzilla Webservice API through java

code(xmlrpc) and in return i get a object of <<class

java.util.HashMap>>. According to Bugzilla documentation two items

are returned, bugs and faults, both are array of hashes and I want to

access these. Thanks.


Cast to a HashMap and iterate over all of its keys.

(not tested):

// create bug

    Object createResult = rpcClient.execute("Bug.search", new

Object[]{bugMap});

       //createResult.toString();

   HashMap bugs = (HashMap)createResult;

   for( Object key : bugs.keySet() ) {

     System.out.println( "Key "+key.getClass().getName()

                       + "= "+key

                       + ", value "+ bugs.get( key ).getClass().getName()

                       + "= "+ bugs.get( key )

                 );

   }

More info here:

http://www.mkyong.com/java/how-to-loop-a-map-in-java/


     This probably won't work as written. The original post said

createResult.toString() produced "[Ljava.lang.Object;@2ee5e48a",

indicating that rpcClient.execute() returns an Object[], that

is, an array of Object references. (To those surprised that an

array of Objects is itself an Object: Someday it will all make

sense, I promise.) So what he needs to do is cast the returned

value to an Object[]:

    Object[] array = (Object[]) createResult;

... then iterate over the contents of the array:

    for (Object obj : array) {

... and then (assuming the Objects in the array are HashMaps as

advertised, or in any case *some* kind of Maps):

        Map bugs = (Map) obj;

... and *then* he can iterate over the entries, either in the

manner markspace shows or by using the key/value pairs directly:

    for (Map.Entry ent : bugs.entrySet()) {

        Object key = ent.getKey();

        Object val = ent.getValue();

        ...

--

Eric Sosman

esosman@comcast-dot-net.invalid


Object[] array = (Object[]) createResult;
this line itself gives an error.
Exception in thread "main" java.lang.ClassCastException: java.util.HashMap cannot be cast to [Ljava.lang.Object;
    at XMLRPC.Testing.main(Testing.java:64)

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