toString equivalent for array

[Ph. Barthelemy]

Hi,

Sorry for asking a lame question, but I googled to find the answer and
did not find any.

is there a nice toString method for array ?
something that will concatenate the toString output of each element of
the array ?

calling the toString on a array just output gibberish ( an pointer
maybe ), but does not have the result explained above.

My problem is that I upcast objects of several Classes to Object ( the
java root class ). then I call toString on the Objects. the result is
not nice for arrays...
can I do something generic that will handle array as well as Classes ?

How can I does it ?

TIA,
--Philippe

 

[Paul Lutus]

Hi,

Sorry for asking a lame question, but I googled to find the answer and
did not find any.

is there a nice toString method for array ?
something that will concatenate the toString output of each element of
the array ?

Why not write one? This is why computer languages allow programmers to
change what they do.

calling the toString on a array just output gibberish

It's not gibberish.

( an pointer
maybe ), but does not have the result explained above.

My problem is that I upcast objects of several Classes to Object ( the
java root class ). then I call toString on the Objects. the result is
not nice for arrays...

Define "not nice". What do you want? What do you get? How do they differ?

 

[Thomas Fritsch]

Hi,

Sorry for asking a lame question, but I googled to find the answer and
did not find any.

is there a nice toString method for array ?
something that will concatenate the toString output of each element of
the array ?

calling the toString on a array just output gibberish ( an pointer
maybe ), but does not have the result explained above.

My problem is that I upcast objects of several Classes to Object ( the
java root class ). then I call toString on the Objects. the result is
not nice for arrays...
can I do something generic that will handle array as well as Classes ?

How can I does it ?

TIA,
--Philippe

May be, instead of a plain array you want to use an ArrayList, which has
this kind of a "nice" toString method.
See
<http://java.sun.com/j2se/1.4.2/docs/api/java/util/AbstractCollection.html#toString()>
and <http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html>

 

[Oscar kind]

May be, instead of a plain array you want to use an ArrayList, which has
this kind of a "nice" toString method.
See
<http://java.sun.com/j2se/1.4.2/docs/api/java/util/AbstractCollection.html#toString()>
and <http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html>

Or even: Arrays#asList(Object[]) combined with the toString() method.

 

[Ph. Barthelemy]

Why not write one? This is why computer languages allow programmers to
change what they do.

I do not want to reinvent the wheel over again. I assumed what I want to
do must have been done somewhere.

It's not gibberish. okay, agreed.

Define "not nice". What do you want? What do you get? How do they differ?

As I said, nice to me would be :
thanks,
--Philippe

 

[Ph. Barthelemy]

May be, instead of a plain array you want to use an ArrayList, which has
this kind of a "nice" toString method.
See
<http://java.sun.com/j2se/1.4.2/docs/api/java/util/AbstractCollection.html#toString()>
and <http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html>

Thanks, I'll look into it.

--P

 

[Elliott Back]

Hi,

Sorry for asking a lame question, but I googled to find the answer and
did not find any.

is there a nice toString method for array ?
something that will concatenate the toString output of each element of
the array ?

calling the toString on a array just output gibberish ( an pointer
maybe ), but does not have the result explained above.

My problem is that I upcast objects of several Classes to Object ( the
java root class ). then I call toString on the Objects. the result is
not nice for arrays...
can I do something generic that will handle array as well as Classes ?

How can I does it ?

TIA,
--Philippe

Just add a method in a wrapper class like:

public String toString(){
String temp = "";

for(int i = 0; i < this.object.length - 1; i++){
temp += i + ", ";
}

temp += this.object[this.object.length - 1];
return temp;
}

 

[John Davison]

is there a nice toString method for array ?

It was added in 1.5. See java.util.Arrays.toString()

John Davison

 

[Mike Schilling]

Hi,

Sorry for asking a lame question, but I googled to find the answer and
did not find any.

is there a nice toString method for array ?
something that will concatenate the toString output of each element of
the array ?

calling the toString on a array just output gibberish ( an pointer
maybe ), but does not have the result explained above.

My problem is that I upcast objects of several Classes to Object ( the
java root class ). then I call toString on the Objects. the result is
not nice for arrays...
can I do something generic that will handle array as well as Classes ?

Generic Collections have a "nice" toString(0 method that concatentates the
string values of the collection's members. The simplest way to get thei
behavior for arrays is

import java.util.Arrays;

Object[] arr;
Arrays.asList(arr).toString();

Note: this works for arrays of Object (or a subclass thereof). I don't know
of anything equivalent for arrays of scalar types.

 

[Guest]

Hi,

Sorry for asking a lame question, but I googled to find the answer and
did not find any.

is there a nice toString method for array ? something that will
concatenate the toString output of each element of the array ?

calling the toString on a array just output gibberish ( an pointer maybe
), but does not have the result explained above.

My problem is that I upcast objects of several Classes to Object ( the
java root class ). then I call toString on the Objects. the result is
not nice for arrays...
can I do something generic that will handle array as well as Classes ?

How can I does it ?

TIA,
--Philippe

Just add a method in a wrapper class like:

public String toString(){
String temp = "";

for(int i = 0; i < this.object.length - 1; i++){
temp += i + ", ";
}
}
temp += this.object[this.object.length - 1]; return temp;
}

Use a StringBuffer or StringBuilder while constructing the result.

La'ie Techie

 

[Tony Morris]

Arrays.toString(...)

Ignore suggestions to write it yourself - duplicating core API functionality
is almost always a bad thing, and certainly in this case.

 

[Will Hartung]

Arrays.toString(...)

Ignore suggestions to write it yourself - duplicating core API functionality
is almost always a bad thing, and certainly in this case.

Is that a JDK 5 thing? I don't see it in 1.4.

Regards,

Will Hartung
([email protected])

 

[Andrew Thompson]

...
Is that a JDK 5 thing? ..

...'Since:'
<http://java.sun.com/j2se/1.5.0/docs/api/java/util/Arrays.html#toString(boolean[])>

--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
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http://www.1point1C.org/ Science & Technology
http://www.lensescapes.com/ Images that escape the mundane

 

[Tony Morris]

Is that a JDK 5 thing? I don't see it in 1.4.

Regards,

Will Hartung
([email protected])

Yes.
Prior to that, you had to do a hack, such as
Arrays.asList(theArray).toString().