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primitiveType[1] Confusing Java POS

2 replies on 1 page. Most recent reply: Jun 9, 2005 11:04 PM by Matthias Neumair

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Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

primitiveType[1] Confusing Java POS

Posted: Jun 9, 2005 6:30 AM

Hi Folks:

Going through the Java Pos documentation, I'm trying
to understand why someone would create and return
or utilize a primitive value carried as a single
array element. I thought Java has no dereferencing
as in other languages (hence memory address is would
not be a reason).

For instance why would someone declare variables as
follows:

boolean var1[1];
int var2[1];

Why not just say:

boolean var1;
int var2?

Thanks in advance.

Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

Re: primitiveType[1] Confusing Java POS

Posted: Jun 9, 2005 6:38 AM

Its Ok, I got the answer:

Wrapper types for primitives e.g Integer and Boolean
do not support modification and ints and boolean
are passed by value.

int var[0] = x;
var[0] = y;

has a different effect

Integer var = new Integer(x);
var = new Integer(y);

Only that I don't see why this would make a difference
in Java Pos.

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: primitiveType[1] Confusing Java POS

Posted: Jun 9, 2005 11:04 PM

The difference lies in:

var2 = var1

If var1 is int[0], by altering var1[0] also var2[0] is altered.

if var1 is Integer, you can only alter it this way:
var1 = new Integer(newVal).
In this case the value of var2 would not be altered.

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