[1886] in java-interest
Q: array initialization.
daemon@ATHENA.MIT.EDU (Christophe Meessen)
Tue Sep 19 15:39:28 1995
Date: Tue, 19 Sep 1995 18:32:56 +0200
To: java-interest@java.Eng.Sun.COM
From: meessen@cppm.in2p3.fr (Christophe Meessen)
hello,
another question.
I wrote the following command
SortElem v[] = new SortElem[10];
What is this command supposed to do ?
Are SortElem instances created ?
If yes
what constructor is called ?
how many instances are created ?
According to the reference manual (page 6) this is the way an array of
instances is created.
Here is a small program that didn't do what I expected
Suppose a class SortElem;
public class SortElem[
public int val;
...
}
later...
static SortElem v[] = new SortElem[3];
v[0].val = 2;
v[1].val = 5;
v[2].val = 8;
for( int i = 0; i < v.length; i++ )
System.out.println( v[i].val );
very simple.
And the result is....
8
8
8
Not exactly what I would have expected.
It is as if only one instance is created and all array elements hold a
reference to that object !
This is not the same as in C++ where as many instance are created as there
are elements in the array and for each one of them the default constructor
(with no argument) is called.
Bien cordialement,
Ch.Meessen
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