Is it possible to initialize and/or declare multiple arrays in the same line in Java?
ie.
int a, b, c, d, e = 4
works but
int[] a, b, c, d, e, = new int[4]
doesn't seem to work (size of array is 4)
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4 Answers
Bear in mind that
int a, b, c, d, e = 4;
is declaring 5 ints but only initialising 'e'.
In the same way,
int[] a, b, c, d, e = new int[4];
will only initialise e.
You'd need something like
int[] a=new int[4], b=new int[4], etc...
which frankly, isn't worth one-lining...
Comments
try
int[] a = new int[4], b = new int[4], c = new int[4], d = new int[4], e = new int[4];
You have to instantiate an array for each variable if you want to create five different arrays.
If you want to create one array and reference it from five variables Goran has the solution.
Comments
You are missing the new keyword
Try this:
int[] a, b, c, d, e = new int[4];
3 Comments
Daniel Sopel
Thanks, I forgot to put that in my question (edited), but it still won't compile in BlueJ (variable a may not have been initialized).
Goran Jovic
Interesting. It seems that the array object had been assigned only to reference named
e.Goran Jovic
It should be
int[] a, b, c, d, e ; a = (b = (c = (d = (e = new int[4])))); The assignment operators' return value is the assigned value. However, as Jon already said, they would all still refer to the same array.. And it's two lines now.. and ugly..What you tried is possible only for value types. In Java arrays are reference types i.e. objects.
What you tried is not possible (as Gwyn explained).
On the other hand you could:
int[][] arrays = new int[4][5];
And then use: arrays[0], arrays[1].. instead od a,b.
