Size of 2 dimensional array

[Chuck M.]

Hi. I have a simple question, how do I find the length of a two
dimensional array? I want to know how to find how many rows are in an
array and how many columns are in each row. Thanks.

 

[Daniel Pitts]

Hi. I have a simple question, how do I find the length of a two
dimensional array? I want to know how to find how many rows are in an
array and how many columns are in each row. Thanks.

Object[] foo = new Object[10];

foo.length will be 10...

Object[][] foo = new Object[10][];
foo[0] = new Object[25];
foo[1] = new Object[15];

foo.length = 10;
foo[0].length = 25;
foo[1].length = 15;


You can't know the length of every row unless you test them all. Thats
the down side to a two dimensional array in Java. You'll probably be
better off using some other mechanism for your storage. Arrays are way
too primitive anyway.

 

[Roedy Green]

Hi. I have a simple question, how do I find the length of a two
dimensional array? I want to know how to find how many rows are in an
array and how many columns are in each row. Thanks.

see http://mindprod.com/jgloss/array.html#MATRIXGOTCHAS

 

[Chuck M.]

Thank you everyone.

 

[Christian]

see http://mindprod.com/jgloss/array.html#MATRIXGOTCHAS

I specially liked that sentence in the article:
"Arrays are like virgins. They are very careful about what they allow in
themselves."