The Java Language Specification, Third Edition

EXPRESSIONS Example: Array Creation Evaluation Order 15.10.2
and:
Age[][][][][] Aquarius = new Age[6][10][8][12][];
is equivalent to:
Age[][][][][] Aquarius = new Age[6][][][][];
for (int d1 = 0; d1 < Aquarius.length; d1++) {
Aquarius[d1] = new Age[10][][][];
for (int d2 = 0; d2 < Aquarius[d1].length; d2++) {
Aquarius[d1][d2] = new Age[8][][];
for (int d3 = 0; d3 < Aquarius[d1][d2].length; d3++) {
Aquarius[d1][d2][d3] = new Age[12][];
}
}
}
with d, d1, d2 and d3 replaced by names that are not already locally declared.
Thus, a single new expression actually creates one array of length 6, 6 arrays of
length 10, 6× 10 = 60 arrays of length 8, and 6 × 10 × 8 =
480 arrays of length
12. This example leaves the fifth dimension, which would be arrays containing the
actual array elements (references to Age objects), initialized only to null references.
These arrays can be filled in later by other code, such as:
Age[] Hair = { new Age("quartz"), new Age("topaz") };
Aquarius[1][9][6][9] = Hair;
A multidimensional array need not have arrays of the same length at each
level.
Thus, a triangular matrix may be created by:
float triang[][] = new float[100][];
for (int i = 0; i < triang.length; i++)
triang[i] = new float[i+1];
15.10.2 Example: Array Creation Evaluation Order
DRAFT
In an array creation expression (§15.10), there may be one or more dimension
expressions, each within brackets. Each dimension expression is fully evaluated
before any part of any dimension expression to its right.
Thus:
class Test {
public static void main(String[] args) {
int i = 4;
int ia[][] = new int[i][i=3];
System.out.println(
"[" + ia.length + "," + ia[0].length + "]");
}
}
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