The Java Language Specification, Third Edition

15.10.3 Example: Array Creation and Out-of-Memory Detection EXPRESSIONS
434
prints:
[4,3]
because the first dimension is calculated as 4 before the second dimension expression
sets i to 3.
If evaluation of a dimension expression completes abruptly, no part of any
dimension expression to its right will appear to have been evaluated. Thus, the
example:
class Test {
public static void main(String[] args) {
int[][] a = { { 00, 01 }, { 10, 11 } };
int i = 99;
try {
a[val()][i = 1]++;
} catch (Exception e) {
System.out.println(e + ", i=" + i);
}
}
static int val() throws Exception {
throw new Exception("unimplemented");
}
}
prints:
java.lang.Exception: unimplemented, i=99
because the embedded assignment that sets i to 1 is never executed.
15.10.3 Example: Array Creation and Out-of-Memory Detection
If evaluation of an array creation expression finds there is insufficient memory to
perform the creation operation, then an OutOfMemoryError is thrown. This check
occurs only after evaluation of all dimension expressions has completed normally.
So, for example, the test program:
class Test {
public static void main(String[] args) {
int len = 0, oldlen = 0;
Object[] a = new Object[0];
try {
for (;;) {
++len;
Object[] temp = new Object[oldlen = len];
temp[0] = a;
a = temp;
}
} catch (Error e) {
DRAFT