CODEWITHSUNDEEP
javawhile-loopindexoutofboundsexception
André Foote
André Foote

Reputation: 368

IndexOutOfBoundsException Instead of Ending Loop

Why does

int row = 1;
// multiArray[col].length = 6

while(multiArray[col][row] > 1 && row < multiArray[col].length) {
    sum += multiArray[col][row];
    row++;
}

Return an IndexOutOfBoundsException?

I thought that if row became 6, the while loop just wouldn't run, instead of returning an error.

Upvotes: 0

Views: 24

Answers (1)

rgettman
rgettman

Reputation: 178263

The && operator is a short-circuit operator. That means that if it can tell the results from the left operand, then it won't evaluate the right side.

Switch the order of operands, so the in-bounds check comes first, and if it fails, the array value check won't occur, which would throw the exception if evaluated.

while(row < multiArray[col].length && multiArray[col][row] > 1) {

Upvotes: 2

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