how to read a int[] chunk by chunk

Question

Suppose an int[] is passed in, and I have function f(int[] array), if I don't know the length of array, how can I execute it chunk by chunk? or is there any better way do it? Thanks

You do know the length of the array, it is `array.length` - Maybe you mean "How many elements were initialized with a different value then 0?" — amit, Apr 01 '12 at 11:50
Is there any change the size of array is larger than Integer.Max_VALUE? — Jeffrey.W.Dong, Apr 01 '12 at 11:58
The size of the array cannot be bigger then `Integer.MAX_VALUE` — amit, Apr 01 '12 at 12:00

score 3 · Accepted Answer · answered Apr 01 '12 at 11:48

3

In Java, you can get the length of the array from the array, simply by using:

int theArrayLength = array.length;

answered Apr 01 '12 at 11:48

MByD

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Is there any change the size of array is larger than Integer.Max_VALUE? – Jeffrey.W.Dong Apr 01 '12 at 11:55
@Jeffrey No. Since you index arrays by using ints that'd be somewhat useless ;) – Voo Apr 01 '12 at 12:02

score 2 · Answer 2 · answered Apr 01 '12 at 11:50

2

What do you mean by "execute it" and "chunk by chunk"? You can always iterate over the array using an index.

for(int i = 0; i < array.length; i++) {
  bar(array[i]);
}

answered Apr 01 '12 at 11:50

andrunix

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score 2 · Answer 3 · answered Apr 01 '12 at 11:53

Check if the array is null, and if so, throw an exception (e.g. IllegalArgumentException)
Use enhanced for-loop

Example -

void f(int[] array){
    if(array == null){
        throw new IllegalArgumentException();
    }

    for(int arrayItem : array){
        // iterate through array chunk-by-chunk
    }
}

Using this approach, you can iterate through the array chunk-by-chunk without explicitly knowing the length of the array.

score 1 · Answer 4 · answered Apr 01 '12 at 11:48

1

doesn't java also know the arraya.length ?

answered Apr 01 '12 at 11:48

Rps

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score 0 · Answer 5 · answered Apr 01 '12 at 11:49

0

You can find the length of any array in Java by doing

array.length

answered Apr 01 '12 at 11:49

Waynn Lue

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how to read a int[] chunk by chunk

5 Answers5

Example -