Just a simple for loop question

[Lek Kin Wong]

why the second one work rather than the first one?
tomcat give me java.lang.ArrayIndexOutOfBoundsException: 2

for(int i=filearray.length; i>-1; i--){

for(int i=0; i<filearray.length; i++){

[Han Jie]

Hi Lek

Why would like you using filearray.length instead of filearray.length-1 with the second one?

[Abimaran Kugathasan]

Arrays are zero based. And array length isn't equal to the last index of the array!

[Bear Bibeault]

Please take the time to choose an appropriate forum for your posts. This forum is for questions on Servlets. For more information, please click this link ⇒ CarefullyChooseOneForum.

This post has been moved to a more appropriate forum.

[Lek Kin Wong]

Abimaran Kugathasan wrote:Arrays are zero based. And array length isn't equal to the last index of the array!

many thanksss!
so how do I sort array values in descending order?

[Wouter Oet]

You can use the Arrays class optionally with a Comparator. There is even a Oracle tutorial about it (here).

[Lek Kin Wong]

Wouter Oet wrote:You can use the Arrays class optionally with a Comparator. There is even a Oracle tutorial about it (here).

I just solve the problem with Arrays class, Thank.

[Campbell Ritchie]

Lek Kin Wong wrote: . . . I just solve the problem with Arrays class, Thank. . . .

Well done. Please give us a bit more detail about what you did, in case anybody else has the same problem later.