Thread: HELP ME HOW TO DECREMENT THIS PLS

int [ ] arr = new int[ 4 ]
for(int i = 0; i < arr.length; i++)
arr[ i ] = i + 1
System.out.println(arr[ i ]++)

i did it on purpose..when i use -- it says outofbounds

it says outofbounds

That JVM is fussy about you're using indexes that go past the end of an array.
Check your code to be sure you do not allow that to happen.

int [ ] arr = new int[ 10 ];

for(int i =8; i < arr.length; i--){
arr[ i ] = i - 1;
System.out.println(arr[ i ]);


this is my code for decrement..but it says "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1"

i want to exit that at 0 hehe

not yet...zzzzzzz

You must read the syntax of the for loop. Kevin has provided you with the best answer. He told you your condition.
So for loop's syntax is actually
Syntax:

for(initialization;condition;iteration){
//body of loop;
}

And you have successfully done your initialization and iteration (decrement). You have problem in your condition.
You said you want for loop to run till 0.
You are starting from 8. Your array size is 10. You are actually starting from 8 and you are limiting your loop to go till size of array (10).
First time your loop starts, value is 8 that is less than 10, true. Works fine. You decrement one and value becomes 7.... and 6,5,4,3,2,1,0,-1 and so on....
You will never have array index as -1. And this is the problem. Index out of bounds.
Now think and try to solve.
Luck