Why is This Condition not working? Inserting Sort

Question

Hey,
I made an 'Insert-Sort' in Java and for some reason it works when the condition is in one position, and it doesnt work when i switch places between the expression before the '&&' and after. HOW?

The Specific Sorting Function (code):
static int[] insertSort(int[] arr){

for (int i = 1; i < arr.length; i++){
int current = arr[i];
int j = i - 1;

while(j >= 0 && current < arr[j]){
arr[j + 1] = arr[j];
j--;
}
arr[j + 1] = current;
}
return arr;

}

Answer 1

&& operator always check first condition if it is false it doesn't check second one.

C1 && C2
if C1 is false C2 won't be checked.
for example when j<0 second part won't be checked so it won't cause index error in arr[j].

But when you flip them if j<0 arr[j] will cause index error