Question

I have an array

int[] arr = {9,20,-2,-45,23,5,1};

I’m sorting it using

java.util.Arrays.sort(arr);

The for loop:

for(int i =0;(i<arr.length) && (arr[i] > 0) ; i++)

doesn’t seem to work because of the condition (arr[i] > 0). I coudn’t think of a reason why this shouldn’t work. What’s surprising is that the follwing loop works in expected manner :

for(int i =0;(i<arr.length) && (arr[i] != 0) ; i++)

and

for(int i =0;(i<arr.length) && (arr[i] < 0) ; i++)

Answer 1

java.util.Arrays.sort(int[] arg); sorts in ascending order, as a result the first value (arr[0]) after sorting would be -45. for(int i =0;(i<arr.length) && (arr[i] > 0) ; i++) would be false on the first iteration since arr[0] == -45, and therefor (arr[0] > 0) is false.)