I'm using java, please help me fill "next_is_exist" in the code below [closed]

If i try run the program without the "if(next_is_exist)" statement the program throw "String index out of range: 1". I also tried "if(next != NULL)" but is doesn't work. Please help me fill "next_is_exist" in the code below.

int arr[] = new int[5];
for (int i = 0; i < 5; i++) {
       int current = arr[i];
       int next = arr[i + 1];
       if (next_is_exist) {
           ...
       } 
}