how to fix this problem?
public class Binary { static public Student Search(Student[] arr, String key, int left, int right){
int mid = left + (right - left)/2;
if(arr[mid].Surname == key){
if(arr[mid].Academic_debt == "4") {
Student temp = arr[mid];
arr[mid] = null;
return temp;
}
return null;
}
else if(arr[mid].Surname > key){
return Search(arr,key ,left, (mid - 1));
}
else{
return Search(arr,key ,(mid + 1), right);
}
}
static public void Show(Student[] arr){
int k = 0;
for(int i = 0; i < arr.length; i++)
{
if(arr[i] != null)
{
System.out.println( ++k + ": " + arr[i].toString());
}
}
}
}
