ADDITIONAL SYSTEM INFORMATION :
Java SE version 8 run on Windows-7

A DESCRIPTION OF THE PROBLEM :
The second parameter (to exclusive index ) should be bigger or at most equals to the first parameter (from the index).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
try: arr is an ArrayList object
1. arr.removeRange(3, 4);//exclusive, only last elm: deleted (Ok)
2. arr.removeRange(3, 3);//nothing happenned: Ok
3. arr.removeRange(3, 2);//why 1 copy (3), instead of error message
4. arr.removeRange(3, 1);//why 2 copies (2 & 3), no error message
5. arr.removeRange(3, 0);//why 3 copies (1, 2 & 3), no error message


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
1. Ok
2. Ok
3. running error message
4. idem
5. idem
ACTUAL -
3. 1 copy instead of error message
4. 2 copies instead of error message
5. 3 copies instead of error message

---------- BEGIN SOURCE ----------
import java.util.*;

public class ALRemRange extends ArrayList<Integer> {
public static void main(String[] args){
// create an empty array list
ALRemRange arr = new ALRemRange();
// use add() method to add values in the list
arr.add(1);//idx:0
arr.add(2);//idx:1
arr.add(3);//idx:2
arr.add(4);//idx:3
System.out.println("The list before using removeRange:" + arr);
try{//removeRange(from, to exclusive)
// arr.removeRange(3, 4);//exclusive, only last elm: deleted (Ok)
// arr.removeRange(3, 3);//nothing happenned: Ok
// arr.removeRange(3, 2);//why 1 copy (3), instead of error message
// arr.removeRange(3, 1);//why 2 copies (2 & 3), no error message
arr.removeRange(3, 0);//why 3 copies (1, 2 & 3), no error message
}catch(Exception e){System.out.println(e);}
System.out.println("The list after using removeRange:" + arr);
}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
adding if (to>from) clause to prompt the error messages

FREQUENCY : always