CareerCup

for this code:

class Interview {
        // input is max 3 chars
       public static int convertToString(int input) throws IllegalArgumentException;
}

write a method which checks whether the proper exception is being thrown.

WAP :
public boolean hasUniqueChars(String a);

- String can contain any type of chars
- You cannot use any type of Collections

write as many test cases for this : example : 123, 1, 2,... -123, 0,...

class Interview {
        // input is max 3 chars
       public static int convertToString(int input) throws IllegalArgumentException;
}