Java OCA OCP Practice Question 890

Question

Which are the results of the following code? (Choose all that apply) 

public class Main {
   public static void main(String[] args) {
      String numbers = "012345678"; 
      System.out.println(numbers.substring(1, 3)); 
      System.out.println(numbers.substring(7, 7)); 
      System.out.println(numbers.substring(7)); 
   }
}
  • A. 12
  • B. 123
  • C. 7
  • D. 78
  • E. A blank line.
  • F. An exception is thrown.
  • G. The code does not compile. 


A, D, E.

Note

substring() has two forms.

The first takes the index to start with and the index to stop immediately before.

The second takes just the index to start with and goes to the end of the String.

Remember that indexes are zero based.

The first call starts at index 1 and ends with index 2 since it needs to stop before index 3.

The second call starts at index 7 and ends in the same place, resulting in an empty String.

This prints out a blank line.

The final call starts at index 7 and goes to the end of the String.




PreviousNext

Related