Java OCA OCP Practice Question 745

Question

What is the output of the following class? 

1:  package mypkg; 
2:  public class Main { 
3:     public static void main(String[] args) { 
4:        StringBuilder builder = new StringBuilder("54321"); 
5:        builder.substring(2); 
6:        System.out.println(builder.charAt(1)); 
7:     } 
8:  }
  • A. 1
  • B. 2
  • C. 3
  • D. 4


D.

Note

Line 4 creates a StringBuilder of length 5.

Pay attention to the substring() method StringBuilder.

It returns a String with the value 321.

It does not change the StringBuilder itself.

Then line 6 is retrieving the second indexed element from that unchanged value, which is 4.

Option D is correct.




PreviousNext

Related