Java OCA OCP Practice Question 2423

Question

What is the output of the following code? 

public class Main { 
    public static void main(String args[]) { 
        StringBuilder sb1 = new StringBuilder ("123456"); 
        sb1.subSequence(2, 4); 
        sb1.deleteCharAt(3); 
        sb1.reverse(); 
        System.out.println(sb1); 
    } 
}
  • a 521
  • b Runtime exception
  • c 65321
  • d 65431


c

Note

Like the method substring, the method subSequence doesn't modify the contents of a StringBuilder.

Hence, the value of the variable sb1 remains 123456, even after the execution of the following line of code:. 

sb1.subSequence(2, 4);

The method deleteCharAt() deletes a char value at position 3.

Because the positions are zero-based, the digit 4 is deleted from the value 123456, resulting in 12356.

The method reverse modifies the value of a StringBuilder by assigning to it the reverse representation of its value.

The reverse of 12356 is 65321.




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