Which statement will empty the contents of a StringBuilder variable named sb?

Question

Options

• Asb.deleteAll();
• Bsb.delete(0, sb.size());
• Csb.delete(0, sb.length());
• Dsb.removeall();

• A
  1% (1)
• B
  3% (2)
• C
  90% (61)
• D
  6% (4)

Explanation

sb.delete(0, sb.length()) is correct because StringBuilder.delete(int start, int end) removes characters from the start index (inclusive) to the end index (exclusive), and sb.length() returns the total number of characters - so this effectively clears the entire contents.

Option A (deleteAll()) and D (removeAll()) don't exist in the StringBuilder API at all; they are fabricated method names designed to trip you up. Option B (sb.size()) is also wrong because StringBuilder has no size() method - that belongs to collection classes like ArrayList; the correct method for character count is length().

Memory tip: Think of StringBuilder as a ruler - it measures itself with length(), not size(). Whenever you need to clear a StringBuilder, remember the pattern delete(0, sb.length()) - "from zero to the length."

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