Discussion
The program is run with java -ea Sketch11 - what will be the output?
public class Sketch11
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("ab");
assert sb.length() == 3 : sb;
System.out.println(sb);
}
}
Answer: C
The assertion fails because the length is 2, not 3. Expression2 is sb, so the AssertionError constructor receives the StringBuilder and calls its toString, giving the message ab. Note the message is the object's text, not the length that was tested.
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