Discussion
The program is run with java -ea Probe98 - what will be the output?
public class Probe98
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("level");
assert sb.reverse().toString().equals("level");
System.out.println(sb);
}
}
Answer: B
level is a palindrome, so reversing it gives the same text and the assertion passes. The catch is that reverse mutates the builder in place rather than returning a copy, so this assertion has a side effect: with assertions disabled sb would never be reversed. Here the printed value is level either way.
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