Discussion
What will be the output of the program?
public class Sketch11
{
void run()
{
StringBuilder sb = new StringBuilder("abc");
sb.reverse();
System.out.println(sb);
}
public static void main(String[] args)
{
new Sketch11().run();
}
}
Answer: C
Unlike String, StringBuilder is mutable and reverse changes the object in place as well as returning it. The result is cba even though the return value was discarded. This is the difference that catches people who have just learned that String methods return new objects.
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