The 'Cannot find symbol' error in Java occurs due to typos and missing import statements. Follow these suggestions to fix it successfully.

System. out. println (s. length ()); } The difference is clear: No redundant casting: The variable s is ready to use as a String. Cleaner logic: Combines type-checking and assignment in one line.

Execute System.out.println($1) and you’ll see 52 as the output. You can run jshell with the -v command-line argument (jshell -v) to generate verbose feedback.

sb.delete(1, 9); System.out.println(x) } } The classes and StringBuffer () are similar, however StringBuilder () is newer and not thread-safe, meaning it can't be used by multiple threads at once.