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Multi Threading

Question : 18

Total: 44

Given:

1. public class MyLogger {
2.   private StringBuilder logger = new StringBuilder();
3.   public void log(String message, String user) {
4.    logger.append(message);
5.    logger.append(user);
6.   }
7. }

The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system.
How must this code be changed to be thread-safe?

synchronize the log method
replace StringBuilder with StringBuffer
replace StringBuilder with just a String object and use the string concatenation (+=) within the log method
No change is necessary, the current MyLogger code is already thread-safe.

Validate

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