Comments on: Java Creational Design Patterns – Singleton Pattern https://www.opencodez.com/java/singleton-pattern.htm develope | share | reuse Tue, 10 Dec 2019 14:40:54 +0000 hourly 1 By: Peter https://www.opencodez.com/java/singleton-pattern.htm/comment-page-1#comment-92672 Fri, 02 Aug 2019 14:12:11 +0000 https://www.opencodez.com/?p=4391#comment-92672 the OCP course material implies it is better to use an inner class to do the singleton initialization.
This way, you don’t need a synchronized block, and it only gets initialized when used.
The example they use looks like this:

public class Logger {
private Logger() {
// private constructor
}

public static class LoggerHolder {
public static Logger logger = new Logger();
}

public static Logger getInstance() {
return LoggerHolder.logger;
}

public void log(String s) {
// log implementation
System.err.println(s);
}
}

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