ThreadLocal variables usage in Java

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Can someone explain how and when “ThreadLocal” variables are used?

Jun 29, 2018 in Java by misc.edu04
• 1,380 points
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1 answer to this question.

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public class Test
{
    // SimpleDateFormat is not thread-safe, so give one to each thread
    private static final ThreadLocal<SimpleDateFormat> formatter = new ThreadLocal<SimpleDateFormat>(){
        @Override
        protected SimpleDateFormat initialValue()
        {
            return new SimpleDateFormat("yyyyMMdd HHmm");
        }
    };

    public String formatIt(Date date)
    {
        return formatter.get().format(date);
    }
}
answered Jun 29, 2018 by code.reaper12
• 3,450 points

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