Date Format: recommended SimpleDateFormat

A theme

　　Date formatted string: SimpleDateFormat> DateFormatUtils

Two, code

public void DateFormat(){
	SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd-HH-mm");
	long startTime1 = System.currentTimeMillis();
	for(int i = 0; i< 100000; i++){
		DateFormatUtils.format(new Date().getTime(), "yyyyMMdd-HH-mm");
	}
	System.out.println("DateFormatUtils " + (System.currentTimeMillis() - startTime1));
	long startTime2 = System.currentTimeMillis();
	for(int i = 0; i< 100000; i++){
		sdf.format(new Date());
	}
	System.out.println("SimpleDateFormat " + (System.currentTimeMillis() - startTime2));
}

 

Third, the test results:

DateFormatUtils 238
SimpleDateFormat 120

CONCLUSIONS:

　　1.SimpleDateFormat little difference between efficiency and DateFormatUtils

　　There is thread-safety issues 2.SimpleDateFormat, use be used with caution (shared Calendar references)