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14 package ch.qos.logback.classic.issue.lbclassic36;
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16 import java.text.SimpleDateFormat;
17 import java.util.Date;
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22 public class DateFormatPerf_Tapp {
23 public static final String ISO8601_PATTERN = "yyyy-MM-dd HH:mm:ss,SSS";
24 static final long NANOS_IN_ONE_SEC = 1000 * 1000 * 1000L;
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26 static long RUN_LENGTH = 1000 * 1000;
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28 public static void main(String[] args) {
29 for (int i = 0; i < 5; i++) {
30 doRawJoda();
31 doRawSDF();
32 }
33
34 print("Raw Joda: ", doRawJoda());
35 print("Raw SDF: ", doRawSDF());
36 }
37
38 static void print(String msg, double avg) {
39 System.out.println(msg + " average tick " + avg + " nanoseconds");
40 }
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42 static double doRawJoda() {
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44 @SuppressWarnings("unused")
45 long timeInMillis = new Date().getTime();
46 long start = System.nanoTime();
47 for (int i = 0; i < RUN_LENGTH; ++i) {
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49 }
50 return (System.nanoTime() - start) * 1.0d / RUN_LENGTH;
51 }
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53 static double doRawSDF() {
54 SimpleDateFormat simpleFormat = new SimpleDateFormat(ISO8601_PATTERN);
55 long timeInMillis = new Date().getTime();
56 long start = System.nanoTime();
57 for (int i = 0; i < RUN_LENGTH; ++i) {
58 simpleFormat.format(timeInMillis);
59 }
60 return (System.nanoTime() - start) * 1.0d / RUN_LENGTH;
61 }
62
63 }