public static void main(String[] args) {
int startTime, endTime;
final int TIMES = 200_000;
final int FACTOR = 1_000_000;
int x;
StringBuilder string1 = new StringBuilder("");
StringBuilder string2 = new StringBuilder(TIMES * 4);
LocalDateTime now;
now = LocalDateTime.now();
startTime = now.getNano();
for (x = 0; x < TIMES; ++x) string1.append("Java");
now = LocalDateTime.now();
endTime = now.getNano();
System.out.println(
"Time with empty StringBuilder: " + ((endTime - startTime) / FACTOR + " milliseconds"));
now = LocalDateTime.now();
startTime = now.getNano();
for (x = 0; x < TIMES; ++x) string2.append("Java");
now = LocalDateTime.now();
endTime = now.getNano();
System.out.println(
"Time with empty StringBuilder: " + ((endTime - startTime) / FACTOR + " milliseconds"));
}
@Test
public void shouldPlayWithClocks() {
Clock c1 = Clock.systemDefaultZone();
print(c1.getZone() + "|" + c1.instant());
StringBuilder builder = new StringBuilder();
for (String zoneId : ZoneId.getAvailableZoneIds()) builder.append(zoneId).append(",");
print(builder);
ZoneId z1 = ZoneId.of("Australia/Tasmania");
Clock c2 = c1.withZone(z1);
print(c2.instant().atZone(z1));
LocalDate d1 = LocalDate.now(c1);
LocalDate d2 = LocalDate.now(c2);
print(d1 + "|" + d2);
}