JAVA SYS TIME

public class TestSys {

//@Test

public void testSysDefault() {

Properties sysProperties = System.getProperties();

Set<Map.Entry<Object, Object>> sysSet = sysProperties.entrySet();

Iterator<Entry<Object, Object>> sysIter = sysSet.iterator();

while (sysIter.hasNext()) {

Entry<Object, Object> sysEntry = sysIter.next();

System.out.println(sysEntry.getKey());

System.out.println(sysEntry.getValue());

}

}

 

@Test

public void testTime() {

System.out.println(TimeZone.getDefault().getID());

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

System.out.println(df.format(new Date()));

 

Calendar c = Calendar.getInstance();

int year = c.get(Calendar.YEAR);

int month = c.get(Calendar.MONTH) + 1;

int date = c.get(Calendar.DATE);

int hour = c.get(Calendar.HOUR_OF_DAY);

int minute = c.get(Calendar.MINUTE);

int second = c.get(Calendar.SECOND);

System.out.format("%4d-%2d-%2d %2d:%2d:%2d\n", year, month, date, hour, minute, second);

 

System.setProperty("user.timezone", "Asia/Shanghai");

System.out.println(TimeZone.getDefault().getID());

System.out.println(df.format(new Date()));

System.out.println(df.format(Calendar.getInstance().getTime()));

}

}