System.currentTimeMillis versus (new Date()).getTime()

gistfile1.java

package ledlogic.com.utility;

import java.util.Date;

import org.apache.log4j.Logger;
import org.junit.Test;

public class MsTest {
	private static final Logger LOG = Logger.getLogger(MsTest.class);
	
	@Test
	public void testSystemMillisecondsVersusNewDate() {
		long[] it = { 0L, 0L};
		long outerRuns = 1000L;
		long innerRuns = 1000000L;
		for (long oc=0; oc<outerRuns; oc++) {
			long s0 = System.currentTimeMillis();
			long temp = 0;
			for (long ic=0; ic<innerRuns; ic++) {
				temp = getSystemCurrentTime();
			}
			long s1 = System.currentTimeMillis();
			for (long ic=0; ic<innerRuns; ic++) {
				temp = getNewDateCurrentTime();
			}
			long s2 = System.currentTimeMillis();
			long sys = (s1-s0);
			long dat = (s2-s1);
			LOG.debug("sys:" + sys + ", dat:" + dat);
			it[0] += sys;
			it[1] += dat;
		}
		LOG.debug("TOTAL sys:" + it[0] + ", dat:" + it[1]);
	}
	
	private Long getSystemCurrentTime() {
		return System.currentTimeMillis();
	}
	
	private Long getNewDateCurrentTime() {
		return (new Date()).getTime();
	}
}