请问此程序错在哪里?怎么改?
import java.io.*;
import java.util.*;
class Logger{
public void Log() throws Exception{
PrintStream logps;
GregorianCalendar now;
logps=new PrintStream(new FileOutputStream("log"));
now=new GregorianCalendar();
logps.println(now.getTime());
}
public void logWithTZ() throws Exception
{PrintStream logps;
GregorianCalendar now;
logps=new PrintStream(new FileOutputStream("log"));
now=new GregorianCalendar();
logps.print(now.getTimeZone().getDisplayName()+" ");
logps.println(now.getTime());
}
}