Java 格式化时间显示日期和时间

import java.util.Calendar;
import java.util.Formatter;

public class MainClass {
   public static void main(String args[]) {
      Formatter fmt = new Formatter();
      Calendar cal = Calendar.getInstance();
      fmt = new Formatter();
      fmt.format("%tc", cal);
      System.out.println(fmt);
   }
}