时间格式化

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public static void main(String [] args){

Date date=new Date();
System.out.println(date);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd：hh:mm:ss");

System.out.println(sdf.format(date));
System.out.println(sdf2.format(date));

}