java get current time

There are two main ways, of which the use of Date is better to control, the code is as follows: 
//Use Calendar
Calendar now = Calendar.getInstance();
System.out.println("年：" + now.get(Calendar.YEAR));
System.out.println("月：" + (now.get(Calendar.MONTH) + 1));
System.out.println("日：" + now.get(Calendar.DAY_OF_MONTH));
System.out.println("时：" + now.get(Calendar.HOUR_OF_DAY));
System.out.println("分：" + now.get(Calendar.MINUTE));
System.out.println("Seconds:" + now.get(Calendar.SECOND)); 
Output: 
　　Year: 2018 - 
　　Month: 5 
　　:4 
　　:22 
　　:48 
　　Seconds:28

// use Date
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("Current time: " + sdf.format(d)); 
Output: 
　　Current time: 2018-05-04 22:48:28