What are the three ways to get the current time in java

1. Obtain

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

through Date in the Util package (video tutorial recommendation: java video tutorial)

2 , Get the time through the Calendar of the Util package

Calendar calendar= Calendar.getInstance();
SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd :hh:mm:ss");
System.out.println(dateFormat.format(calendar.getTime()));

3. Get the time through the Calendar of the Util package, and get the year, month, day, hour, minute and second respectively

Calendar cal=Calendar.getInstance();      
int y=cal.get(Calendar.YEAR);      
int m=cal.get(Calendar.MONTH);      
int d=cal.get(Calendar.DATE);      
int h=cal.get(Calendar.HOUR_OF_DAY);      
int mi=cal.get(Calendar.MINUTE);      
int s=cal.get(Calendar.SECOND);      
System.out.println("现在时刻是"+y+"年"+m+"月"+d+"日"+h+"时"+mi+"分"+s+"秒");

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