How to get system time in Java-javaTutorial-php.cn

How to get system time in Java

醉折花枝作酒筹

Release： 2021-04-28 18:51:05

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This article will introduce to you four methods of obtaining system time in Java. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

How to get system time in Java

1. Get the current time through the Date class

Date day=new Date();    
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
System.out.println(df.format(day));

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2. Get the current time through the currentTimeMillis method in the System class

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   
System.out.println(df.format(System.currentTimeMillis()));

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3. Get the current time through the Calendar class

Calendar c = Calendar.getInstance();//可以对每个时间域单独修改   
int year = c.get(Calendar.YEAR);  
 int month = c.get(Calendar.MONTH);   
int date = c.get(Calendar.DATE);    
int hour = c.get(Calendar.HOUR_OF_DAY);   
int minute = c.get(Calendar.MINUTE);   
int second = c.get(Calendar.SECOND);    
System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second);

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4. Get the current time through the Date class

Date date = new Date();    
String year = String.format("%tY", date);   
String month = String.format("%tB", date);   
String day = String.format("%te", date);    
System.out.println("今天是："+year+"-"+month+"-"+day);

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