Java获取当前时间的3种方法

 // 方法1
Date currentDate = new Date();
 // 方法2
Calendar now = Calendar.getInstance();
 // 方法3
long currentTime = System.currentTimeMillis();
        
System.out.println("当前时间：" + currentDate);
System.out.println("当前时间：" + now.getTime());
        
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
System.out.println("当前时间-格式化时间:" + sdf.format(currentDate));
System.out.println("当前时间-格式化时间:" + sdf.format(new Date(currentTime)));

System.out.println("当前时间-13位时间戳:" + currentDate.getTime());
System.out.println("当前时间-13位时间戳:" + now.getTimeInMillis());
 System.out.println("当前时间-13位时间戳:" + currentTime);

效率比较：3>1>2
效率参考：https://www.cnblogs.com/zhujiabin/p/6168671.html?utm_source=itdadao&utm_medium=referral

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