1.Java中一般获取时间使用
Date d =new Date();
返回一个Date时间类型 Wed May 13 11:19:27 CST 2020
2.将转化日期时间格式
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd ");
SimpleDateFormat sdf3 = new SimpleDateFormat(“HH:mm:ss”);
System.out.println(sdf.format(new Date()));
System.out.println(sdf2.format(new Date()));
System.out.println(sdf3.format(new Date()));
SimpleDateFormat 类格式化日期的输出格式。
3.系统毫秒数转化为Date 日期格式
long timeLong = System.currentTimeMillis();//获取系统时间
Date date = new Date();
date.setTime(timeLong);
4.根据当前系统时间获取年月日时分秒
long timeLong = System.currentTimeMillis();//获取系统时间
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(timeLong);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour24 = calendar.get(Calendar.HOUR_OF_DAY);//24小时制
int hour12 = calendar.get(Calendar.HOUR);//12小时制
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
5.根据日期Date类获取年月日时分秒
Date date = new Date();
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR); //获取年份
int month = calendar.get(Calendar.MONTH) + 1; //获取月份 月份从0开始
int date = calendar.get(Calendar.DATE); //获取日
// calendar.get(Calendar.HOUR); //时（12小时制）
int hour = calendar.get(Calendar.HOUR_OF_DAY); //时（24小时制）
int minute = calendar.get(Calendar.MINUTE); //分
int second = calendar.get(Calendar.SECOND); //秒 calendar.setTime(date );
6.实时刷新系统时间加粗样式
1).线程+死循环
Thread thread1 = new Thread() {
@Override
public void run() {
while (true) {
Date date = new Date();
//data每个一秒钟刷新一次。刷新覆盖
//自己的逻辑处理
}
try {
sleep(1000);
} catch (Exception e) {
}
}
}
};
thread1.start();