Java中Calendar日历类型常见方法详解

Calendar cal=Calendar.getInstance();//默认当前时间

Calendar calendar = Calendar.getInstance();
//获取年份
System.out.println("年:"+calendar.get(Calendar.YEAR));
//月份默认从0开始，需要加1
System.out.println("月:"+calendar.get(Calendar.MONTH) + 1);
//获取日期
System.out.println("日:"+calendar.get(Calendar.DAY_OF_MONTH));
//获取小时
System.out.println("时:"+calendar.get(Calendar.HOUR_OF_DAY));
//获取分钟
System.out.println("分:"+calendar.get(Calendar.MINUTE));
//获取秒
System.out.println("秒:"+calendar.get(Calendar.SECOND));
//获取当前时间是星期几,1表示星期天,2表示星期一,以此类推,7表示星期六
System.out.println("星期:"+calendar.get(Calendar.DAY_OF_WEEK));

Calendar calendar = Calendar.getInstance();
//一次性设置年月日时分秒
calendar.set(2023,2,5,15,30,50);
System.out.println(calendar.getTime());

Calendar calendar = Calendar.getInstance();
//设置年份
calendar.set(Calendar.YEAR,2023);
//设置月份,由于月份下标从0开始 所以赋值月份要-1
calendar.set(Calendar.MONTH,1);
//设置日期
calendar.set(Calendar.DAY_OF_MONTH,15);
//设置小时
calendar.set(Calendar.HOUR_OF_DAY,23);
//设置分钟
calendar.set(Calendar.MINUTE,59);
//设置秒
calendar.set(Calendar.SECOND,59);
//将星期设置为星期天
calendar.set(Calendar.DAY_OF_WEEK,1);  
System.out.println(calendar.getTime());