星期，时间

星期：

Calendar calendar=Calendar.getInstance();
int i = calendar.get(Calendar.DAY_OF_WEEK)-1;
System.out.println(i);

设置时间：

int hour=12;
int time=00;
calendar.set(Calendar.HOUR_OF_DAY,hour);
calendar.set(Calendar.MINUTE,time);
Date time1 = calendar.getTime();
System.out.println(time1);

时间比较：

Date date =new Date();
int i = date.compareTo(time1);  (等于1为超时，等于-1为没超时)

计算时间差：

Calendar calendar=Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY,12);
calendar.set(Calendar.MINUTE,00);
long time = calendar.getTime().getTime();
Date date =new Date();
System.out.println((date.getTime()-time)/(1000*60)); //输出分钟