package com.util;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
public class Test {
public void getTimeByDate(){
Date date = new Date();
DateFormat df1 = DateFormat.getDateInstance();//日期格式,精确到日
System.out.println(df1.format(date));
DateFormat df2 = DateFormat.getDateTimeInstance();//可以精确到時分秒
System.out.println(df2.format(date));
DateFormat df3 = DateFormat.getTimeInstance();//隻顯示出時分秒
System.out.println(df3.format(date));
DateFormat df4 = DateFormat.getDateTimeInstance(DateFormat.FULL,DateFormat.FULL); //顯示日期,周,上下午,時間(精确到秒)
System.out.println(df4.format(date));
DateFormat df5 = DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG); //顯示日期,上下午,時間(精确到秒)
System.out.println(df5.format(date));
DateFormat df6 = DateFormat.getDateTimeInstance(DateFormat.SHORT,DateFormat.SHORT); //顯示日期,上下午,時間(精确到分)
System.out.println(df6.format(date));
DateFormat df7 = DateFormat.getDateTimeInstance(DateFormat.MEDIUM,DateFormat.MEDIUM); //顯示日期,時間(精确到分)
System.out.println(df7.format(date));
}
public void getTimeByCalendar(){
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);//擷取年份
int month=cal.get(Calendar.MONTH);//擷取月份
int day=cal.get(Calendar.DATE);//擷取日
int hour=cal.get(Calendar.HOUR);//小時
int minute=cal.get(Calendar.MINUTE);//分
int second=cal.get(Calendar.SECOND);//秒
int WeekOfYear = cal.get(Calendar.DAY_OF_WEEK);//一周的第幾天
System.out.println("現在的時間是:公元"+year+"年"+month+"月"+day+"日 "+hour+"時"+minute+"分"+second+"秒 星期"+WeekOfYear);
}
public static void main(String[] args) {
Test t=new Test();
t.getTimeByDate();
System.out.println("****************************");
t.getTimeByCalendar();
}
}
擷取日,如果大于16則+2個月,否則+1個月,輸出7個月
public static void main(String[] as) throws Exception {
int j;
Calendar cc = Calendar.getInstance();
int myYear = cc.get(Calendar.YEAR);
int myMonth = cc.get(Calendar.MONTH);
j=cc.get(Calendar.DATE)>16?3:2;
cc.set(Calendar.MONTH, myMonth+j);
System.out.println(myYear+"-"+cc.get(cc.MONTH));
for(int i=0;i<7;i++){
cc.add(cc.MONTH, 1);
int mm = cc.get(cc.MONTH);
int mmm=mm==0?12:mm;
System.out.println(myYear+"-"+mmm);
}
}