20145225《Java程序设计》 第7周学习总结

20145225《Java程序设计》

第7周学习总结

教材学习内容总结

第十三章 时间与日期

import java.util.Date;
import static java.lang.System.currentTimeMillis;
import static java.lang.System.out;

public class DateDemo {
public static void main(String[] args) {
Date date1 = new Date(currentTimeMillis());
Date date2 = new Date();
out.println(date1.getTime());
out.println(date2.getTime());
}
}

import java.util.Date;
import static java.lang.System.out;
import static java.text.DateFormat.*;
public class DateFormatDemo {
public static void main(String[] args) {
Date date = new Date();
dateInstanceDemo(date);
timeInstanceDemo(date);
dateTimeInstanceDemo(date);
}
static void dateInstanceDemo(Date date) {
out.println("getDateInstance() demo");
out.printf("\tLONG: %s%n", getDateInstance(LONG).format(date));

out.printf("\tSHORT: %s%n", getDateInstance(SHORT).format(date));
}

static void timeInstanceDemo(Date date) {
out.println("getTimeInstance() demo");
out.printf("\tLONG: %s%n", getTimeInstance(LONG).format(date));
out.printf("\tMEDIUM: %s%n", getTimeInstance(MEDIUM).format(date));
out.printf("\tSHORT: %s%n", getTimeInstance(SHORT).format(date));
}

static void dateTimeInstanceDemo(Date date) {
out.println("getDateInstance() demo");
out.printf("\tLONG: %s%n", getDateTimeInstance(LONG, LONG).format(date));
out.printf("\tMEDIUM: %s%n", getDateTimeInstance(MEDIUM, MEDIUM).format(date));
out.printf("\tSHORT: %s%n", getDateTimeInstance(SHORT, SHORT).format(date));
}
}

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class HowOld {
public static void main(String[] args) throws Exception {
System.out.print("输入出生年月日(yyyy-mm-dd):");
DateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd");
Date begin = new Date();
Date birthday = dateFormat.parse(new Scanner(System.in).nextLine());
Date currentDate = new Date();
long life = currentDate.getTime() - birthday.getTime();
System.out.println("你今年的岁数为：" + (life / (365 * 24 * 60 * 60 * 1000L)));
Date end = new Date();
long duration = end.getTime() - begin.getTime();
System.out.println("运行时间：" + (duration));
}
}

import static java.lang.System.out;
import java.time.*;
public class ZonedDateTimeDemo {
public static void main(String[] args) {
LocalTime localTime = LocalTime.of(0, 0, 0);
LocalDate localDate = LocalDate.of(1975, 4, 1);
ZonedDateTime zonedDateTime = ZonedDateTime.of(
localDate, localTime, ZoneId.of("Asia/Taipei"));

out.println(zonedDateTime);
out.println(zonedDateTime.toEpochSecond());
out.println(zonedDateTime.toInstant().toEpochMilli());
}
}

代码调试中的问题和解决过程

其他（感悟、思考等，）

学习进度条

参考资料