写一个自己的Date,扩展Date,如: public class MyDate extends Date { public MyDate(Date d){ //自动把年月日换成某个固定的。 }}至于加减计算,myDate.getTime()后,自己算吧。
没有这类,下面是我原来写的,可以参考一下:public class Test { public static void main(String[] args) { Time t1 = new Time(21, 0); Time t2 = new Time(20, 5); Time diff = t1.subtractTime(t2);
System.out.println(diff); System.out.println("Minute = " + diff.get(Time.MINUTE)); System.out.println("Second = " + diff.get(Time.SECOND)); } } import java.text.DecimalFormat; import java.util.Arrays;/** * 时间计算工具类 * * @author bao110908 */ public class Time { /** * 时间字段常量,表示“秒” */ public final static int SECOND = 0;
/** * 时间字段常量,表示“分” */ public final static int MINUTE = 1;
/** * 时间字段常量,表示“时” */ public final static int HOUR = 2;
/** * 时间字段常量,表示“天” */ public final static int DAY = 3; /** * 各常量允许的最大值 */ private final int[] maxFields = { 59, 59, 23, Integer.MAX_VALUE - 1 };
/** * 时间数据容器 */ private int[] fields = new int[4];
/** * 无参构造,将各字段置为 0 */ public Time() { this(0, 0, 0, 0); } /** * 使用时、分构造一个时间 * @param hour 小时 * @param minute 分钟 */ public Time(int hour, int minute) { this(0, hour, minute, 0); } /** * 使用时、分、秒构造一个时间 * @param hour 小时 * @param minute 分钟 * @param second 秒 */ public Time(int hour, int minute, int second) { this(0, hour, minute, second); }
/** * 使用一个字符串构造时间<br/> * Time time = new Time("14:22:23"); * @param time 字符串格式的时间,默认采用“:”作为分隔符 */ public Time(String time) { this(time, null); } /** * 使用天、时、分、秒构造时间,进行全字符的构造 * @param day 天 * @param hour 时 * @param minute 分 * @param second 秒 */ public Time(int day, int hour, int minute, int second) { set(DAY, day); set(HOUR, hour); set(MINUTE, minute); set(SECOND, second); }
/** * 使用一个字符串构造时间,指定分隔符<br/> * Time time = new Time("14-22-23", "-"); * @param time 字符串格式的时间 */ public Time(String time, String timeSeparator) { if(timeSeparator != null) { setTimeSeparator(timeSeparator); } String pattern = patternQuote(this.timeSeparator); String matcher = new StringBuffer() .append("\\d+?").append(pattern) .append("\\d+?").append(pattern) .append("\\d+?") .toString(); if(!time.matches(matcher)) { throw new IllegalArgumentException(time + ", time format error, HH" + this.timeSeparator + "mm" + this.timeSeparator + "ss"); } String[] times = time.split(pattern); set(DAY, 0); set(HOUR, Integer.parseInt(times[0])); set(MINUTE, Integer.parseInt(times[1])); set(SECOND, Integer.parseInt(times[2])); }
/** * 设置时间字段的值 * @param field 时间字段常量 * @param value 时间字段的值 */ public void set(int field, int value) { if(value < minFields[field]) { throw new IllegalArgumentException(value + ", time value must be positive."); } fields[field] = value % (maxFields[field] + 1); // 进行进位计算 int carry = value / (maxFields[field] + 1); if(carry > 0) { int upFieldValue = get(field + 1); set(field + 1, upFieldValue + carry); } } /** * 获得时间字段的值 * @param field 时间字段常量 * @return 该时间字段的值 */ public int get(int field) { if(field < 0 || field > fields.length - 1) { throw new IllegalArgumentException(field + ", field value is error."); } return fields[field]; } /** * 将时间进行“加”运算,即加上一个时间 * @param time 需要加的时间 * @return 运算后的时间 */ public Time addTime(Time time) { Time result = new Time(); int up = 0; // 进位标志 for (int i = 0; i < fields.length; i++) { int sum = fields[i] + time.fields[i] + up; up = sum / (maxFields[i] + 1); result.fields[i] = sum % (maxFields[i] + 1); } return result; } /** * 将时间进行“减”运算,即减去一个时间 * @param time 需要减的时间 * @return 运算后的时间 */ public Time subtractTime(Time time) { Time result = new Time(); int down = 0; // 退位标志 for (int i = 0, k = fields.length - 1; i < k; i++) { int difference = fields[i] + down; if (difference >= time.fields[i]) { difference -= time.fields[i]; down = 0; } else { difference += maxFields[i] + 1 - time.fields[i]; down = -1; } result.fields[i] = difference; } result.fields[DAY] = fields[DAY] - time.fields[DAY] + down; return result; }
/** * 获得时间字段的分隔符 * @return */ public String getTimeSeparator() { return timeSeparator; } /** * 设置时间字段的分隔符(用于字符串格式的时间) * @param timeSeparator 分隔符字符串 */ public void setTimeSeparator(String timeSeparator) { this.timeSeparator = timeSeparator; } /** * 正则表达式引用处理方法,源自 JDK @link java.util.regex.Pattern#quote(String) */ private String patternQuote(String s) { int slashEIndex = s.indexOf("\\E"); if (slashEIndex == -1) return "\\Q" + s + "\\E"; StringBuilder sb = new StringBuilder(s.length() * 2); sb.append("\\Q"); slashEIndex = 0; int current = 0; while ((slashEIndex = s.indexOf("\\E", current)) != -1) { sb.append(s.substring(current, slashEIndex)); current = slashEIndex + 2; sb.append("\\E\\\\E\\Q"); } sb.append(s.substring(current, s.length())); sb.append("\\E"); return sb.toString(); } public String toString() { DecimalFormat df = new DecimalFormat("00"); return new StringBuffer().append(fields[DAY]).append(", ") .append(df.format(fields[HOUR])).append(timeSeparator) .append(df.format(fields[MINUTE])).append(timeSeparator) .append(df.format(fields[SECOND])) .toString(); } public int hashCode() { final int PRIME = 31; int result = 1; result = PRIME * result + Arrays.hashCode(fields); return result; } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; final Time other = (Time) obj; if (!Arrays.equals(fields, other.fields)) { return false; } return true; } }
Calendar 类是一个抽象类,它为特定瞬间与一组诸如 YEAR、MONTH、DAY_OF_MONTH、HOUR 等 日历字段之间的转换提供了一些方法,并为操作日历字段(例如获得下星期的日期)提供了一些方法。瞬间可用毫秒值来表示,它是距历元(即格林威治标准时间 1970 年 1 月 1 日的 00:00:00.000,格里高利历)的偏移量。
public class MyDate extends Date {
public MyDate(Date d){
//自动把年月日换成某个固定的。
}}至于加减计算,myDate.getTime()后,自己算吧。
Time t1 = new Time(21, 0);
Time t2 = new Time(20, 5); Time diff = t1.subtractTime(t2);
System.out.println(diff);
System.out.println("Minute = " + diff.get(Time.MINUTE));
System.out.println("Second = " + diff.get(Time.SECOND));
}
}
import java.text.DecimalFormat;
import java.util.Arrays;/**
* 时间计算工具类
*
* @author bao110908
*/
public class Time { /**
* 时间字段常量,表示“秒”
*/
public final static int SECOND = 0;
/**
* 时间字段常量,表示“分”
*/
public final static int MINUTE = 1;
/**
* 时间字段常量,表示“时”
*/
public final static int HOUR = 2;
/**
* 时间字段常量,表示“天”
*/
public final static int DAY = 3; /**
* 各常量允许的最大值
*/
private final int[] maxFields = { 59, 59, 23, Integer.MAX_VALUE - 1 };
/**
* 各常量允许的最小值
*/
private final int[] minFields = { 0, 0, 0, Integer.MIN_VALUE };
/**
* 默认的字符串格式时间分隔符
*/
private String timeSeparator = ":";
/**
* 时间数据容器
*/
private int[] fields = new int[4];
/**
* 无参构造,将各字段置为 0
*/
public Time() {
this(0, 0, 0, 0);
} /**
* 使用时、分构造一个时间
* @param hour 小时
* @param minute 分钟
*/
public Time(int hour, int minute) {
this(0, hour, minute, 0);
} /**
* 使用时、分、秒构造一个时间
* @param hour 小时
* @param minute 分钟
* @param second 秒
*/
public Time(int hour, int minute, int second) {
this(0, hour, minute, second);
}
/**
* 使用一个字符串构造时间<br/>
* Time time = new Time("14:22:23");
* @param time 字符串格式的时间,默认采用“:”作为分隔符
*/
public Time(String time) {
this(time, null);
} /**
* 使用天、时、分、秒构造时间,进行全字符的构造
* @param day 天
* @param hour 时
* @param minute 分
* @param second 秒
*/
public Time(int day, int hour, int minute, int second) {
set(DAY, day);
set(HOUR, hour);
set(MINUTE, minute);
set(SECOND, second);
}
/**
* 使用一个字符串构造时间,指定分隔符<br/>
* Time time = new Time("14-22-23", "-");
* @param time 字符串格式的时间
*/
public Time(String time, String timeSeparator) {
if(timeSeparator != null) {
setTimeSeparator(timeSeparator);
}
String pattern = patternQuote(this.timeSeparator);
String matcher = new StringBuffer()
.append("\\d+?").append(pattern)
.append("\\d+?").append(pattern)
.append("\\d+?")
.toString();
if(!time.matches(matcher)) {
throw new IllegalArgumentException(time + ", time format error, HH"
+ this.timeSeparator + "mm" + this.timeSeparator + "ss");
}
String[] times = time.split(pattern);
set(DAY, 0);
set(HOUR, Integer.parseInt(times[0]));
set(MINUTE, Integer.parseInt(times[1]));
set(SECOND, Integer.parseInt(times[2]));
}
/**
* 设置时间字段的值
* @param field 时间字段常量
* @param value 时间字段的值
*/
public void set(int field, int value) {
if(value < minFields[field]) {
throw new IllegalArgumentException(value +
", time value must be positive.");
}
fields[field] = value % (maxFields[field] + 1);
// 进行进位计算
int carry = value / (maxFields[field] + 1);
if(carry > 0) {
int upFieldValue = get(field + 1);
set(field + 1, upFieldValue + carry);
}
} /**
* 获得时间字段的值
* @param field 时间字段常量
* @return 该时间字段的值
*/
public int get(int field) {
if(field < 0 || field > fields.length - 1) {
throw new IllegalArgumentException(field + ", field value is error.");
}
return fields[field];
} /**
* 将时间进行“加”运算,即加上一个时间
* @param time 需要加的时间
* @return 运算后的时间
*/
public Time addTime(Time time) {
Time result = new Time();
int up = 0; // 进位标志
for (int i = 0; i < fields.length; i++) {
int sum = fields[i] + time.fields[i] + up;
up = sum / (maxFields[i] + 1);
result.fields[i] = sum % (maxFields[i] + 1);
}
return result;
} /**
* 将时间进行“减”运算,即减去一个时间
* @param time 需要减的时间
* @return 运算后的时间
*/
public Time subtractTime(Time time) {
Time result = new Time();
int down = 0; // 退位标志
for (int i = 0, k = fields.length - 1; i < k; i++) {
int difference = fields[i] + down;
if (difference >= time.fields[i]) {
difference -= time.fields[i];
down = 0;
} else {
difference += maxFields[i] + 1 - time.fields[i];
down = -1;
}
result.fields[i] = difference;
}
result.fields[DAY] = fields[DAY] - time.fields[DAY] + down;
return result;
}
/**
* 获得时间字段的分隔符
* @return
*/
public String getTimeSeparator() {
return timeSeparator;
} /**
* 设置时间字段的分隔符(用于字符串格式的时间)
* @param timeSeparator 分隔符字符串
*/
public void setTimeSeparator(String timeSeparator) {
this.timeSeparator = timeSeparator;
} /**
* 正则表达式引用处理方法,源自 JDK @link java.util.regex.Pattern#quote(String)
*/
private String patternQuote(String s) {
int slashEIndex = s.indexOf("\\E");
if (slashEIndex == -1)
return "\\Q" + s + "\\E"; StringBuilder sb = new StringBuilder(s.length() * 2);
sb.append("\\Q");
slashEIndex = 0;
int current = 0;
while ((slashEIndex = s.indexOf("\\E", current)) != -1) {
sb.append(s.substring(current, slashEIndex));
current = slashEIndex + 2;
sb.append("\\E\\\\E\\Q");
}
sb.append(s.substring(current, s.length()));
sb.append("\\E");
return sb.toString();
} public String toString() {
DecimalFormat df = new DecimalFormat("00");
return new StringBuffer().append(fields[DAY]).append(", ")
.append(df.format(fields[HOUR])).append(timeSeparator)
.append(df.format(fields[MINUTE])).append(timeSeparator)
.append(df.format(fields[SECOND]))
.toString();
} public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + Arrays.hashCode(fields);
return result;
} public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final Time other = (Time) obj;
if (!Arrays.equals(fields, other.fields)) {
return false;
}
return true;
}
}
getTimes获取毫秒值,然后毫秒值按照int类型的加减方法加减,之后再把毫秒值转成时间截取里面的时分秒部分