对于任意3个整数，判断其是否为一个合法的日期值？
给定一个日期值，计算若干天数后的日期值。
如果有两个日期值，计算它们相距的天数。
我将这些功能写在了一个类里面。Test_2_6.java
使用Test_2_6_1.java，Test_2_6_2.java，Test_2_6_3.java 来使用Test_2_6.java
1
public class Test_2_6 ...{
2
private int LaterDayCount,LaterCurrentDay;
3
//判断是否为闰年
4
public boolean isLeapYear(int year)
5
...{
6
boolean leap=false;
7
leap=(year%400==0)|(year%100!=0)&(year%4==0);
8
return leap;
9
}
10
//是否是合法日期值
11
public boolean isDate(int year,int month,int day)
12
...{
13
boolean isDate=false;
14
if (month>0&&month<13&&year>0&&day>0)
15
...{
16
switch (month)
17
...{
18
case 1:if (day<32)
break;else return false;
19
case 2:
20
if (!isLeapYear(year))//不是闰年
21
...{
22
if (day<29)
break;else return false;
23
}
24
else//闰年
25
...{
26
if (day<28)
break;else return false;
27
}
28
case 3:if (day<32)
break;else return false;
29
case 4:if (day<31)
break;else return false;
30
case 5:if (day<32)
break;else return false;
31
case 6:if (day<31)
break;else return false;
32
case 7:if (day<31)
break;else return false;
33
case 8:if (day<32)
break;else return false;
34
case 9:if (day<31)
break;else return false;
35
case 10:if (day<32)
break;else return false;
36
case 11:if (day<31)
break;else return false;
37
case 12:if (day<32)
break;else return false;
38
}
39
isDate=true;
40
}
41
42
return isDate;
43
}
44
public boolean isDate(int year,int month)
45
...{
46
boolean isDate=false;
47
if (month>0&&month<13&&year>0) isDate=true;
48
return isDate;
49
}
50
public boolean isDate(int year)
51
...{
52
boolean isDate=false;
53
if (year>0) isDate=true;
54
return isDate;
55
}
56
//年历中,从第一天开始到某月的最后一天的天数总数。
57
public int DateCountTable(int year,int month)
58
...{
59
int DateCount=0;
60
if (this.isLeapYear(year))
61
...{
62
switch (month)
63
...{
64
case 1:DateCount=31;
break;
65
case 2:DateCount=31+29;
break;
66
case 3:DateCount=31+29+31;
break;
67
case 4:DateCount=31+29+31+30;
break;
68
case 5:DateCount=31+29+31+30+31;
break;
69
case 6:DateCount=31+29+31+30+31+30;
break;
70
case 7:DateCount=31+29+31+30+31+30+31;
break;
71
case 8:DateCount=31+29+31+30+31+30+31+31;
break;
72
case 9:DateCount=31+29+31+30+31+30+31+31+30;
break;
73
case 10:DateCount=31+29+31+30+31+30+31+31+30+31;
break;
74
case 11:DateCount=31+29+31+30+31+30+31+31+30+31+30;
break;
75
case 12:DateCount=31+29+31+30+31+30+31+31+30+31+30+31;
break;
76
}
77
}
78
else
79
...{
80
switch (month)
81
...{
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case 1:DateCount=31;
break;
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case 2:DateCount=31+28;
break;
84
case 3:DateCount=31+28+31;
break;
85
case 4:DateCount=31+28+31+30;
break;
86
case 5:DateCount=31+28+31+30+31;
break;
87
case 6:DateCount=31+28+31+30+31+30;
break;
88
case 7:DateCount=31+28+31+30+31+30+31;
break;
89
case 8:DateCount=31+28+31+30+31+30+31+31;
break;
90
case 9:DateCount=31+28+31+30+31+30+31+31+30;
break;
91
case 10:DateCount=31+28+31+30+31+30+31+31+30+31;
break;
92
case 11:DateCount=31+28+31+30+31+30+31+31+30+31+30;
break;
93
case 12:DateCount=31+28+31+30+31+30+31+31+30+31+30+31;
break;
94
}
95
}
96
97
return DateCount;
98
}
99
//某年一年内的天数
100
public int GetDateCountInYear(int year)
101
...{
102
int DateCount=0;
103
if (this.isLeapYear(year))
104
DateCount=366;
105
else
106
DateCount=365;
107
return DateCount;
108
}
109
//计算两个日期间的天数
110
public int GetDayCountBetweenTwoDate(int beforeYear,int beforeMonth,int beforeDay,int afterYear,int afterMonth,int afterDay)
111
...{
112
int DayCount=1;
113
//同年同月
114
if (beforeYear==afterYear&&beforeMonth==afterMonth)
115
...{
116
DayCount=afterDay-beforeDay+1;
117
return DayCount;
118
}
119
//同年不同月
120
if (beforeYear==afterYear)
121
...{
122
int aH=this.DateCountTable(afterYear,afterMonth);
123
int bH=this.DateCountTable(beforeYear,beforeMonth);
124
int
brD=this.getRemainDateNumberInMonth(beforeYear,beforeMonth,beforeDay);
125
int arD=this.getRemainDateNumberInMonth(afterYear,afterMonth,afterDay);
126
DayCount=(aH-(bH-
brD))-arD;
127
return DayCount;
128
}
129
130
//不同年
131
int currentYear;//yearCount=0;
132
//隔1年
133
//yearCount=afterYear-beforeYear-1;
134
135
for (currentYear=beforeYear+1;currentYear<afterYear;currentYear++)
136
...{
137
DayCount=+this.GetDateCountInYear(currentYear);
138
}
139
140
int DateCountInYear=this.GetDateCountInYear(beforeYear);
141
int bH=this.DateCountTable(beforeYear,beforeMonth);
142
int
brH=this.getRemainDateNumberInMonth(beforeYear,beforeMonth,beforeDay);
143
int aH=this.DateCountTable(afterYear,afterMonth);
144
int arH=this.getRemainDateNumberInMonth(afterYear,afterMonth,afterDay);
145
DayCount+= (DateCountInYear-(bH-
brH));
146
DayCount+= (aH-arH)-1;
147
return DayCount;
148
}
149
//计算若干天数后的日期值
150
public String getLaterDate(int year,int month,int day,int number)
151
...{
152
this.LaterCurrentDay=0;
153
this.LaterDayCount=number;
154
int currentYear=year,currentMonth=month;
155
//第二天算“后”的第一天
156
157
//如果 天数 大于该年剩余的天数，年数增加1，天数＝天数－该年剩余的天数
158
if (LaterDayCount>this.DateCountTable(year,12)-(this.DateCountTable(year,month)-day))
159
...{
160
LaterDayCount=LaterDayCount-(this.DateCountTable(year,12)-(this.DateCountTable(year,month)- this.getRemainDateNumberInMonth(year,month,day)));
161
currentYear++;
162
163
String tempDebug;
164
tempDebug=this.getLaterDate(currentYear,1,1,LaterDayCount);
165
}
166
//如果 天数 大于该月剩余的天数
167
if (LaterDayCount>this.getDateNumberInMonth(year,month)-day)
168
...{
169
170
LaterDayCount=LaterDayCount-(this.getRemainDateNumberInMonth(currentYear,currentMonth,day));
171
currentMonth++;
172
173
String tempDebug;
174
tempDebug=this.getLaterDate(currentYear,currentMonth,1,LaterDayCount);
175
176
}
177
else
178
...{
179
if (LaterDayCount==0) LaterDayCount=1;
180
LaterCurrentDay=LaterDayCount;
181
}
182
183
String laterDate,strCurrentYear,strCurrentMonth,strCurrentDay;
184
strCurrentYear=String.valueOf(currentYear);
185
strCurrentMonth=String.valueOf(currentMonth);
186
strCurrentDay=String.valueOf(LaterCurrentDay);
187
188
laterDate=strCurrentYear + "-" + strCurrentMonth+ "-" + strCurrentDay ;
189
190
return laterDate;
191
}
192
//某年中某月的天数
193
public int getDateNumberInMonth(int year,int month)
194
...{
195
if (!this.isDate(year,month)) return -1;
196
int DateNumberInMonth=0;
197
switch (month)
198
...{
199
case 1:DateNumberInMonth=31;
break;
200
case 2:
201
if (isLeapYear(year))//闰年
202
...{
203
DateNumberInMonth=29;
break;
204
}
205
else//非闰年
206
...{
207
DateNumberInMonth=28;
break;
208
}
209
case 3:DateNumberInMonth=31;
break;
210
case 4:DateNumberInMonth=30;
break;
211
case 5:DateNumberInMonth=31;
break;
212
case 6:DateNumberInMonth=30;
break;
213
case 7:DateNumberInMonth=31;
break;
214
case 8:DateNumberInMonth=31;
break;
215
case 9:DateNumberInMonth=30;
break;
216
case 10:DateNumberInMonth=31;
break;
217
case 11:DateNumberInMonth=30;
break;
218
case 12:DateNumberInMonth=31;
break;
219
}
220
return DateNumberInMonth;
221
}
222
//某年中某月中某日剩余的天数
223
public int getRemainDateNumberInMonth(int year,int month,int day)
224
...{
225
if (!isDate(year,month,day)) return -1;
226
int remainDateNumberInMonth=0,DateNumberInMonth=0;
227
DateNumberInMonth=this.getDateNumberInMonth(year,month);
228
remainDateNumberInMonth= DateNumberInMonth-day ;
229
return remainDateNumberInMonth;
230
}
231
}
232
1
import java.io.BufferedReader;
2
import java.io.IOException;
3
import java.io.InputStreamReader;
4
5
public class Test_2_6_1 ...{
6
public static void main (String args[]) throws IOException
7
...{
8
String strYear,strMonth,strDay;
9
int intYear,intMonth,intDay;
10
Test_2_6 tools=new Test_2_6();
11
12
System.out.println("判断任意3个整数是否为一个合法的日期（YYYY-MM-DD）");
13
14
//读取
15
System.out.println("请输入年:");
16
BufferedReader brYear = new BufferedReader(new InputStreamReader( System.in));
17
strYear =
brYear.readLine();
18
intYear=(int) Integer.parseInt(strYear);
19
20
System.out.println("请输入月:");
21
BufferedReader brMonth = new BufferedReader(new InputStreamReader( System.in));
22
strMonth =
brMonth.readLine();
23
intMonth=(int) Integer.parseInt(strMonth);
24
25
System.out.println("请输入天:");
26
BufferedReader brDay = new BufferedReader(new InputStreamReader( System.in));
27
strDay =
brDay.readLine();
28
intDay=(int) Integer.parseInt(strDay);
29
30
if (tools.isDate(intYear,intMonth,intDay))
31
...{
32
System.out.println("是有效的日期。");
33
}
34
else
35
...{
36
System.out.println("不是有效的日期。");
37
}
38
}
39
}
1
import java.io.*;
2
public class Test_2_6_2 ...{
3
public static void main (String args[]) throws IOException
4
...{
5
String strYear,strMonth,strDay,strNumber;
6
int intYear,intMonth,intDay,intNumber;
7
Test_2_6 tools=new Test_2_6();
8
9
10
System.out.println("给定一个日期，计算若干天数后的日期");
11
12
//读取
13
System.out.println("请输入年:");
14
BufferedReader brYear = new BufferedReader(new InputStreamReader( System.in));
15
strYear =
brYear.readLine();
16
intYear=(int) Integer.parseInt(strYear);
17
18
System.out.println("请输入月:");
19
BufferedReader brMonth = new BufferedReader(new InputStreamReader( System.in));
20
strMonth =
brMonth.readLine();
21
intMonth=(int) Integer.parseInt(strMonth);
22
23
System.out.println("请输入天:");
24
BufferedReader brDay = new BufferedReader(new InputStreamReader( System.in));
25
strDay =
brDay.readLine();
26
intDay=(int) Integer.parseInt(strDay);
27
28
System.out.println("请输入您将计算的天数:");
29
BufferedReader brNumber = new BufferedReader(new InputStreamReader( System.in));
30
strNumber =
brNumber.readLine();
31
intNumber=(int) Integer.parseInt(strNumber);
32
33
34
System.out.println(intYear + "-" + intMonth + "-" + intDay +" 之后的 " + intNumber + " 天是 " + tools.getLaterDate(intYear,intMonth,intDay,intNumber));
35
}
36
}
1
import java.io.*;
2
public class Test_2_6_3 ...{
3
public static void main (String args[]) throws IOException
4
...{
5
Test_2_6 tools=new Test_2_6();
6
7
System.out.println("计算给定两个日期相距的天数");
8
9
String strBeforeYear,strBeforeMonth,strBeforeDay,strAfterYear,strAfterMonth,strAfterDay;
10
int intBeforeYear,intBeforeMonth,intBeforeDay,intAfterYear,intAfterMonth,intAfterDay;
11
12
//读取
13
System.out.println("请输入年:");
14
BufferedReader brBeforeYear = new BufferedReader(new InputStreamReader( System.in));
15
strBeforeYear =
brBeforeYear.readLine();
16
intBeforeYear=(int) Integer.parseInt(strBeforeYear);
17
18
System.out.println("请输入月:");
19
BufferedReader brBeforeMonth = new BufferedReader(new InputStreamReader( System.in));
20
strBeforeMonth =
brBeforeMonth.readLine();
21
intBeforeMonth=(int) Integer.parseInt(strBeforeMonth);
22
23
System.out.println("请输入日:");
24
BufferedReader brBeforeDay = new BufferedReader(new InputStreamReader( System.in));
25
strBeforeDay =
brBeforeDay.readLine();
26
intBeforeDay=(int) Integer.parseInt(strBeforeDay);
27
28
System.out.println("请输入年:");
29
BufferedReader brAfterYear = new BufferedReader(new InputStreamReader( System.in));
30
strAfterYear =
brAfterYear.readLine();
31
intAfterYear=(int) Integer.parseInt(strAfterYear);
32
33
System.out.println("请输入月:");
34
BufferedReader brAfterMonth = new BufferedReader(new InputStreamReader( System.in));
35
strAfterMonth =
brAfterMonth.readLine();
36
intAfterMonth=(int) Integer.parseInt(strAfterMonth);
37
38
System.out.println("请输入日:");
39
BufferedReader brAfterDay = new BufferedReader(new InputStreamReader( System.in));
40
strAfterDay =
brAfterDay.readLine();
41
intAfterDay=(int) Integer.parseInt(strAfterDay);
42
43
44
System.out.println(tools.GetDayCountBetweenTwoDate(intBeforeYear,intBeforeMonth,intBeforeDay,intAfterYear,intAfterMonth,intAfterDay));
45
}
46
}
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