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luobin7
-java-
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-java-
/
JavaSECode
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chapter03
/
src
/
SwitchCaseTest2.java
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78 lines (68 loc) · 1.48 KB
main
Breadcrumbs
-java-
/
JavaSECode
/
chapter03
/
src
/
SwitchCaseTest2.java
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/*
案例:编写程序:从键盘上输入2023年的“month”和“day”,要求通过程序输出输入的日期为2023年的第几天。
*/
import
java
.
util
.
Scanner
;
class
SwitchCaseTest2
{
public
static
void
main
(
String
[]
args
) {
//1.使用Scanner,从键盘获取2023年的month、day
Scanner
input
=
new
Scanner
(
System
.
in
);
System
.
out
.
println
(
"请输入2023年的月份:"
);
int
month
=
input
.
nextInt
();
//阻塞式方法
System
.
out
.
println
(
"请输入2023年的天:"
);
int
day
=
input
.
nextInt
();
//假设用户输入的数据是合法的。后期我们在开发中,使用正则表达式进行校验。
//2. 使用switch-case实现分支结构
int
sumDays
=
0
;
//记录总天数
//方式1:不推荐。存在数据的冗余
/*
switch(month){
case 1:
sumDays = day;
break;
case 2:
sumDays = 31 + day;
break;
case 3:
sumDays = 31 + 28 + day;
break;
case 4:
sumDays = 31 + 28 + 31 + day;
break;
//...
case 12:
sumDays = 31 + 28 + ... + 30 + day;
break;
}
*/
//方式2:
switch
(
month
){
case
12
:
sumDays
+=
30
;
case
11
:
sumDays
+=
31
;
case
10
:
sumDays
+=
30
;
case
9
:
sumDays
+=
31
;
case
8
:
sumDays
+=
31
;
case
7
:
sumDays
+=
30
;
case
6
:
sumDays
+=
31
;
case
5
:
sumDays
+=
30
;
case
4
:
sumDays
+=
31
;
case
3
:
sumDays
+=
28
;
//28:2月份的总天数
case
2
:
sumDays
+=
31
;
//31:1月份的总天数
case
1
:
sumDays
+=
day
;
//break;
}
System
.
out
.
println
(
"2023年"
+
month
+
"月"
+
day
+
"日是当前的第"
+
sumDays
+
"天"
);
input
.
close
();
//为了防止内存泄漏
}
}
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