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luobin7
-java-
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JavaSECode
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chapter03
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src
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IfElseTest.java
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main
Breadcrumbs
-java-
/
JavaSECode
/
chapter03
/
src
/
IfElseTest.java
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/*
分支结构1:if-else条件判断结构
1. 格式
格式1:
if(条件表达式){
语句块;
}
格式2:"二选一"
if(条件表达式) {
语句块1;
}else{
语句块2;
}
格式3:"多选一"
if (条件表达式1) {
语句块1;
} else if (条件表达式2) {
语句块2;
}
...
}else if (条件表达式n) {
语句块n;
} else {
语句块n+1;
}
*/
class
IfElseTest
{
public
static
void
main
(
String
[]
args
) {
/*
案例1:成年人心率的正常范围是每分钟60-100次。体检时,
如果心率不在此范围内,则提示需要做进一步的检查。
*/
int
heartBeats
=
89
;
//错误的写法:if(60 <= heartBeats <= 100){
if
(
heartBeats
<
60
||
heartBeats
>
100
){
System
.
out
.
println
(
"你需要做进一步的检查"
);
}
System
.
out
.
println
(
"体检结束"
);
//**********************************
/*
案例2:定义一个整数,判定是偶数还是奇数
*/
int
num
=
13
;
if
(
num
%
2
==
0
){
System
.
out
.
println
(
num
+
"是偶数"
);
}
else
{
System
.
out
.
println
(
num
+
"是奇数"
);
}
}
}
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