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luobin7
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chapter03
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ScannerTest.java
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main
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-java-
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JavaSECode
/
chapter03
/
src
/
ScannerTest.java
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/*
如何从键盘获取不同类型(基本数据类型、String类型)的变量:使用Scanner类。
1. 使用Scanner获取不同类型数据的步骤
步骤1:导包 import java.util.Scanner;
步骤2:提供(或创建)一个Scanner类的实例
步骤3:调用Scanner类中的方法,获取指定类型的变量 (nextXxx())
步骤4:关闭资源,调用Scanner类的close()
2. 案例:小明注册某交友网站,要求录入个人相关信息。如下:
请输入你的网名、你的年龄、你的体重、你是否单身、你的性别等情况。
3. Scanner类中提供了获取byte \ short \ int \ long \float \double \boolean \ String类型变量的方法。
注意,没有提供获取char类型变量的方法。需要使用next().charAt(0)
*/
//步骤1:导包 import java.util.Scanner;
import
java
.
util
.
Scanner
;
class
ScannerTest
{
public
static
void
main
(
String
[]
args
) {
//步骤2:提供(或创建)一个Scanner类的实例
Scanner
scan
=
new
Scanner
(
System
.
in
);
System
.
out
.
println
(
"欢迎光临你来我往交友网"
);
System
.
out
.
print
(
"请输入你的网名:"
);
//步骤3:调用Scanner类中的方法,获取指定类型的变量
String
name
=
scan
.
next
();
System
.
out
.
print
(
"请输入你的年龄:"
);
int
age
=
scan
.
nextInt
();
System
.
out
.
print
(
"请输入你的体重:"
);
double
weight
=
scan
.
nextDouble
();
System
.
out
.
print
(
"你是否单身(单身:true;不单身:false):"
);
boolean
isSingle
=
scan
.
nextBoolean
();
System
.
out
.
print
(
"请输入你的性别(男
\\
女):"
);
char
gender
=
scan
.
next
().
charAt
(
0
);
System
.
out
.
println
(
"网名:"
+
name
+
",年龄: "
+
age
+
",体重:"
+
weight
+
",是否单身:"
+
isSingle
+
",性别:"
+
gender
);
System
.
out
.
println
(
"注册完成,欢迎继续进入体验!"
);
//步骤4:关闭资源,调用Scanner类的close()
scan
.
close
();
}
}
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