```java
package com.kuangstudy.scanner;
import java.util.Scanner;
public class Demo04 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
//从键盘接收数据
int i = 0;
float f =0.0f;
System.out.println("请输入整数:");
//如果.....那么.......
if (scanner.hasNextInt()){
i= scanner.nextInt();
System.out.println("整数数据:"+i);
}else {
System.out.println("输入的不是整数数据!");
}
System.out.println("请输入小数:");
//如果.....那么.......
if (scanner.hasNextFloat()){
f= scanner.nextFloat();
System.out.println("小数数据:"+f);
}else {
System.out.println("输入的不是小数数据!");
}
scanner.close();
}
}
```
```java
package com.kuangstudy.scanner;
import java.util.Scanner;
public class Demo05 {
public static void main(String[] args) {
//我们可以输入多个数字,并且求其总和与平均数,每输入一个数字用回车确认,通过输入非数字来结束输入并输出执行结果;
Scanner scanner = new Scanner(System.in);
//和
double sum =0;
//计算输入了多少个数字
int m = 0;
System.out.println("请输入数据:");
//通过循环判断是否还有输入,并在里面对每一次进行求和统计
while (scanner.hasNextDouble()){
double x =scanner.nextDouble();
m = m+1;
sum = sum+x;
System.out.println("你输入了第"+m+"个数据,当前结果sum"+sum);
}
System.out.println(m+"个数的和为"+sum);
System.out.println(m+"个数的平均值是"+(sum/m));
scanner.close();
}
}
```