1 import java.util.Scanner;
2
3 public class test
4 {
5 public static void main(String[] args)
6 {
7 int i = 0;
8 float f = 0.0f;
9
10 Scanner scanner = new Scanner(System.in);
11
12 System.out.println("请输入整数：");
13 if(scanner.hasNextInt())
14 {
15 i = scanner.nextInt();
16 System.out.println("整数数据为："+i);
17 }
18 else
19 {
20 System.out.print("输入的数据不是整数数据！");
21 }
22 //////////////////////////////////////////////////
23 System.out.println("请输入小数：");
24 if(scanner.hasNextFloat())
25 {
26 f = scanner.nextFloat();
27 System.out.println("小数数据为："+f);
28 }
29 else
30 {
31 System.out.println("输入的数据不是小数数据！");
32 }
33
34 scanner.close();
35 }
36 }
1 import java.util.Scanner;
2
3 public class test
4 {
5 public static void main(String[] args)
6 {
7 double sum = 0;//用于记录输入的总和
8 double num = 0;//用于记录输入的个数
9
10 Scanner scanner = new Scanner(System.in);
11 while(scanner.hasNextDouble())
12 {
13 double x = scanner.nextDouble();
14 num++;
15 sum = sum+x;
16 }
17 System.out.println(num+"个数据的总和为："+sum);
18 System.out.println(num+"个数据的平均值为："+sum/num);
19 scanner.close();
20 }
21 }
