从文本文件和总和数据读取数据 [英] Read Data From Text File And Sum Numbers
本文介绍了从文本文件和总和数据读取数据的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想从一个充满整数的文本文件中读取数据,并让程序将这些整数打印到屏幕上,同时将它们相加。这应该不难,但我无法弄清楚!!!
I want to read in data from a text file which is full of integers and have the program print those integers out to the screen while summing them. This shouldn't be hard, but I can't figure it out!!!
这是极其简化的文本文件:
Here is the extremely simplified text file:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
这是我的代码应该工作:
And here is my code that is supposed to work:
import java.util.*;
import java.io.File;
import java.io.IOException;
public class ReadFile
{
public static void main(String[] args)
throws IOException
{
Scanner textfile = new Scanner(new File("Some_Numbers.txt"));
filereader(textfile);
}
static void filereader(Scanner textfile)
{
int i = 0;
int sum = 0;
while(i <= 19)
{
System.out.println(textfile.nextInt());
sum = sum + textfile.nextInt();
i++;
}
}
}
最后,这是我得到的输出:
Finally, here is the output I get:
1
3
5
7
9
11
13
15
17
19
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:838)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at ReadFile.filereader(ReadFile.java:23)
at ReadFile.main(ReadFile.java:12)
推荐答案
您正在调用textfile。 nextInt()在循环中两次。尝试:
You are calling textfile.nextInt() twice in the loop. Try:
static void filereader(Scanner textfile)
{
int i = 0;
int sum = 0;
while(i <= 19)
{
int nextInt = textfile.nextInt();
System.out.println(nextInt);
sum = sum + nextInt;
i++;
}
}
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