Eclipse普通java Project文件路径问题

项目的结构如图

读取src里某个包下的文件，代码如下

BufferedReader br=new BufferedReader(new FileReader("src/ch01/practice1/input.txt"));

输出到同一目录下，代码如下

PrintWriter pw=new PrintWriter("src/ch01/practice1/output.txt");

整个算法代码如下

package ch01.practice1;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
//import java.util.Arrays;

//统计数字问题
public class PageNuber
{
    public static void main(String[] args) throws IOException
    {
        BufferedReader br=new BufferedReader(new FileReader("src/ch01/practice1/input.txt"));
        String line=br.readLine();
        if (null!=line)
        {
            int n=Integer.valueOf(line);
            int[] arr= new int[10];
//          Arrays.fill(arr,0);
//          System.out.println(Arrays.toString(arr));
            for (int i = 1; i < n+1; i++)
            {
                int div=i;
                while(div>0)
                {
                    arr[div%10]++;
                    div=div/10;
                }
            }
//          System.out.println(Arrays.toString(arr));
            PrintWriter pw=new PrintWriter("src/ch01/practice1/output.txt");
            for (int i = 0; i < arr.length; i++)
            {
                pw.print(arr[i]+" ");
            }
            pw.close();
        }
        br.close();
    }
}

原文地址：https://www.cnblogs.com/linkchen/p/12368214.html