java - 读取文本文件: Error - Variable out of type FileWriter

Question

import java.io.*;
import java.util.*;

class Permutation { 
    static void combinationUtil(int arr[], int n, int r, FileWriter out, int index,int data[], int i)
    {
       if (index == r)
        {
            for (int j=0; j<r; j++)
              out.print(data[j]+"  ");
              out.println(" ");

        return;
        }


        if (i >= n)
        return;


        data[index] = arr[i];
        combinationUtil(arr, n, r, out, index+1, data, i+1);
        combinationUtil(arr, n, r, out, index, data, i+1);      
    }


    static void printCombination(int arr[], int n, int r, FileWriter out)
    {

        int data[]=new int[r];
        combinationUtil(arr, n, r,out, 0, data, 0);
    }


    public static void main (String[] args) {
      File file = new File("output.txt");
      file.createNewFile();
      FileWriter out = new FileWriter(file); 
      int arr[] = {1, 2, 3, 4, 5, 6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28};
      int r = 6;
      int n = arr.length;
      printCombination(arr, n, r, out); 
      out.flush();
      out.close();   
    }//end main
}//end calss

错误

C:\Users\Student\Documents\Permutation.java:21: error: cannot find symbol out.print(data[j]+" "); ^ symbol: method print(String) location: variable out of type FileWriter 1 error

流程完成。
纠正此错误帮助时遇到问题。我尝试使用单独的函数传递它，但没有用。

Answer 1

out是System的静态成员，应称为此类System.out.print(data[j]+" ")。