Question

我这里有一个程序，它应该读入文件并计算文件中文本的密度，然后在图表中显示结果。到目前为止，它在输入文本时起作用，但是当我试图将其设置为读取文件时我收到了缓冲读取器的错误（我在错误的行上放了*）而且我在分析文件名时分析文件中的文本时遇到了问题。

非常感谢任何帮助

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.Scanner;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BiConsumer;
public class assignment
{
    static boolean drawn = false;
    static final int num = 4;
    BufferedReader bf = null;

    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.println("please enter a file name");
        String filename = in.nextLine();
        *bf = new BufferedReader(new FileReader(filename));* 
        String[] data = {filename};
        diagram(data);
        in.close();
    }

    public static void diagram(String[] lines)
    {
        Map<Character, Integer> words = new HashMap<Character, Integer>();

        for(String l : lines)
        {
            for(String w : l.split("\\s+"))
                for(char c : w.trim().toCharArray())                
                    if(words.containsKey(c))
                        words.put(c, words.get(c) + 1);
                    else
                        words.put(c, 1);
        }

        //first the most occuring then the printing
        words.forEach(new BiConsumer<Character, Integer>(){
            int i;

            @Override
            public void accept(Character t, Integer u)
            {
                if(u > i){
                    i = u;
                    rdraw(words, i);
                }
            }

        });
    }

    private static void rdraw(Map<Character, Integer> words, final int l)
    {
        if(drawn)
            return;

        words.forEach(new BiConsumer<Character, Integer>(){

            @Override
            public void accept(Character t, Integer u)
            {
                System.out.print(t + ": ");
                double d = (u * num)/l; 
                for(int i = 0; i < (int)d; i++)
                    System.out.print("=");
                System.out.println();
            }

        });

        drawn = true;
    }
}

Answer 1

如果您想阅读文件，请按以下步骤操作：

Scanner in = new Scanner(System.in);
System.out.println("please enter a file name");
String filename = in.nextLine();
in.close();
File file = new File(filename);
ArrayList<String> list = new ArrayList(); // Cant use a regular array because the length is unknown.
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
    list.add(line);
}
br.close();

现在你有一个arraylist，它应该包含文件中的所有行，你可以使用它。

我如何区分文件名的文本和分析测试

1 个答案: