java统计abc.txt文件中的单词数，行数，每个字符出现的百分比。并将结果写入result.txt文件中

下面是一个Java程序，可以实现你所需要的功能：

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

public class FileStats {
    public static void main(String[] args) {
        String inputFile = "abc.txt";
        String outputFile = "result.txt";

        try (BufferedReader reader = new BufferedReader(new FileReader(inputFile));
             BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile))) {

            int wordCount = 0;
            int lineCount = 0;
            Map<Character, Integer> charCounts = new HashMap<>();

            String line;
            while ((line = reader.readLine()) != null) {
                lineCount++;

                // Split the line into words
                String[] words = line.split("[^a-zA-Z]+");
                for (String word : words) {
                    if (!word.isEmpty()) {
                        wordCount++;

                        // Count the characters in the word
                        for (char c : word.toCharArray()) {
                            charCounts.put(c, charCounts.getOrDefault(c, 0) + 1);
                        }
                    }
                }
            }

            // Write the results to the output file
            writer.write(String.format("Word count: %d\n", wordCount));
            writer.write(String.format("Line count: %d\n", lineCount));
            writer.write("Character counts:\n");

            for (Map.Entry<Character, Integer> entry : charCounts.entrySet()) {
                char c = entry.getKey();
                int count = entry.getValue();
                double percent = ((double) count / wordCount) * 100;
                writer.write(String.format("%c: %d (%.2f%%)\n", c, count, percent));
            }

            System.out.println("Results written to " + outputFile);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

该程序使用了Java的文件输入输出库，以及Java的集合框架。它的思路是先读取输入文件的每一行，然后将每一行拆分成单词，再统计单词数和每个字符出现的次数。最后将结果写入输出文件。

你只需要将程序中的 `abc.txt` 和 `result.txt` 替换成你自己的文件名，即可使用。