统计文件中的行数和字符数

Question

如题所述

Answer 1

在C盘新建文件1.txt，输入任意字符，

编写java代码。如下：

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.TreeMap;
 
public class Test {
    // ç»Ÿè®¡æ•°å­—或者字符出现的次数
    public static TreeMap<Character, Integer> Pross(String str) {
        char[] charArray = str.toCharArray();
 
        TreeMap<Character, Integer> tm = new TreeMap<Character, Integer>();
 
        for (int x = 0; x < charArray.length; x++) {
            if (!tm.containsKey(charArray[x])) {
                tm.put(charArray[x], 1);
            } else {
                int count = tm.get(charArray[x]) + 1;
                tm.put(charArray[x], count);
            }
        }
        return tm;
    }
 
    public static void main(String[] args) {
        BufferedReader br = null;
        int line = 0;
        String str = "";
        StringBuffer sb  = new StringBuffer();
        try {
            br = new BufferedReader(new FileReader("c:\\1.txt"));
            while ((str = br.readLine()) != null) {
                sb.append(str);
                ++line;
            }
            System.out.println("\n文件行数: " + line);
            System.out.println("\n文件内容: " + sb.toString());
            TreeMap<Character, Integer> tm = Pross(sb.toString());
            System.out.println("\n字符统计结果为：" + tm);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}