Question

用java编写给定一个文件和字符，查询字符出现的次数

Answer 1

简单写下，思路大概是将文件流里的读到字节数组中，然后在通过字符串将其转化成字符数组：

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
public class Test{
    static int totalCount(String fileName, char ch) throws Exception{
        int count = 0;
        InputStream inStream = new FileInputStream(new File(fileName));
        byte[] buf = new byte[inStream.available()];
        inStream.read(buf);
        String str = new String(buf);
        char[] charArray = str.toCharArray();
        for(char c : charArray){
            if(c == ch){
                count ++;
            }
        }
        inStream.close();
        return count;
    }
       
       
    public static void main(String[] args) throws Exception {
        System.out.println("D://t.txt : " + totalCount("D://t.txt",'a'));
    }
}

Answer 2

加油

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这问题不算很难，却要全部的代码，不太合适