JAVA study notes: Use IO stream to see how many lines of programs you have written

JAVA uses the IO stream to see how many lines of program it has written

As a novice who has been in JAVA for a while, I believe many students have the idea of ​​checking how many lines of code they have written. This article uses a simple IO stream to achieve this function:

Main principle :
Using the **readLine()** method of the buffered stream BufferedReader , you can read line by line (but this method does not recognize line breaks, so the total number of output lines does not include blank lines).

code show as below:

import org.junit.Test;

import java.io.*;

public class Test {
    
    

int count;

    // 测试Java工作区代码的行数
    @Test
    public void test() {
    
    
        File firstFile = new File("d:/JAVA工作区"); // 这里放的是Java工作区（workplace）的文件目录，就是eclipse或者IDEA的工作区目录
        System.out.println(func(firstFile));
    }
// 求行数的函数
    public int func(File file) {
    
    
        if (file.isDirectory()) {
    
    
            File[] files = file.listFiles();
            for (var i = 0; i < files.length; i++) {
    
    
                func(files[i]);
            }
        } else {
    
    
            if (file.getName().endsWith(".java")) {
    
    
                BufferedReader br = null;
                try {
    
    
                    FileReader fr = new FileReader(file);
                    br = new BufferedReader(fr);
                    int len;
                    char[] cbuf = new char[20];

                    while ((len = br.read(cbuf)) != -1) {
    
    
                        String str = br.readLine();
                        count++;
                    }
                } catch (FileNotFoundException e) {
    
    
                    e.printStackTrace();
                } catch (IOException e) {
    
    
                    e.printStackTrace();
                } finally {
    
    
                    if (br != null) {
    
    
                        try {
    
    
                            br.close();
                        } catch (IOException e) {
    
    
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
        return count;
    }
}

I am also a JAVA novice. I hope you can give me your advice and leave a message to write down the deficiencies or improvements in this article. Thank you! ! !