2021-09-01 IO流(LineNumberReader)

BufferedReader
LineNumberReader

import java.io.FileReader;
import java.io.LineNumberReader;

public class LineNumberReaderDemo {

    public static void main(String[] args) throws Exception {
        FileReader fileReader = new FileReader("E:\\FileReaderDemo.java");
        LineNumberReader lineNumberReader = new LineNumberReader(fileReader);
//        lineNumberReader.setLineNumber(100); // 设置第一行序号为100
        String line;
        while ((line = lineNumberReader.readLine()) != null) {
            System.out.println(lineNumberReader.getLineNumber() + ": " + line);
        }
        lineNumberReader.close();
    }

}