LineNumberReader的实现

Posted 2020-12-05 coolcpp

import java.io.*;

public class MyLineNumberReader extends BufferedReader
{
    private int line = 0;  //行号
    public MyLineNumberReader(Reader r)
    {
        super(r);
    }
    
    public void setLineNumber(int lineNumber)
    {
        this.line = lineNumber;
    }
    
    public String myReadLine() throws IOException
    {
        line++;
        return super.readLine();
    }
    
    public int getLine()
    {
        return line;
    }
    
    public static void main(String[] args) throws IOException {
        FileReader fr = new FileReader("buf_copy.txt");
        
        MyLineNumberReader mlnr = new MyLineNumberReader(fr);
        
        String line = null;
        mlnr.setLineNumber(2);
        while((line = mlnr.myReadLine()) != null)
        {
            System.out.println(mlnr.getLine() + ":" + line);
        }
        
        mlnr.close();
    }
}