testlinenumberreader.java

本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书

package apibook.c3.s10;

import java.io.*;

//测试LineNumberReader类
public class TestLineNumberReader {
  public TestLineNumberReader() {
  }
  public static void main(String[] args) {
    try {
        Reader in;
        String filename = "TestLineNumberReader.txt";
        in = new FileReader(filename);

          try {
              LineNumberReader lin = new LineNumberReader(in);
              PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
              String str;

              //readLine()自动加行号一，所以要减一
              while((str = lin.readLine()) != null) {
                  out.println(lin.getLineNumber()-1 + "\t" + str);
              }
              lin.close();                //关闭
              out.close();
          } catch (IOException e) {
              e.printStackTrace();
          }

    } catch (IOException e) {
        e.printStackTrace();
    }
  }

}