字符流缓冲区的增强类LineNumberReader之装饰模式

Posted 2020-10-22

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;

/**

• 模拟类LineNumberReader
• 特点能获得和设置行号
• @author WangShuang

• */
  public class Demo {

  public static void main(String[] args) {
  MyLineNumberReader r = null;
  try {
  FileReader fw = new FileReader("c:\字符流缓冲区.txt");
  r=new MyLineNumberReader(fw);
  String buff = null;
  while((buff=r.myReadLine())!=null){
  System.out.println(r.getMyLineNumber()+":"+buff);
  }

  } catch (Exception e) {
      throw new RuntimeException("读取错误");
  }finally {
      if(r!=null){
          try {
              r.close();
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
      }
  }

  }
  }
  class MyLineNumberReader extends BufferedReader{
  private int myLineNumber;//行号计数器
  public MyLineNumberReader(Reader in) {

  super(in);

  }
  public String myReadLine() throws IOException{
  myLineNumber++;
  return super.readLine();
  }
  public int getMyLineNumber() {
  return myLineNumber;
  }
  public void setMyLineNumber(int myLineNumber) {
  this.myLineNumber = myLineNumber;
  }

}