MyineNumberReader

import java.io.*;






class MyLineNumberReader extends MyBufferedReader
{
//private Reader r;//先有流对象
private int lineNumber;
//同时把被装饰的对象传递进来
MyLineNumberReader(FileReader r)
{
super(r);
}
public String myReadLine() throws IOException//对外提供readLine方法
{
lineNumber++; //调用方法一次，行号就自增一次


return super.myReadLine();//super 父类的方法，提高复用
}


public void setLineNumber(int lineNumber)
{
this.lineNumber = lineNumber;
}
public int getLineNumber()
{
return lineNumber;
}

}


class  MyLineNumberReaderDemo
{
public static void main(String[] args) throws IOException
{
FileReader fr = new FileReader("PersonDemo1.java");//关联文件


MyLineNumberReader mylnr = new MyLineNumberReader(fr);//把类型对象传进


String line = null;


mylnr.setLineNumber(100);


while((line=mylnr.myReadLine())!=null)
{
System.out.println(mylnr.getLineNumber()+"::"+line);
}
mylnr.myClose();


}
}


/*
class MyLineNumberReader
{
private Reader r;//先有流对象
private int lineNumber;
//同时把被装饰的对象传递进来
MyLineNumberReader(Reader r)
{
this.r = r;
}
public String myReadLine() throws IOException//对外提供readLine方法
{
lineNumber++; //调用方法一次，行号就自增一次


StringBuilder sb = new StringBuilder();


int ch = 0;
while ((ch=r.read())!=-1)
{
if(ch=='\r')
continue;
if(ch=='\n')
return sb.toString();
else
sb.append((char)ch);
}
if(sb.length()!=0)
return sb.toString();
return null;
}


public void setLineNumber(int lineNumber)
{
this.lineNumber = lineNumber;
}
public int getLineNumber()
{
return lineNumber;
}
public void myClose() throws IOException
{
r.close();
}
}


class  MyLineNumberReaderDemo
{
public static void main(String[] args) throws IOException
{
FileReader fr = new FileReader("PersonDemo1.java");//关联文件


MyLineNumberReader mylnr = new MyLineNumberReader(fr);//把类型对象传进


String line = null;


mylnr.setLineNumber(100);


while((line=mylnr.myReadLine())!=null)
{
System.out.println(mylnr.getLineNumber()+"::"+line);
}
mylnr.myClose();


}
}
*/