设计模式-装饰设计模式

import java.io.*;

class MyBufferedReader
{
    private FileReader fileReader;

    public MyBufferedReader(FileReader fileReader)
    {
        this.fileReader = fileReader;
    }

    public String MyReadLine()throws IOException
    {
        StringBuilder sb = new StringBuilder();

        int readNum = 0;
        while((readNum = fileReader.read()) != -1)
        {
            char readChar = (char)readNum;
            if(readChar ==‘\n‘ || readChar == ‘\r‘)
                return sb.toString();
            else
                sb.append(readChar);
        }

        return null;
    }
}