JAVA设计模式english

				import java.awt.*;
				import java.io.*;
				
				public class InputFile
				{
				RandomAccessFile f = null;
				boolean errflag;
				String s = null;
				 public InputFile(String fname) 
				 {
				 errflag = false;
				  try
				    {
				    //open file
				    f = new RandomAccessFile(fname, "r");
				    }
				   catch (IOException e)
				    {
				    //print error if not found
				     System.out.println("no file found");
				     errflag = true;    //and set flag
				    }
				  }
				//-----------------------------------------
				public boolean checkErr()
				 {
				 return errflag;
				 }
				//-----------------------------------------
				public String read()
				{
				//read a single field up to a comma or end of line
				String ret = "";
				if (s == null)          //if no data in string
				   {
				   s = readLine();      //read next line
				   }
				if (s != null)          //if there is data
				 {
				 s.trim();              //trim off blanks
				 int i = s.indexOf(",");  //find next comma
				 if (i 				  {
				  ret = s.trim();       //if no commas go to end of line
				  s = null;             //and null out stored string
				  }
				 else
				  {
				  ret = s.substring(0, i).trim(); //return left of comma      
				  s = s.substring(i+1); //save right of comma
				  }
				}
				else
				  ret = null;
				return ret;             //return string
				}
				//-----------------------------------------
				public String readLine()
				 {
				 //read in a line from the file
				 s = null;
				 try
				  {
				  s = f.readLine();     //could throw error
				  }
				 catch (IOException e)
				 {
				 errflag = true;
				 System.out.println("File read error");
				 }
				 return s;
				 }
				//-----------------------------------------
				public void close()
				{
				try
				 {
				 f.close();     //close file
				 }
				catch (IOException e)
				 {System.out.println("File close error");
				  errflag = true;
				 }
				}
				//-----------------------------------------
				}