IO操作模拟一下BufferedReader和LineNumberReader

以你之姓@ 2022-05-17 05:04 170阅读 0赞

/* 
    * 程序头部注释开始   
    * 程序的版权和版本声明部分   
    * Copyright (c) 2011, 烟台大学计算机学院学生   
    * All rights reserved.   
    * 文件名称：模拟一下BufferedReader和LineNumberReader                         
    * 作    者：薛广晨                               
    * 完成日期：2012  年 11 月  04  日   
    * 版 本号：x1.0            
       
    * 对任务及求解方法的描述部分   
    * 输入描述：  
    * 问题描述: 模拟一下BufferedReader
    * 程序输出：   
    * 程序头部的注释结束 
    */
    
    import java.io.*;
    class MyBufferedReader
    {
    	private Reader r;
    
    	MyBufferedReader(Reader r)
    	{
    		this.r = r;
    	}
    
    	public String myReadLine() throws IOException
    	{
    		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 myClose() throws IOException
    	{
    		r.close();
    	}
    
    }
    
    
    class MyBufferedReaderTest
    {
    	public static void main(String[] args)  throws IOException
    	{
    		FileReader fr = new FileReader("buf.txt");
    
    		MyBufferedReader myBuf = new MyBufferedReader(fr);
    
    		String line = null;
    
    		while((line = myBuf.myReadLine()) != null)
    		{
    			System.out.println(line);
    		}
    
    		myBuf.myClose();
    	}
    }
    
    
    
    import java.io.*;
    
    class MyLineNumberReader extends MyBufferedReader
    {
    	private int lineNumber;
    
    	MyLineNumberReader(Reader r)
    	{
    		super(r);
    	}
    
    	public void setLineNumber(int lineNumber)
    	{
    		this.lineNumber = lineNumber;
    	}
    	public int getLineNumber()
    	{
    		return this.lineNumber;
    	}
    
    	public String myReadLine() throws IOException
    	{
    		lineNumber++;
    
    		return super.myReadLine();
    	}
    }
    
    /*class MyLineNumberReader
    {
    	private Reader r;
    	private int lineNumber;
    
    	MyLineNumberReader(Reader r)
    	{
    		this.r = r;
    	}
    
    	public void setLineNumber(int lineNumber)
    	{
    		this.lineNumber = lineNumber;
    	}
    	public int getLineNumber()
    	{
    		return this.lineNumber;
    	}
    
    	public String myReadLine() throws IOException
    	{
    		lineNumber++;
    
    		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 myClose() throws IOException
    	{
    		r.close();
    	}
    }*/
    
    class MyLineNumberReaderTest 
    {
    	public static void main(String[] args) throws IOException
    	{
    		FileReader fr = new FileReader("MyLineNumberReaderTest.java");
    		
    		MyLineNumberReader mylnr = new MyLineNumberReader(fr);
    
    		String line = null;
    		
    		mylnr.setLineNumber(100);
    		while((line = mylnr.myReadLine()) != null)
    		{
    			System.out.println(mylnr.getLineNumber()+"::"+line);
    		}
    
    		mylnr.myClose();
    
    	}
    }