reverse.java.save

是内存受限系统设计的代码。

 
/* ***************************************************
   Data Chaining Example.  
   Reversing a text file
   ***************************************************
   */

import  java.io.*;

class Reverse
    // Reverses each line in a file
{
    public static void main( String args[] )
    {
	if (args.length != 1)
	    {
		System.err.println( "Usage: Reverse <filename>" );
		return;
	    }

	Reverse self=new Reverse( args[0] );
	self.Run();
        System.out.println( "Reverse completed" );
    }

    public Reverse( String _filename )
    {
	try {
	reader = new BufferedReader(new FileReader(_filename ));
	} 
	catch (FileNotFoundException ex) {
	    System.err.print(ex);
	    System.exit(-1);
	}
	writer = new BufferedWriter(new OutputStreamWriter(System.out));
    }

    public void Run() {
	String line;
	StringBuffer lineBuffer;
	try  {
	    while ((line = reader.readLine())!=null) {
		lineBuffer = new StringBuffer(line);
		lineBuffer.reverse();
		writer.write(lineBuffer.toString());
		writer.newLine();
	    }
	    writer.flush();
	    writer.close();
	}
	catch (IOException ex) {
	    System.err.print(ex);
	    System.exit(-1);
	}
    }

protected BufferedReader reader;
protected BufferedWriter writer;
};