j_example1.java

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_Example.java
// 

// ////////////////////////////////////////////////////////

import java.io.*; 

public class J_Example1
{

    public static void main(String args[])
    {
        String inputString = "";
        try
        {
            //RandomAccessFile f =new RandomAccessFile("test.txt","rw");
            //int     i;
            //double  d=1.2222;
            
            
           // f.writeDouble(d);
            //System.out.println(d);
            
            RandomAccessFile inputReader = new RandomAccessFile("test.txt","rw");
			
			while(inputReader.getFilePointer()<inputReader.length())
				inputString = inputString+inputReader.readLine()+"\r\n";
			
			inputReader.close();
			
			System.out.println(inputString);
			
			
			RandomAccessFile outputReader = new RandomAccessFile("test2.txt","rw");
			outputReader.writeChar(97);
            
 //           for (i= 0; i< 10; i++)
 //               f.writeDouble(Math.PI*i);
            /*
            f.seek(16);
            f.writeDouble(0);
            f.seek(0);
            for (i= 0; i< 10; i++)
            {
                d=f.readDouble( );
                System.out.println("["+i+"]: "+d);
            }*/
//            f.close( );
        }
        catch (IOException io)
        {
            System.out.println(io);
            System.exit(-1);
        }// End of try-catch structure.
    } // End of method: main

} // End of class: J_Example