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Sample: File Operation In JAVA

1. Transfer File Content One to Another


Code>>


import java.io.*;
class jFile
{
    public static void main(String args[])
    {
        File inFile=new File("Input.txt");//Existing File
        File outFile=new File("Output.txt");
        FileReader ins=null;
        FileWriter outs=null;
        try
        {
            ins=new FileReader(inFile);
            outs=new FileWriter(outFile);
            int ch;
            while((ch=ins.read())!=-1)
            {
                outs.write(ch);
            }            
        }catch(Exception e)
        {
            System.out.println(e.getMessage());
        }finally
        {
            try{
                ins.close();
                outs.close();
            }catch(Exception ex)
            {}
        }
    }
}


2. Writing Bytes to FILE


Code>>
import java.io.*;
class jBytes
{
    public static void main(String args[])
    {
        try{ 
       byte cites[]={'D','E','L','H','I','\n','K','O','L','K','A','T','A'};
       FileOutputStream outfile=null;
       outfile=new FileOutputStream("City.txt");
       outfile.write(cites);
       outfile.close();
        }catch(Exception e)
        {}

     }
}


3. Reading Bytes from FILE
Code>>
import java.io.*;
public class jBytesCopy 
{
    public static void main(String args[])
    {
        try
        {
            FileInputStream inFile=null;
            int b;
            inFile=new FileInputStream("city.txt");
            while((b=inFile.read())!=-1)
            {
                System.out.println((char)b);
            }
        }catch(Exception e)
        {
            System.out.println(e.getMessage());
        }
    }
}

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