File handling in java | Sharp Tutorial

Programming in Java

Object Oriented in Java

Advanced topics in Java

File Handling

The classes for file read and write are also present in java.io package .

Even java has many ways to read data from a given file, one of which we are using as following :

This program will display all the contents of a given file on the console .

import java.io.*; 
public class ReadFileExample
{ 
  public static void main(String args[])
  { 
    try{
    File file = new File("C:\\Users\\sharp\\Desktop\\test.txt");
      FileReader fr=new FileReader(file);
      BufferedReader br = new BufferedReader(fr);

String s=null;
while ((s = br.readLine()) != null)
System.out.println(s);
}

catch(Exception ex)

{

System.out.println(“Exception=”+ex);

}
}
}

Java program to write the contents into a file :

import java.io.*;
class FileWriterDemo
{ 
    public static void main(String[] args) throws IOException 
    { 
        
        
        try{
           File file = new File("C:\\Users\\sharp\\Desktop\\out.txt"); //file being created if it does not exist.     
           FileWriter fw=new FileWriter(file); 
           fw.write("Content to be written"); 
           fw.close(); 
		   System.out.println("File written"); 
		   }
		   catch(Exception ex)
		   {
		   System.out.println("Exception is"+ex);
		   }
		   
    } 
}