File Handling in Java…

File handling

File handling is an important part of any application. Java has several methods for creating, reading, updating, and deleting files.

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The File class from the java.io package, allows us to work with files. To use the File class, create an object of the class, and specify the filename or directory name

import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;

public class day5fileH{
    public static void main(String[] args) {
//create

        try{
            if(file.createNewFile())
            {
            System.out.println("created successfully");
            }
            else{
                System.out.println("file already exists");
            } 
        }
            catch(Exception e){
                System.out.println("file not created");
            }

    }
}

import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;

public class day5fileH{
    public static void main(String[] args) {
//read

try{
            File a = new File("abc.txt");
            Scanner b = new Scanner(a);
            while(b.hasNextLine()){
                System.out.println(b.nextLine());
                }

        }catch(Exception e){
            System.out.println("File not found");
        }
    }
}

import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;

public class day5fileH{
    public static void main(String[] args) {
//write
        try{
            FileWriter a = new FileWriter("abc.txt");
            a.write("Hello World");
            a.close();
            System.out.println("File written successfully");
            }catch(Exception f){
                System.out.println("File can not be written");
        }
}
}

import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;

public class day5fileH{
    public static void main(String[] args) {
        
//delete
        File a = new File("abcd.txt");

        if(a.exists()){
            a.delete();
            System.out.println("file deleted successfully");
        }
        else{
           System.out.println("file not found");
          
        }

        
    }
}

import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;

public class day5fileH{
    public static void main(String[] args) {

// file details

        File file = new File("C:\\Users\\ANJALI\\Desktop\\JAVA\\Online Class\\topics.txt");
        if(file.exists()){
            // System.out.println("File found");
            System.out.println("File name is: "+ file.getName());
            System.out.println("Path is: "+ file.getAbsolutePath());
            System.out.println("Parent  is: "+ file.getParent());
            System.out.println("File size is: "+ file.length());
            System.out.println("File is readble: "+ file.canRead());
            System.out.println("File is writeable: "+ file.canWrite());

        }
        else{
            System.out.println("File not found");
            }
    }
}

The File class has many useful methods for creating and getting information about files.