File operators
EXPLANATION : - File operations involve interacting with files on a computer system, allowing you to create, read, write, and delete files. Common operations include:
1. Open a file – Access a file to read or modify it.
2. Read from a file– Extract data from the file.
3. Write to a file– Add or modify data in the file.
4. Close a file– End the interaction with the file to free up system resources.
5. Delete a file – Remove the file from the system.
These actions help manage data in programs and applicationsapplications
PROGRAM:-
import java.io.File;
import java.io.*;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
class FSC{
public static void main(String args[])throws IOException
{
int i;
DataInputStream d = new DataInputStream(System.in);
String fileName = "msc1.txt";
do
{
System.out.println("\nwhich type of file operation you want to perform?");
System.out.println("\n1.file creation\n2.read\n3.write\n4.update\n5.delete");
System.out.println("Enter your choice:");
i= Integer.parseInt(d.readLine());
switch(i)
{
case 1:
createFile(fileName);
break;
case 2:
readFromFile(fileName);
break;
case 3:
writeToFile(fileName, "Hello!");
break;
case 4:
updateFile(fileName, "\nThis is an appended line.");
break;
case 5:
deleteFile(fileName);
break;
default:
System.out.println("enter choice 1-4");
}
}while(i<=5);
}
public static void createFile(String fileName)
{
File file = new File(fileName);
try
{
if (file.createNewFile())
{
System.out.println("File created: " + file.get");
}
else {
System.out.println("File already exists.");
}
}catch(Exception ex){}
}
public static void writeToFile(String fileName, String content)
{
try
{
FileWriter writer = new FileWriter(fileName);
writer.write(content)
System.out.println("Successfully wrote to the file.");
writer.flush();
writer.close();
}
catch (IOException e) {
System.out.println("An error occurred while writing to the file.");
}
}
public static void updateFile(String fileName, String content)
{
try {
FileWriter writer = new FileWriter(fileName, true);
writer.write(content);
System.out.println("Successfully updated the file.");
writer.flush();
writer.close();
}
catch (IOException e) {
System.out.println("An error occurred while updating the file.");
}
}
public static void readFromFile(String fileName)
{
try {
BufferedReader reader = new BufferedReader(new FileReader(fileName));
String line;
System.out.println("Reading from file:");
while ((line = reader.readLine()) != null)
{
System.out.println(line);
}
reader.close();
}
catch (IOException e) {
System.out.println("An error occurred while reading from the file.");
}
}
public static void deleteFile(String fileName)
{
File file = new File(fileName);
if (file.delete())
{
System.out.println("Deleted the file: " + file.getName());
}
else {
System.out.println("Failed to delete the file.");
}
}
}
Output:
which type of file operation you want to perform?
1.file creation
2.read
3.write
4.update
5.delete
Enter your choice:
1
File created: msc1.txt
which type of file operation you want to perform?
1.file creation
2.read
3.write
4.update
5.delete
Enter your choice:
5
Deleted the file: msc1.txt
which type of file operation you want to perform?
1.file creation
2.read
3.write
4.update
5.delete
Enter your choice:
3
Successfully wrote to the file.
which type of file operation you want to perform?
1.file creation
2.read
3.write
4.update
5.delete
Enter your choice:
6
enter choice 1-4
