1. Create a New File
This program demonstrates how to create a new file using the File class. If the file already exists, an appropriate message is displayed.
import java.io.File;
import java.io.IOException;
public class CreateFileExample {
public static void main(String[] args) throws IOException {
File file = new File("Student.txt");
if (file.createNewFile()) {
System.out.println("File created successfully.");
} else {
System.out.println("File already exists.");
}
}
}Output:
File created successfully.2. Write Data to a File
This program writes text into a file using the FileWriter class. If the file does not exist, it is created automatically.
import java.io.FileWriter;
import java.io.IOException;
public class WriteFileExample {
public static void main(String[] args) throws IOException {
FileWriter writer = new FileWriter("Student.txt");
writer.write("Welcome to Java File Handling");
writer.write("\nLearning File Operations");
writer.close();
System.out.println("Data written successfully.");
}
}Output:
Data written successfully.
File(Student.txt) Data:
Welcome to Java File Handling
Learning File OperationsCode language: CSS (css)3. Read Data from a File
This program reads data from a file using the FileReader class. Each character is read one by one and displayed on the console.
import java.io.FileReader;
import java.io.IOException;
public class ReadFileExample {
public static void main(String[] args) throws IOException {
FileReader reader = new FileReader("Student.txt");
int ch;
System.out.println("File Contents:");
while ((ch = reader.read()) != -1) {
System.out.print((char) ch);
}
reader.close();
}
}Output:
File Contents:
Welcome to Java File Handling
Learning File Operations4. Append Data to a File
This program appends new text to an existing file. The existing file contents remain unchanged while new data is added at the end.
import java.io.FileWriter;
import java.io.IOException;
public class AppendFileExample {
public static void main(String[] args) throws IOException {
FileWriter writer = new FileWriter("Student.txt", true);
writer.write("\nJava Programming Lab");
writer.close();
System.out.println("Data appended successfully.");
}
}Output:
Data appended successfully.
File(Student.txt) Data:
Welcome to Java File Handling
Learning File Operations
Java Programming LabCode language: CSS (css)5. Display File Information
This program displays important information about a file. It shows the file name, path, size, and read/write permissions.
import java.io.File;
public class FileInformation {
public static void main(String[] args) {
File file = new File("Student.txt");
if (file.exists()) {
System.out.println("File Name : " + file.getName());
System.out.println("File Path : " + file.getAbsolutePath());
System.out.println("File Size : " + file.length() + " bytes");
System.out.println("Readable : " + file.canRead());
System.out.println("Writable : " + file.canWrite());
} else {
System.out.println("File does not exist.");
}
}
}Output:
File Name : Student.txt
File Path : D:\Testing\Student.txt
File Size : 75 bytes
Readable : true
Writable : trueCode language: JavaScript (javascript)6. Rename a File
This program renames an existing file using the renameTo() method. If the operation is successful, the new file name is displayed.
import java.io.File;
public class RenameFileExample {
public static void main(String[] args) {
File oldFile = new File("Student.txt");
File newFile = new File("StudentDetails.txt");
if (oldFile.renameTo(newFile)) {
System.out.println("File renamed successfully.");
} else {
System.out.println("Unable to rename the file.");
}
}
}Output:
File renamed successfully.7. Delete a File
This program deletes an existing file using the delete() method. A confirmation message is displayed after the deletion.
import java.io.File;
public class DeleteFileExample {
public static void main(String[] args) {
File file = new File("StudentDetails.txt");
if (file.delete()) {
System.out.println("File deleted successfully.");
} else {
System.out.println("Unable to delete the file.");
}
}
}Output:
File deleted successfully.