A demo file on the desktop named ‘gfg.txt’ is used for reference as a local directory on the machine. Creating an empty file before writing a program and give that specific path of that file to the program.
Methods:
- Using writeString() method of Files class
- Using write() method of Files class
- Using writer() method of Filewriter class
- Using write() method of Bufferedwriter class
- Using write() method of PrintWriter class
Let us discuss every method individually by implementing the same via clean java programs to get a fair idea of working on them.
Method 1: Using writeString() method of Files class
The writeString() method of File Class in Java is used to write contents to the specified file. ‘java.nio.file.Files’ class is having a predefined writeString() method which is used to write all content to a file, using the UTF-8 charset.
Syntax:
Files.writeString(path, string, options)
Parameters:
- Path: File path with data type as Path
- String: A specified string that will enter in the file with a return type string.
- Options: Different options to enter the string in the file. Like append the string to the file, overwrite everything in the file with the current string, etc
Return Value: This method does not return any value.
Procedure:
- Create an instance of the file.
- Call the Files.writeString() method with an instance, string and characters set.
Example
Java
// Java Program to Save a String to a File// Using Files.writeString() method// Importing required classesimport java.io.*;import java.io.IOException;import java.nio.charset.StandardCharsets;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;// Main classpublic class GFG { // Main driver method public static void main(String[] args) { // Creating an instance of file Path path = Paths.get("C:\\Users\\HP\\Desktop\\gfg.txt"); // Custom string as an input String str = "Geeks for Geeks \nWelcome to computer science portal \nHello Geek"; // Try block to check for exceptions try { // Now calling Files.writeString() method // with path , content & standard charsets Files.writeString(path, str, StandardCharsets.UTF_8); } // Catch block to handle the exception catch (IOException ex) { // Print messqage exception occurred as // invalid. directory local path is passed System.out.print("Invalid Path"); } }} |
Output:
Geeks for Geeks Welcome to computer science portal Hello Geek
Method 2: Using write() method of Files class
java.nio.file.Files class is having a predefined write() method which is used to write a specified text to the file.
Procedure:
- Create an instance of the file.
- Convert the string into a byte array by using string.getBytes() method.
- Lastly call method namely Files.write() with file instance and the byte array.
Example
Java
// Java Program to Save a String to a File// Using Files.write() method// Importing required classesimport java.io.*;import java.io.IOException;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;// Main classpublic class GFG { // Main driver method public static void main(String[] args) { // Creating an instance of file Path path = Paths.get("C:\\Users\\HP\\Desktop\\gfg.txt"); // Custom string as an input String str = "Geeks for Geeks \nWelcome to computer science portal \nHello Geek!"; // Converting string to byte array // using getBytes() method byte[] arr = str.getBytes(); // Try block to check for exceptions try { // Now calling Files.write() method using path // and byte array Files.write(path, arr); } // Catch block to handle the exceptions catch (IOException ex) { // Print message as exception occurred when // invalid path of local machine is passed System.out.print("Invalid Path"); } }} |
Output:
Geeks for Geeks Welcome to computer science portal Hello Geek!
Method 3: Using writer() method of FileWriter class
Filewriter class is used to write some data on file. This is a simple way of writing the data on file.
Procedure:
- Create an instance of the file.
- Passing the file instance into filewriter.
- Now call writer() method over a filewriter with string data.
- Flush the file resource.
- Close the file resource.
Example
Java
// Java Program to Save a String to a File// Using FileWriter class// Importing required classesimport java.io.*;import java.io.File;import java.io.FileWriter;import java.io.IOException;public class GFG{ public static void main(String[] args) throws IOException { //creating the instance of file File path = new File("C:\\Users\\HP\\Desktop\\gfg.txt"); //passing file instance in filewriter FileWriter wr = new FileWriter(path); //calling writer.write() method with the string wr.write("Geeks for Geeks \nWelcome to computer science portal \nHello Geek!!"); //flushing the writer wr.flush(); //closing the writer wr.close(); }} |
Output:
Geeks for Geeks Welcome to computer science portal Hello Geek!!
Method 4: Using write() method of BufferedWriter class
BufferedWriter class basically provides a buffer for writing instance. We can wrap some other writers like PrintWriter and FileWriter into BufferedWriter. BufferedWriter is very efficient for doing multiple write operations on file & writing multiple files. BufferedWriter is very efficient than Filewriter.
Procedure:
- Create an instance of the file.
- Declare the stream with filewriter.
- Call write() method on stream with string data.
Example
Java
// Java Program to Save a String to a File// Using Files.write() method// Importing required classesimport java.io.*;import java.io.IOException;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;// Main classpublic class GFG { // Main driver method public static void main(String[] args) { // Creating an instance of file Path path = Paths.get("C:\\Users\\HP\\Desktop\\gfg.txt"); // Custom string as an input String str = "Geeks for Geeks \nWelcome to computer science portal \nHello Geek!"; // Converting string to byte array // using getBytes() method byte[] arr = str.getBytes(); // Try block to check for exceptions try { // Now calling Files.write() method using path // and byte array Files.write(path, arr); } // Catch block to handle the exceptions catch (IOException ex) { // Print message as exception occurred when // invalid path of local machine is passed System.out.print("Invalid Path"); } }} |
Output:
Geeks for Geeks Welcome to computer science portal Hello Geek!!!
Method 5: Using write() method of PrintWriter class
PrintWriter class is an extension of writer class. PrintWriter class is used to write the string data on file using the write() method.
Procedure:
- Create an instance of the file.
- Create a stream of PrintWriter and pass the file instance into it.
- Call the write method with data.
- Flush the stream.
- Close the stream.
Example
Java
// Java Program to Save a String to a File// Using PrintWriter class// Importing required classesimport java.io.*;import java.io.File;import java.io.FileNotFoundException;import java.io.PrintWriter;// Main classpublic class GFG { // Main driver method public static void main(String[] args) throws FileNotFoundException { // Creating an instance of file File path = new File("C:\\Users\\HP\\Desktop\\gfg.txt"); // Declaring the print writer with path PrintWriter pw = new PrintWriter(path); // Now calling writer() method with string pw.write( "Geeks for Geeks \nWelcome to computer science portal \nHello Geek!!!!"); // Flushing the print writer pw.flush(); // Lastly closing the printwriter // using the close() method pw.close(); }} |
Output:
Geeks for Geeks Welcome to computer science portal Hello Geek!!!!
