Java 11 Files.writeString(): Writing Text to a File

Learn to write a string into a file in Java using Files.writeString() method. This API has been introduced in Java 11.

1. Files writeString() Method

The java.nio.file.Files class has two overloaded static methods to write content to file.

public static Path writeString​(Path path, CharSequence csq, OpenOption... options) throws IOException

public static Path writeString​(Path path, CharSequence csq, Charset cs, OpenOption... options) throws IOException
  • The first method writes all content to a file, using the UTF-8 charset.
  • The first method is equivalent to writeString(path, string, StandardCharsets.UTF_8, options).
  • The second method does the same but only using the specified charset.
  • The options specifies how the file is opened.

2. Files writeString() Example

Java program to write String into a file using Files.writeString() method.

import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;
import java.io.IOException;
import java.nio.file.StandardOpenOption;
 
public class Main {
  public static void main(String[] args) {

    Path filePath = Paths.get("C:/", "temp", "test.txt");
 
    try {
      //Write content to file
      Files.writeString(filePath, "Hello World !!", StandardOpenOption.APPEND);
 
      //Optionally verify the file content
      String content = Files.readString(filePath);
 
      System.out.println(content);
    } 
    catch (IOException e) {
      e.printStackTrace();
    }
  }
}

Program output.

Hello World !!

Where the file c:/temp/test.txt is empty initially.

Drop me your questions in the comments section.

Happy Learning !!

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