How to truncate a file in Java?

The flush() method of the FileWriter class flushes the contents of the file. You can use this method to truncate a file.

Example

import java.io.File;
import java.io.FileWriter;

public class FileTruncate {
   public static void main(String args[]) throws Exception {
      File file = new File("myData");
      FileWriter fw = new FileWriter(file, false);
      fw.flush();
      System.out.println("File truncated");
   }
}

Output

File truncated