How to write String in File in Java Programm

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.File;
class FileTest
{
public static void  main(String Dx[])
{
  FileOutputStream fout;
  File file;
 try{
            
             file=new File("abc.txt");
            fout=new FileOutputStream(file);
             String s="Hi, Hello ,how r u?";
                if(!file.exists())
                 {file.createNewFile();}
               byte[]  b=s.getBytes();
                 fout.write(b);
               fout.flush();
               fout.close();
          System.out.println("Operation is successfully Compleated");      
        }
       catch(Exception e)
        {System.out.println(e);}
}


}