eliminare file txt java

[satizzu]

Ciao.......gentilmente mi potreste dire il modo per svuotare,non eliminare, un file di testo txt?il file l'ho creato con il seguente codice

import java.io.PrintWriter;
import java.io.PrintStream;
import java.io.OutputStreamWriter;
import java.io.InputStreamReader;
import java.io.FileOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintStream;
import java.io.*;
import java.util.*;


public class esempio1 {
public static void main(String[] args) throws IOException{

FileWriter fw = new FileWriter("c:/scrittura.txt");
PrintWriter out = new PrintWriter(fw);
out.println("<root>");
try{
BufferedReader i = new BufferedReader(new InputStreamReader(new FileInputStream("c:/test.txt"),"UTF-16"));
String str = i.readLine();

while(str!=null){
out.println(str);
str=i.readLine();}

}

catch(UnsupportedEncodingException ue){

System.out.println("Not supported : ");

}

out.println ("</root>");

out.close();

}

}

ho provato ad inserire file.delete() ma non và.Grazie
Daniele