Java output to a file question

[xxdxxd]

I want to output some strings to a file, but the result file has nothing in it, what is wrong with the following code? Thanks.
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import java.io.*;

public class testfile {

public static void main(String[] args) {

try{
File outFile=new File("out.txt");
FileWriter out=new FileWriter(outFile);
BufferedWriter pw=new BufferedWriter(out);
pw.write ("aaaaa");
pw.write("bbbbbb");
pw.write("ccccc");

}catch(IOException e){
System.err.println(e.toString());}

}

}