如何把ArrayList集合写入txt文件

 import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;

public class ArrayToTxt {
    public static void main(String[] args) throws Exception{
        File f=new File("d:/1.txt");
        ArrayList<String> al=new ArrayList<String>();
        al.add("first");
        al.add("second");
        al.add("third");
        BufferedWriter bw=new BufferedWriter(new FileWriter(f));
        for(int i=0;i<al.size();i++){
            bw.write(al.get(i));
            bw.newLine();
        }
        bw.close();
    }
}