把ArrayList集合中的字符串数据存储到文件中

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class ArrayListToFile {

    public static void main(String[] args) throws Exception {
        String a="我是dasda54154asd";
        ArrayList list=new ArrayList<>();
        list.add(a);
        FileWriter fw=new FileWriter(new File("a3.txt"));
        int n=0;
        for (String string : list) {
            fw.write(string);
            fw.flush();
        }
        System.out.println("复制完毕!");
        fw.close();

    }

}