java将String和List等写入到到文件中

import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class ProduceFakeData_t1 {

public static void main(String [] args)
{

byte[] buff=new byte[]{};

try
{
List<String> aa=new ArrayList<>();
aa.add("test1");
aa.add("test2");
buff=aa.toString().getBytes();
FileOutputStream out=new FileOutputStream("C:\\Users\\zyw\\Desktop\\test\\t1.txt", true);
out.write(buff,0,buff.length);
out.close();
}
}

catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}

}
}