FileWriter打開檔案固定套路

import java.io.*;
public class FileDemo {
    public static void main(String[] args) throws IOException {
        FileWriter fw = null;
        try {
            fw = new FileWriter("k:/demo.txt");
            fw.write("abcde");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fw != null) {
                    fw.close();
                    System.out.println("執行成功！");
                }
            } catch (IOException e2) {
                e2.printStackTrace();
            }
        }       
    }
}