无法在java中写入文件

Question

我正在尝试使用java在文件中打印内容，这是代码

//open a file
public void openFileTwo(String file){
    try{
        y = new Scanner(new File(file));
    }catch(Exception e){
        System.out.println("Failed to find the file");
    }
}

//here im trying to get a word and also bigram and store them in an array
public void readArticles(String file,ArrayList<String> storage) throws IOException{
    openFileTwo(file);
    while(y.hasNext()){

        String a = y.next();    
        a = a.replaceAll("[^A-Za-z0-9]", "");   
        a = a.toLowerCase();

        storage.add(a);

    }
    closeFile();
    storage.removeAll(Arrays.asList(null,""));
    int size = storage.size();
    for(int i = 0; i < size; i++){
        if(i != size-1){
            storage.add(storage.get(i)+" "+storage.get(i+1));
        }
    }
    //writeFile(storage, "D:/skripsi/perlengkapan/test.txt");
}

然后，我想运行它

FileWriter f0 = new FileWriter("D:/skripsi/perlengkapan/tfidf.txt");
String newLine = System.getProperty("line.separator");

//i call the readArticles method
f0.write(a +newLine);
readArticles(c,store);

只要我把readArticles方法放在上面就可以运行，任何人都可以帮助我吗？

提前致谢