Java錯誤消息“ ...在...中具有私有訪問權”

Question

用Java編寫代碼時遇到了一種情況。 該錯誤提到在我的代碼中newLine() has private access in PrintWriter我從未收到此錯誤，這讓我感到擔憂，因為我不明白為什么newLine將對變量PrintWriter private

以下將是我的錯誤消息以及此問題來自的部分代碼。

錯誤：

:75: error: newLine() has private access in PrintWriter
                        savingsFile.newLine();
                                   ^
:77: error: newLine() has private access in PrintWriter
                        savingsFile.newLine();
                                   ^
:96: error: cannot find symbol
        while((str1=savingsFile.readLine())!=null){
                               ^
  symbol:   method readLine()
  location: variable savingsFile of type Scanner
3 errors

碼：

    public static void writeToFile(String[] months, double[] savings) throws IOException{
    PrintWriter savingsFile = null;
    try {
        savingsFile = new PrintWriter(new FileWriter("E:/savings.txt", true));
    } catch (IOException e) {
        e.printStackTrace();
    }

    //code to write to the file and close it
    int ctr = 0;
    while(ctr<6){
            savingsFile.write(months[ctr]);
            savingsFile.newLine();
            savingsFile.write(savings[ctr]+"");
            savingsFile.newLine();
            ctr = ctr + 1;;
        }
        savingsFile.close();
    }

   public static void readFromFile(String[] months, double[] savings) throws IOException{
    String str1, str2;
    Scanner savingsFile = null;
    try {
        savingsFile = new Scanner(new File("E:/savings.txt"));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    //code to read the file, load data in the array and close file
        str1 = savingsFile.nextLine();
        System.out.println(str1);
        int ctr = 0;
        while((str1=savingsFile.readLine())!=null){
            System.out.println(str1);
        }
        savingsFile.close();
    }

Answer 1

PrintWriter沒有公共的newLine（）方法（ 請參見Javadoc ）。 只需編寫換行符"\\n"以換行，或調用不帶參數的println() 。

掃描儀沒有readLine()方法。 您可能是指nextLine()

Answer 2

似乎newLine()是PrintWriter中的私有方法，這意味着您不能從將PrintWriter實例化為對象的其他類中進行外部調用。