Question

我正在尝试从调用方法获取返回值savedName。我需要在另一个方法中使用字符串保存名称中的值

    if (n == 0){
        String fullName = readFromFile(); //wont let me do this
        text.setText("Welcome " + fullName + ".");
    }


private String readFromFile(String savedName){
    savedName="";
    try {
    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(f)));
    savedName = br.readLine();
    System.out.println(savedName);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return savedName;

}

Answer 1

您尝试调用的方法必须具有匹配的方法签名。在这种情况下，数字和类型参数必须相同。最直接的方法是从方法中删除String参数，并在方法中创建一个名为savedName的String变量并将其返回，如下所示：

private String readFromFile(){
    String savedName="";
    try {
    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(f)));
    savedName = br.readLine();
    System.out.println(savedName);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return savedName;

}

Answer 2

我在String fullName = readFromFile("pass some String here"); //wont let me do this

中做了新的更改

 if (n == 0){
        String fullName = readFromFile("pass some String here"); //now this will let you do
        text.setText("Welcome " + fullName + ".");
    }


private String readFromFile(String savedName){
    savedName="";
    try {
    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(f)));
    savedName = br.readLine();
    System.out.println(savedName);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return savedName;

}

如何用参数调用方法？

2 个答案: