Question

我在java while循环中遇到多个条件的问题。我试图将条件设置为不等于null，但android studio表示&&不能应用于布尔值。任何帮助表示赞赏！

我正在尝试这样做：

String question = null, answer = null, answerOne = null,
        answerTwo = null, answerThree = null, answerFour = null;

while (((question = reader.readLine()) != null)
        && ((answer = reader.readLine()) != null)
        && (answerOne = reader.readLine()) !null)
        && ((answerTwo = reader.readLine()) != null)
        && (anwserThree = reader.readLine()) != null)
        && ((anwserFour = reader.readLine()) != null)) {

    //reading some lines from resource file
    Question q = new Question(question, answer, answerOne, answerTwo,
            answerThree, answerFour);
        mQuestions.add(q);
}

Answer 1

你的情况不正常。这包括缺少左括号(，!运算符，!=运算符有意义，缺少右括号)，以及错误拼写“回答”2中的变量条件。

替换

(answerOne = reader.readLine()) !null)

与

((answerOne = reader.readLine()) != null)  // Two ( at beginning; !=

替换

( anwserThree= reader.readLine()) != null)

与

((answerThree = reader.readLine()) != null) // Two ( at beginning; spelling

替换

( (anwserFour= reader.readLine()) != null)

与

((answerFour= reader.readLine()) != null))  // Spelling; Two ) at end

Answer 2

你在这段时间内有一段错字：

(answerOne = reader.readLine()) !null)

应该是：

(answerOne = reader.readLine()) != null)

也许这可以解决你的问题？

while循环java中的多个条件的问题

2 个答案: