Problems with multiple conditions in while loop java

Question

I have problems with multiple conditions in a java while loop. I am trying to put conditions as not equal as null, but android studio says that && cannot be applied to boolean. Any help is appreciated!

I am trying to do this:

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);
}

are you missing an = before your third null?

tim
– tim

2015-05-15 20:08:58 +00:00
Commented May 15, 2015 at 20:08 — tim
– tim, Commented May 15, 2015 at 20:08
Learn to properly format your code first...

Axel
– Axel

2015-05-15 20:10:00 +00:00
Commented May 15, 2015 at 20:10 — Axel
– Axel, Commented May 15, 2015 at 20:10

rgettman · Accepted Answer · 2015-05-15 20:12:19Z

3

You have malformed conditions. This includes a missing opening parenthesis (, a ! operator where a != operator makes sense, a missing closing parenthesis ), and misspelling "answer" on 2 variables in the conditions.

Replace

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

with

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

Replace

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

with

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

Replace

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

with

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

answered May 15, 2015 at 20:12

rgettman

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Comments

CubeJockey · Accepted Answer · 2015-05-15 20:27:21Z

2

You have got a typo in a part of the while-condition:

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

should be:

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

Maybe that solves your issue?

edited May 15, 2015 at 20:27

CubeJockey

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answered May 15, 2015 at 20:11

Speni

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