mCurrentIndex =(mCurrentIndex + 1)%mQuestionBank.length;

Question

我不懂语法:

mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;

(mQuestionBank是一个数组).

是什么原因% mQuestionBank.length？

Answer 1

它在逻辑上等同于

if (mCurrentIndex + 1 < mQuestionBank.length) {
    mCurrentIndex++;
} else {
    mCurrentIndex = 0;
}

并用于通过数组旋转索引而不超出其边界.