Question

我正在尝试对某些二进制对象执行按位AND比较：

private int selectedButtons = 0x00;

private static final int ABSENCE_BUTTON_SELECTED = 0x01;
private static final int SICKNESS_BUTTON_SELECTED = 0x02;
private static final int LATENESS_BUTTON_SELECTED = 0x04;

这是比较器：

    boolean absenceButtonEnabled = selectedButtons & ABSENCE_BUTTON_SELECTED;

但是我收到了这个错误：

Error:(167, 56) error: incompatible types
required: boolean
found:    int

有什么想法吗？

Answer 1

selectedButtons & ABSENCE_BUTTON_SELECTED是一个整数，因为&是binary or运算符。

将其转换为布尔值：

boolean absenceButtonEnabled = (selectedButtons & ABSENCE_BUTTON_SELECTED) != 0;

Answer 2

将其与零比较：

boolean absenceButtonEnabled = selectedButtons & ABSENCE_BUTTON_SELECTED != 0;

Answer 3

两个int的返回类型为int。请尝试以下代码。

boolean absenceButtonEnabled = (selectedButtons & ABSENCE_BUTTON_SELECTED) == ABSENCE_BUTTON_SELECTED

在Java中进行位移时不兼容的类型错误

3 个答案: