在 Java 中进行位移时出现类型不兼容错误

Question

我正在尝试对某些二进制对象执行按位与比较：

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

将其与零进行比较：

boolean absenceButtonEnabled = selectedButtons & ABSENCE_BUTTON_SELECTED != 0;

Answer 2

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

要将其转换为布尔值，请使用：

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

Answer 3

两个int的return类型是int。试试下面的代码。

boolean absenceButtonEnabled = (selectedButtons & ABSENCE_BUTTON_SELECTED) == ABSENCE_BUTTON_SELECTED

在 Java 中进行位移时出现类型不兼容错误

Incompatible type error when bitshifting in Java

java

binary

bit-shift

comparator