Java中的位移位时出现不兼容的类型错误

Question

I'm trying to do a bitwise AND comparator on some binary objects:

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;

Here is the comparator:

    boolean absenceButtonEnabled = selectedButtons & ABSENCE_BUTTON_SELECTED;

But I'm getting this error:

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

Any ideas?

Answer 1

selectedButtons & ABSENCE_BUTTON_SELECTED is an integer, because & is the binary or operator.

To convert it to boolean use:

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

Answer 2

比较它为零：

boolean absenceButtonEnabled = selectedButtons & ABSENCE_BUTTON_SELECTED != 0;

Answer 3

The return type of two int s is int . Try the following code.

boolean absenceButtonEnabled = (selectedButtons & ABSENCE_BUTTON_SELECTED) == ABSENCE_BUTTON_SELECTED