Java - JRadioButton isSelected

Question

我有这样简单的支票：

boolean isPressed;


 if ((jRadioButton1.isSelected() == false) || (jRadioButton2.isSelected() == false) || (jRadioButton3.isSelected() == false)) {
        isPressed = false;
    } else {
        isPressed = true;
    }
    System.out.println(isPressed);

为什么我总是出错，即使我在面板中标记了RadioButton？

Answer 1

您的逻辑意味着，如果没有按单选按钮，那么isPressed就是假的。

试着转换逻辑

if ((jRadioButton1.isSelected() == true) || (jRadioButton2.isSelected() == true) || (jRadioButton3.isSelected() == true)) {
    isPressed = true;
} else {
    isPressed = false;
}
System.out.println(isPressed);

编辑:可以简化为

isPressed = (jRadioButton1.isSelected() || jRadioButton2.isSelected() || jRadioButton3.isSelected()) 

Answer 2

您必须在if子句中使用and (&&)而不是或(\)。

if ((jRadioButton1.isSelected() == false) &&
      (jRadioButton2.isSelected() == false) && 
      (jRadioButton3.isSelected() == false)) {
        isPressed = false;
    } else {
        isPressed = true;
    }
    System.out.println(isPressed);