[英]Java check if Checkbox is checked
I use:我用:
CheckboxGroup cg = new CheckboxGroup();
Checkbox c1 = new Checkbox("A", false, cg);
Checkbox c2 = new Checkbox("B", false, cg);
Checkbox c3 = new Checkbox("C", true, cg);
To create a group of three checkboxes.创建一组三个复选框。 Now, I want to check which one of them is checked.现在,我想检查检查了其中的哪一个。 I use:我用:
if (c1.isSelected()) { }
but this gives The method isSelected() is undefined for the type Checkbox
... Recommended solution is add cast to c1, I do so and it gives Cannot cast from Checkbox to AbstractButton
... Again, how can I just check if a Checkbox if checked?但这给出了The method isSelected() is undefined for the type Checkbox
...推荐的解决方案是将强制转换添加到 c1,我这样做了,它给出了Cannot cast from Checkbox to AbstractButton
......同样,我怎么能只检查一个 Checkbox如果检查?
Use getState()使用 getState()
boolean checked = c1.getState();
if(c1.getState()) {
//c1 is checked
} else if (c2.getState()) {
//
}
OR或者
Checkbox cb = cg.getSelectedCheckbox();
if(null != cb) {
//not checked
} else {
System.out.println(cb.getLabel() + " is checked");
}
您可以使用Checkbox::getState()
或(如评论中所述) CheckboxGroup#getSelectedCheckbox()
1st of all java.awt.Checkbox doesn't have .isSelected() method in its super class, which is java.awt.Component.第一个 java.awt.Checkbox 在其超类中没有 .isSelected() 方法,即 java.awt.Component。
https://docs.oracle.com/javase/7/docs/api/java/awt/Checkbox.html https://docs.oracle.com/javase/7/docs/api/java/awt/Checkbox.html
please check the above link for Methods inherited from class java.awt.Component请检查上面的链接从类 java.awt.Component 继承的方法
2nd .isSelected() method can be used if you use JCheckBox from javax.swing.JComponent;如果您使用 javax.swing.JComponent 中的 JCheckBox,则可以使用第二个 .isSelected() 方法; but not CheckBox of AWT...但不是 AWT 的 CheckBox ......
please go through below link.. and you can find .isSelected() which is inherited from javax.swing.AbstractButton;请通过下面的链接.. 你可以找到从 javax.swing.AbstractButton 继承的 .isSelected();
https://docs.oracle.com/javase/7/docs/api/javax/swing/JCheckBox.html https://docs.oracle.com/javase/7/docs/api/javax/swing/JCheckBox.html
I found the isChecked() method to be the winner.我发现 isChecked() 方法是赢家。
// Check to see if box is checked
if (c1.isChecked()) {
// Your code if the box is checked
} else {
// Your code if the box is not checked
}
judging by your use of isSelected
i concluded you have 1 of 2 mistakes:根据您对isSelected
的使用判断,我得出结论您有 2 个错误中的 1 个:
c1.getState()
and not isSelected()
你想使用复选框,如果是这种情况,那么你应该使用c1.getState()
而不是isSelected()
RadioBox
instead of CheckBox
and then you can use the isSelected()
method.您需要RadioBox
而不是CheckBox
,然后您可以使用isSelected()
方法。 check here about the two 检查这里关于这两个you can try this code你可以试试这个代码
// check is ckeck box id
if (check.isSelected()) {
// your code for checked;
} else {
// our code for not checked;
}
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