Java Swing - 如何在按鈕組中獲取Selected JRadioButton
我們想知道如何在按鈕組中獲取Selected JRadioButton。
import java.awt.FlowLayout;
import java.util.Enumeration;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
public class Main {
public static void main(String[] args) {
JRadioButton button1 = new JRadioButton("Red");
JRadioButton button2 = new JRadioButton("Green");
JRadioButton button3 = new JRadioButton("Blue");
ButtonGroup colorButtonGroup = new ButtonGroup();
colorButtonGroup.add(button1);
colorButtonGroup.add(button2);
colorButtonGroup.add(button3);
button1.setSelected(true);
JFrame frame = new JFrame();
frame.setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JLabel("Color:"));
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.pack();
frame.setVisible(true);
System.out.println(getSelection(colorButtonGroup));
}
public static JRadioButton getSelection(ButtonGroup group) {
for (Enumeration e = group.getElements(); e.hasMoreElements();) {
JRadioButton b = (JRadioButton) e.nextElement();
if (b.getModel() == group.getSelection()) {
return b;
}
}
return null;
}
}
【jradiobutton】
