我的单选按钮的 isSelected 方法不起作用，即使我在运行程序时选择它们，我是 java gui 编码的新手，所以请据此解释，我正在发布整个 gui 的类代码。我正在使用 eclipse秋千设计师
public class gui {
private JFrame frame;
private final ButtonGroup buttonGroup = new ButtonGroup();
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
gui window = new gui();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
* @throws FileNotFoundException
*/
public gui() throws FileNotFoundException {
initialize();
}
/**
* Initialize the contents of the frame.
* @throws FileNotFoundException
*/
private void initialize() throws FileNotFoundException {
FileReader reader=new FileReader("C:\\Users\\kkj\\workspace\\javaproject\\src\\Database.txt");
Scanner in=new Scanner(reader);
BList Restaurant=new BList();
BList ATM=new BList();
BList Hospital=new BList();
BList Hotels=new BList();
BList Petrol=new BList();
final Llist locations=new Llist();
System.out.println("Loading");
while(in.hasNextLine())
{
BNode bnode=new BNode();
bnode.name=in.nextLine();
//System.out.println(bnode.name);
String type=in.nextLine();
bnode.loc=in.nextLine();
if(type.equals("Restaurant"))
{
Restaurant.insert(bnode);
}
if(type.equals("ATM"))
{
ATM.insert(bnode);
}
if(type.equals("Hospital"))
{
Hospital.insert(bnode);
}
if(type.equals("Hotels"))
{
Hotels.insert(bnode);
}
if(type.equals("Petrol"))
{
Petrol.insert(bnode);
}
}
FileReader reader2=new FileReader("C:\\Users\\kkj\\workspace\\javaproject\\src\\locations.txt");
Scanner inL=new Scanner(reader2);
int s=0;
while(inL.hasNextLine())
{
LNode loc=new LNode();
loc.Name=inL.nextLine();
loc.dist=s++;
BNode temp;
temp=Restaurant.head;
while(temp.next!=null)
{ if(temp.loc.equals(loc.Name))
{loc.rest=temp;break;}
temp=temp.next;
}
temp=Hospital.head;
while(temp.next!=null)
{ if(temp.loc.equals(loc.Name))
{loc.Hospital=temp;break;}
temp=temp.next;
}
temp=Hotels.head;
while(temp.next!=null)
{ if(temp.loc.equals(loc.Name))
{loc.Hotels=temp;break;}
temp=temp.next;
}
//loc.hotels=temp;
temp=ATM.head;
while(temp.next!=null)
{ if(temp.loc.equals(loc.Name))
{loc.ATM=temp;break;}
temp=temp.next;
}
locations.insert(loc);
}
System.out.println("Loaded");
System.out.println(">>>>>>>>>>>Restaurants<<<<<<<<<<<<");
Restaurant.disp();
System.out.println(">>>>>>>>>>>Hotels<<<<<<<<<<<<");
Hotels.disp();
System.out.println(">>>>>>>>>>>Hospital<<<<<<<<<<<<");
Hospital.disp();
System.out.println(">>>>>>>>>>>ATM's<<<<<<<<<<<<");
ATM.disp();
System.out.println(">>>>>>>>>>>Locations<<<<<<<<<<<<");
locations.disp();
final String curr="Bsk";
String locin;
final String typein="Hospital";
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JRadioButton rdbtnBsk = new JRadioButton("Bsk");
buttonGroup.add(rdbtnBsk);
rdbtnBsk.setBounds(26, 35, 109, 23);
frame.getContentPane().add(rdbtnBsk);
JRadioButton rdbtnKoramangala = new JRadioButton("Koramangala");
buttonGroup.add(rdbtnKoramangala);
rdbtnKoramangala.setBounds(26, 72, 109, 23);
frame.getContentPane().add(rdbtnKoramangala);
JRadioButton rdbtnMgRoad = new JRadioButton("MG Road");
buttonGroup.add(rdbtnMgRoad);
rdbtnMgRoad.setBounds(26, 125, 109, 23);
frame.getContentPane().add(rdbtnMgRoad);
if(rdbtnBsk.isSelected())
{
locin="Bsk";
}
if(rdbtnKoramangala.isSelected())
{
locin="Koramangala";
}
if(rdbtnMgRoad.isSelected())
{
locin="MG Road";
}
else System.exit(2);
final String locinn=locin;
JButton btnOutput = new JButton("output");
btnOutput.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
Output out1=new Output();
System.out.println(">>>>>>>>>>>"+typein+" in "+locinn+"<<<<<<<<<<<<");
out1.display(locations, locinn, typein,curr);
}
});
btnOutput.setBounds(182, 193, 89, 23);
frame.getContentPane().add(btnOutput);
}
private class SwingAction extends AbstractAction {
public SwingAction() {
putValue(NAME, "SwingAction");
putValue(SHORT_DESCRIPTION, "Some short description");
}
public void actionPerformed(ActionEvent e) {
}
}
}