public class ceshi2 implements ActionListener {
JFrame jf = new JFrame("Example");
JPanel panel = new JPanel();
JRadioButton rb1 = new JRadioButton("用户");
JRadioButton rb2 = new JRadioButton("管理员");
Button btok= new Button("登陆");
ButtonGroup group = new ButtonGroup ();
JTextField text = new JTextField(10);
JTextField text2= new JTextField(10);
JTextField text3= new JTextField(10);
ceshi2(){ rb1.setBounds(10, 10, 50, 25);
rb2.setBounds(10, 30, 50, 25);
text.setBounds(10, 70, 100, 30);
text2.setBounds(10, 110, 100, 30);
text3.setBounds(10, 150, 100, 30);
btok.setBounds(10, 190, 100, 30);
panel.setLocation(0, 0);
panel.setSize(200, 200);
jf.add(panel);
group.add(rb1);
group.add(rb2);
panel.add(rb1);
panel.add(rb2);
panel.add(text);
panel.add(text2);
panel.add(text3);
panel.add(btok);
rb1.addActionListener(this);
rb2.addActionListener(this);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(500,500);
jf.setLayout(null);
panel.setLayout(null);
jf.setVisible(true);
jf.setResizable(false);
text.setVisible(false);
btok.addActionListener(new ActionListener() {
//@Overridepublic void actionPerformed(ActionEvent arg0) {
String name=text2.getText();
String password=text3.getText();
String compefence=text.getText();
if (new Login().verify(name,password,compefence)) {
yonghu.getWindows();
new yonghu();
}
else { JOptionPane jop=new JOptionPane();
jop.showMessageDialog(null,"用户名或密码错误","信息提示!",-1);}}});
}
public static void main(String[] args) {
ceshi2 t = new ceshi2();
} @Override
public void actionPerformed(ActionEvent e) {
if(group.getSelection()==rb1.getModel()){
text.setText("0");
}
if(group.getSelection()==rb2.getModel()){ text.setText("1"); } }}

不会 帮顶

你的背景是否是需要更换的,如果是固定的背景可以用这个

610,94是我的背景的尺寸.
如果是需要更换的背景可以在JLabel上加载， 然后再JLabel上添加组件