CSelect

kch.equals(\"\")

是

否

开始

public CSelect() {}

JLabel ltitle = new JLabel(\"课程号：\");JTextField tcno = new JTextField(8);JButton btnOK = new JButton(\"确定\");JPanel p = new JPanel();String kch = null;

public class CSelect extends JFrame implements ActionListener {}

kch = tcno.getText();

结束

public void actionPerformed(ActionEvent e) {}