import java.awt
import javax.swing.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
public class test {
	public static void main(String[] args) {
		// TODO 自动生成的方法存根
           frame fr=new frame("学生信息管理系统-登录");
           //frame.add(C1);
	}
}
	class frame extends JFrame{
		
		JButton J1=new JButton ("登陆");//按钮
		JButton J2=new JButton ("退出");
		JLabel l1=new JLabel("用户账号");//标签
		JLabel l2=new JLabel("用户密码");
		JLabel l3=new JLabel("用户身份:");
		JTextField T1=new JTextField(10);//框框大小
		JTextField T2=new JTextField(10);
		String []user={"管理员","学生","老师","教导主任","院领导"};
		JComboBox C1=new JComboBox(user);//叠加框
		
		class comboBox extends JPanel{
			comboBox(){
				C1.setEditable(true);
				setLayout(new GridLayout(5,0));
				add(C1);
			}
		}	
		frame(String str){
			super(str);
			setSize(400,400);
			FlowLayout flow=new FlowLayout(FlowLayout.CENTER,20,20);
			this.setLayout(flow);
			add(l1);add(T1);add(l2);add(T2);add(l3);add(C1);add(J1);add(J2);
			this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			setVisible(true);
		}
	}