login.java

学习java编程的好程序

import javax.swing.JPanel;
import java.awt.*;
import javax.swing.*;
public class login extends JPanel
{
  static final int WIDTH=300;
  static final int HEIGHT=150;

    public void add(Component c,GridBagConstraints constraints,int x,int y,int w,int h)
    {
      constraints.gridx=x;
      constraints.gridy=y;
      constraints.gridwidth=w;
      constraints.gridheight=h;
      add(c,constraints);
    }

    public static void main(String[] args)
    {
    JFrame loginframe=new JFrame("信息管理系统");
    loginframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    login l=new login();
    GridBagLayout lay=new GridBagLayout();
    l.setLayout(lay);
    loginframe.add(l, BorderLayout.WEST);
    loginframe.setSize(WIDTH,HEIGHT);
    Toolkit kit=Toolkit.getDefaultToolkit();
    Dimension screenSize=kit.getScreenSize();
    int width=screenSize.width;
    int height=screenSize.height;
    int x=(width-WIDTH)/2;
    int y=(height-HEIGHT)/2;
    loginframe.setLocation(x,y);
    JButton ok=new JButton("登陆");
    JButton cancel=new JButton("放弃");
    JLabel title=new JLabel("信 息 系 统 登 陆 窗 口");
    JLabel name=new JLabel("用户名");
    JLabel password=new JLabel("密 码");
    JTextField nameinput=new JTextField(15);
    JPasswordField passwordinput=new JPasswordField(15);
    GridBagConstraints constraints=new GridBagConstraints();
    constraints.fill=GridBagConstraints.NONE;
    constraints.anchor=GridBagConstraints.EAST;
    constraints.weightx=3;
    constraints.weighty=4;
    l.add(title,constraints,0,0,4,1);
    l.add(name,constraints,0,1,1,1);
    l.add(password,constraints,0,2,1,1);
    l.add(nameinput,constraints,2,1,1,1);
    l.add(passwordinput,constraints,2,2,1,1);
    l.add(ok,constraints,0,3,1,1);
    l.add(cancel,constraints,2,3,1,1);
    loginframe.setResizable(false);
    loginframe.show();  
  }
}