import javax.swing.*
public class Chess extends JPanel
{// 继承面板类
public Chess(int grids,int gridsize)
{//grids:行数和列数, gridsize:单元格的高和宽
super(null)
for(int i=0i<gridsi++)
{
for(int j=0j<gridsj++)
{
JLabel l = new JLabel()//生成标签实例
l.setSize(gridsize,gridsize)
l.setLocation(i*gridsize,j*gridsize)
if((i+j)%2==0)
{ //当小方格的坐标和刚好是偶数时，
l.setBackground(Color.black) //设置为方格为黑色
l.setOpaque(true) //设置为不透明
}
l.setBorder(BorderFactory.createLineBorder(Color.black)) //设置边界为黑色
add(l)//将l标签添加到面板
}
}
}
public static void main(String[] args)
{
JFrame f = new JFrame()
f.setSize(658,677) //边框的长和宽
f.setLocationRelativeTo(null) //设置窗口相对于指定组件的位置
f.add(new Chess(8,80))
f.setVisible(true)
}
}
你可参考：http://zhidao.baidu.com/question/127345147.html?qbl=relate_question_0&word=java%CF%F3%C6%E5%B5%C7%C2%BC%BD%E7%C3%E6%B5%C4%B4%FA%C2%EB还有这个
package java1
import java.awt.*
import java.awt.event.*
import java.sql.*
import java.util.*
import javax.swing.*
import javax.swing.event.*
import java.awt.Rectangle
import java.awt.Font
public class login extends JFrame
{
public login() {
try {
jbInit()
}
catch (Exception ex) {
ex.printStackTrace()
}
}
public static void main(String[] args)
{
login frm=new login()
frm.setBounds(300,200,300,260)
frm.setVisible(true)
}
private void jbInit() throws Exception {
this.getContentPane().setLayout(null)
jLabel1.setForeground(Color.red)
jLabel1.setText("用户名")
jLabel1.setBounds(new Rectangle(25, 72, 68, 29))
jButton2.setBounds(new Rectangle(142, 159, 81, 30))
jButton2.setText("取消")
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton2_actionPerformed(e)
}
})
jButton1.setBounds(new Rectangle(38, 159, 81, 29))
jButton1.setText("确定")
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton1_actionPerformed(e)
}
})
jTextField1.setBounds(new Rectangle(109, 79, 136, 23))
jPasswordField1.setBounds(new Rectangle(109, 115, 136, 23))
this.getContentPane().add(jLabel1)
jLabel3.setFont(new java.awt.Font("隶书", Font.PLAIN, 24))
jLabel3.setText("学 生 考 试 系 统")
jLabel3.setBounds(new Rectangle(22, 15, 268, 47))
this.getContentPane().add(jTextField1)
this.getContentPane().add(jLabel2)
this.getContentPane().add(jButton2)
this.getContentPane().add(jButton1)
this.getContentPane().add(jLabel3)
this.getContentPane().add(jPasswordField1)
jLabel2.setForeground(Color.red)
jLabel2.setText("密码")
jLabel2.setBounds(new Rectangle(26, 112, 68, 29))
}
JLabel jLabel1 = new JLabel()
JLabel jLabel2 = new JLabel()
JTextField jTextField1 = new JTextField()
JButton jButton1 = new JButton()
JButton jButton2 = new JButton()
JLabel jLabel3 = new JLabel()
JPasswordField jPasswordField1 = new JPasswordField()
main2 wo=new main2()
int sum
//判断权限的方法
public void success()
{
try{
ResultSet rs1
String s1="select * from 管理权限 where name='"+jTextField1.getText()+"' and password='"+jPasswordField1.getText()+"'"
rs1=sqlcx.Rs_jiluji(s1)
rs1.first()
sum=Integer.parseInt((String)(rs1.getString(3)))
System.out.println(sum)
very()
}
catch(Exception c)
}
//根据权限设置窗口
public void very()
{
if (sum==1)
{JOptionPane.showOptionDialog(this, "您现在是以教师权限登陆", "登陆信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
}
else
{
JOptionPane.showOptionDialog(this, "你现在是以学生权限登陆", "登陆信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
wo.jButton2.setVisible(false)
wo.jButton3.setVisible(false)
wo.jButton4.setVisible(false)
wo.jButton5.setVisible(false)
wo.jButton6.setVisible(false)
wo.jButton7.setVisible(false)
wo.jButton8.setVisible(false)
wo.jMenu2.setVisible(false)
wo.jMenu3.setVisible(false)
wo.jMenu4.setVisible(false)
}
}
public void jButton1_actionPerformed(ActionEvent e)
{
//判断用户名是否为空
if (jTextField1.getText().length() == 0) {
JOptionPane.showOptionDialog(this, "用户名不能为空", "错误信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
}
//判断密码是否为空
else if (jPasswordField1.getText().length()==0)
{
JOptionPane.showOptionDialog(this,"密码不能为空", "错误信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
}
else
{
try
{
ResultSet rs//声明记录集
String sql="select * from 管理权限 where name='"+jTextField1.getText()+"'"
rs = sqlcx.Rs_jiluji(sql)
if (rs.next())
{
if(jPasswordField1.getText().equals(rs.getString(2)))
{
success()
wo.setBounds(60,40,700,600)
wo.setVisible(true)
this.dispose()
}
else
{
JOptionPane.showOptionDialog(this,"密码错误", "错误信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
}
}
else
{
JOptionPane.showOptionDialog(this,"没有所要找的用户名", "错误信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
}
}
catch(Exception c){
JOptionPane.showOptionDialog(this,"连接数据库失败", "错误信息"
, JOptionPane.DEFAULT_OPTION,
JOptionPane.ERROR_MESSAGE,
null, null, null)
}
}
}
public void jButton2_actionPerformed(ActionEvent e) {
System.exit(0)
}
}
