如何用java技术实现幸运抽奖活动系统

import java.util.Scanner;

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public class LuckyNumber {

/**

* 幸运抽奖

*/

public static

void main(String[] args) {

String answer

= "y"; // 标识是否继续

String

userName = ""; // 用户名

String

password = ""; // 密码

int cardNumber

= 0; // 卡号

boolean

isRegister = false; // 标识是否注册

boolean

isLogin = false; // 标识是否登录

int max =

9999;

int min =

1000;

Scanner input

= new Scanner(System.in);

do {

System.out.println("*****欢迎进入奖客富翁系统*****");

System.out.println("\t1.注册");

System.out.println("\t2.登录");

System.out.println("\t3.抽奖");

System.out.println("***************************");

System.out.print("请选择菜单：");

int choice =

input.nextInt();

switch

(choice) {

case 1:

System.out.println("[奖客富翁系统

注册]");

System.out.println("请填写个人注册信息：");

System.out.print("用户名：");

userName =

input.next();

System.out.print("密码：");

password =

input.next();

//

获取4位随机数作为卡号

cardNumber =

(int)(Math.random()*(max-min))+min;

System.out.println("\n注册成功，请记好您的会员卡号");

System.out.println("用户名\t密码\t会员卡号");

System.out.println(userName

+ "\t" + password + "\t" + cardNumber);

isRegister =

true; // 注册成功，标志位设置为true

break;

case 2:

System.out.println("[奖客富翁系统

登录]");

if

(isRegister) { // 判断是否注册

//

3次输入机会

for (int i

= 1; i = 3; i++) {

System.out.print("请输入用户名：");

String

inputName = input.next();

System.out.print("请输入密码：");

String

inputPassword = input.next();

if

(userName.equals(inputName) password.equals(inputPassword)) {

System.out.println("\n欢迎您："

+ userName);

isLogin =

true; // 登录成功，标志位设置为true

break;

} else if

(i 3) {

System.out.println("用户名或密码错误，还有"

+ (3 - i) + "次机会！");

} else

{

System.out.println("您3次均输入错误！");

}

}

} else

{

System.out.println("请先注册，再登录！");

}

break;

case 3:

System.out.println("[奖客富翁系统

抽奖]");

if

(!isLogin) { // 判断是否登录

System.out.println("请先登录，再抽奖！");

} else

{

//生成5个4位随机数字，并保存在数组中

int[]

luckynums = new int[5];

for(int i

= 0; i luckynums.length; i++){

luckynums[i] =

(int)(Math.random()*(max-min))+min;

}

System.out.print("请输入您的卡号：");

int

yourcard = input.nextInt();

int

i;

System.out.print("\n本日的幸运数字为：");

for (i = 0;

i luckynums.length; i++) {

System.out.print(luckynums[i]

+ " ");\

}

for (i = 0;

i luckynums.length; i++) {

if

(luckynums[i] == yourcard) {

System.out.println("\n恭喜！您是本日的幸运会员！");

break;

}

}

if (i ==

luckynums.length) {

System.out.println("\n抱歉！您不是本日的幸运会员！");

}

}

break;

default:

System.out.println("[您的输入有误！]");

break;

}

System.out.print("继续吗？（y/n）:");

answer =

input.next();

System.out.println("");

} while

("y".equals(answer));

if

("n".equals(answer)) {

System.out.println("系统退出，谢谢使用！");

}

}

}

急求java学生信息管理系统源代码，带有连接数据库的，万分感谢

import java.awt.BorderLayout;

import java.awt.CardLayout;

import java.awt.Container;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.Icon;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JToolBar;

import javax.swing.SwingConstants;

public class MainFrame extends JFrame implements ActionListener{

InsertPanel ip = null;

SelectPanel sp = null;

JPanel pframe;

JButton jb1,jb2,jb3;

JMenuItem jm11,jm21,jm22,jm23,jm31,jm32,jm41,jm42;

CardLayout clayout;

public MainFrame(String s){

super(s);

JMenuBar mb = new JMenuBar();

this.setJMenuBar(mb);

JMenu m1 = new JMenu("系统");

JMenu m2 = new JMenu("基本信息");

JMenu m3 = new JMenu("成绩");

JMenu m4 = new JMenu("奖惩");

mb.add(m1);

mb.add(m2);

mb.add(m3);

mb.add(m4);

jm11 = new JMenuItem("退出系统");

jm21 = new JMenuItem("输入");

jm22 = new JMenuItem("查询");

jm23 = new JMenuItem("更改");

jm31 = new JMenuItem("输入成绩");

jm32 = new JMenuItem("查询成绩");

jm41 = new JMenuItem("奖励");

jm42 = new JMenuItem("处分");

m1.add(jm11);

m2.add(jm21);

m2.add(jm22);

m2.add(jm23);

m3.add(jm31);

m3.add(jm32);

m4.add(jm41);

m4.add(jm42);

Icon i1 = new ImageIcon();

Icon i2 = new ImageIcon();

Icon i3 = new ImageIcon();

jb1 = new JButton(i1);

jb1.setToolTipText("输入");

jb2 = new JButton(i2);

jb2.setToolTipText("查询");

jb3 = new JButton(i3);

jb3.setToolTipText("退出");

JToolBar tb = new JToolBar("系统工具");

tb.add(jb1);

tb.add(jb2);

tb.add(jb3);

add(tb,BorderLayout.NORTH);

jm11.addActionListener(this);

jm21.addActionListener(this);

jm22.addActionListener(this);

jb1.addActionListener(this);

jb2.addActionListener(this);

jb3.addActionListener(this);

clayout = new CardLayout();

pframe = new JPanel(clayout);

add(pframe);

JPanel mainp = new JPanel(new BorderLayout());

JLabel mainl = new JLabel("学生信息管理平台",SwingConstants.CENTER);

mainl.setFont(new Font("serif",Font.BOLD,30));

mainp.add(mainl);

pframe.add(mainp,"main");

clayout.show(pframe, "main");

}

public void actionPerformed(ActionEvent e){

if(e.getSource() == jm21 || e.getSource() == jb1){

if(ip == null){

ip= new InsertPanel();

pframe.add(ip,"insert");

}

clayout.show(pframe, "insert");

this.setTitle("输入学生信息");

}

else if(e.getSource() == jm22 || e.getSource() == jb2){

if(sp == null){

sp= new SelectPanel();

pframe.add(sp,"select");

}

clayout.show(pframe, "select");

this.setTitle("查询学生信息");

}

else if(e.getSource() == jm11 || e.getSource() == jb3){

System.exit(0);

}

}

}

第二个：

import javax.swing.JFrame;

public class MainTest {

public static void main(String [] args){

MainFrame f = new MainFrame("学生信息管理平台");

f.setSize(400,300);

f.setLocation(350,250);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setVisible(true);

}

}

第二个：

import java.sql.Connection;

import java.sql.DriverManager;

public class MySQLConnection {

static Connection getCon(){

Connection con = null;

try{

Class.forName("com.mysql.jdbc.Driver");

con = DriverManager.getConnection("jdbc:mysql://localhost/test","root","123");

}

catch(Exception e){

System.out.println("建立数据库连接遇到异常！");

}

return con;

}

}

第四个：

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

public class SelectPanel extends JPanel implements ActionListener{

JButton jb;

JTextField jt;

JTextField jt1,jt2,jt3,jt4;

public SelectPanel(){

JLabel jl = new JLabel("请输入学号:",SwingConstants.CENTER);

jt = new JTextField();

jb = new JButton("确定");

JPanel jp1 = new JPanel(new GridLayout(1,3));

jp1.add(jl);

jp1.add(jt);

jp1.add(jb);

JLabel j1,j2,j3,j4;

j1 = new JLabel("学号:",SwingConstants.CENTER);

j2 = new JLabel("姓名:",SwingConstants.CENTER);

j3 = new JLabel("性别:",SwingConstants.CENTER);

j4 = new JLabel("年龄:",SwingConstants.CENTER);

jt1 = new JTextField(6);

jt1.setEditable(false);

jt2 = new JTextField(6);

jt2.setEditable(false);

jt3 = new JTextField(6);

jt3.setEditable(false);

jt4 = new JTextField(6);

jt4.setEditable(false);

JPanel jp2 = new JPanel(new BorderLayout());

JPanel jp3 = new JPanel(new GridLayout(4,2));

jp2.add(new JLabel(""),BorderLayout.NORTH);

jp3.add(j1);

jp3.add(jt1);

jp3.add(j2);

jp3.add(jt2);

jp3.add(j3);

jp3.add(jt3);

jp3.add(j4);

jp3.add(jt4);

jp2.add(jp3);

this.setLayout(new BorderLayout());

add(jp1,BorderLayout.NORTH);

add(jp2);

jb.addActionListener(this);

}

public void actionPerformed(ActionEvent e){

if(e.getSource() == jb){

String stuNo = jt.getText().trim();

Student s = new Student();

boolean b = true;

try{

b = s.selectByStuNo(stuNo);

}

catch(Exception ex){

System.out.println("查询学生信息遇到异常!");

}

if(b){

jt1.setText(s.getStuNo());

jt2.setText(s.getName());

jt3.setText(s.getGender());

int a = s.getAge();

Integer i = new Integer(a);

jt4.setText(i.toString());

}

else{

JOptionPane.showMessageDialog(null, "无此学生!");

}

}

}

}

第五个：

import javax.swing.JFrame;

public class SelectTest {

public static void main(String [] args){

JFrame f = new JFrame("查询学生信息");

SelectPanel p = new SelectPanel();

f.add(p);

f.setSize(400,300);

f.setLocation(300,250);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setVisible(true);

}

}

第六个：

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.Statement;

public class Student {

String stuNo;

String name;

String gender;

int age;

public Student(){}

public Student(String stuNo,String name,String gender, int age){

this.stuNo = stuNo;

this.name = name;

this.gender = gender;

this.age = age;

}

public String getStuNo(){

return stuNo;

}

public void setStuNo(String stuNo){

this.stuNo = stuNo;

}

public String getName(){

return name;

}

public void setName(String name){

this.name = name;

}

public String getGender(){

return gender;

}

public void setGender(String gender){

this.gender = gender;

}

public int getAge(){

return age;

}

public void setAge(int age){

this.age = age;

}

public boolean insertStudent(){

boolean b = true;

try{

Connection con = MySQLConnection.getCon();

Statement statement = con.createStatement();

String sql = "insert into student values('" + stuNo + "','" + name +"','" + gender + "'," + age + ")";

sql = new String(sql.getBytes("gb2312"),"ISO8859_1");

statement.executeUpdate(sql);

con.close();

}

catch(Exception e){

b = false;

System.out.println("插入数据库遇到异常！");

}

return b;

}

public boolean selectByStuNo(String stuNo)throws Exception{

boolean b = true;

Connection con = MySQLConnection.getCon();

Statement statement = con.createStatement();

String sql = "select * from student where stuNo =" + stuNo;

ResultSet rs = statement.executeQuery(sql);

if(rs != null rs.next()){

String no = rs.getString(1);

this.setStuNo(no);

String n = rs.getString(2);

n = new String(n.getBytes("ISO8859_1"),"gb2312");

this.setName(n);

String g = rs.getString(3);

g = new String (g.getBytes("ISO8859_1"),"gb2312");

this.setGender(g);

this.setAge(rs.getInt(4));

b = true;

}

rs.close();

statement.close();

con.close();

return b;

}

}

数据库你自己弄吧，我没时间弄了！初学得多动手哦

Java代码实现抽奖:从班级的学号中抽出一个一等奖,两个二等奖,三个三等奖

抽取问题, 重点是 同一个学号不能重复被抽取.

解决办法很多,

比如数组可以使用下标来标记,号码是否被使用,使用了就继续下一次抽取

也可以使用集合来抽取,把集合顺序打乱,然后随便抽几个就可以了

参考代码:数组法

import java.util.Random;

public class Test {

public static void main(String[] args) {

int stuNums=30;

int[] nums=new int[stuNums];//存储学号的数组

boolean[] flags=new boolean[stuNums];//标记,用于标记对应下标的学号是否已经被抽取过了

for (int i = 0; i  stuNums; i++) {

nums[i]=i+1;//给学号赋值

}

Random r=new Random();

while(true){

int index = r.nextInt(stuNums);

if(!flags[index]){

System.out.println("A等:"+nums[index]);

flags[index]=true; //标记已经被使用过了

break;

}

}

for (int i = 0; i  2; i++) {

int index = r.nextInt(stuNums);

if(!flags[index]){

System.out.println("B等:"+nums[index]);

flags[index]=true;

}else{

i--;//如果已经被抽取过了 ,那么i建议,再次循环

}

}

for (int i = 0; i  3; i++) {

int index = r.nextInt(stuNums);

if(!flags[index]){

System.out.println("c等:"+nums[index]);

flags[index]=true;

}else{

i--;

}

}

}

}

集合法

import java.util.ArrayList;

import java.util.Collections;

public class Test2 {

public static void main(String[] args) {

int stuNums=20;

ArrayListInteger list=new ArrayListInteger();

for (int i = 0; i  stuNums; i++) {

list.add(i+1);

}

System.out.println("有序"+list);

Collections.shuffle(list);//打乱顺序

System.out.println("乱序"+list);

System.out.println("A等"+list.get(0));

System.out.println("B等"+list.get(1));

System.out.println("B等"+list.get(2));

System.out.println("C等"+list.get(3));

System.out.println("C等"+list.get(4));

System.out.println("C等"+list.get(5));

}

}

java输出学生学号，姓名，成绩

public class Student {

private int kemu1, kemu2, kemu3, kemu4, kemu5;

public int getKemu1() {

return kemu1;

}

public void setKemu1(int kemu1) {

this.kemu1 = kemu1;

}

public int getKemu2() {

return kemu2;

}

public void setKemu2(int kemu2) {

this.kemu2 = kemu2;

}

public int getKemu3() {

return kemu3;

}

public void setKemu3(int kemu3) {

this.kemu3 = kemu3;

}

public int getKemu4() {

return kemu4;

}

public void setKemu4(int kemu4) {

this.kemu4 = kemu4;

}

public int getKemu5() {

return kemu5;

}

public void setKemu5(int kemu5) {

this.kemu5 = kemu5;

}

}

上边的是Student类

import java.util.ArrayList;

import java.util.Random;

public class Test {

public static void main(String[] args) {

ArrayListStudent list = new ArrayListStudent();

// 初始化成绩

for (int n = 0; n  20; n++) {

Student st = new Student();

st.setKemu1(new Random().nextInt(100));

st.setKemu2(new Random().nextInt(100));

st.setKemu3(new Random().nextInt(100));

st.setKemu4(new Random().nextInt(100));

st.setKemu5(new Random().nextInt(100));

list.add(st);

}

// 计算平均成绩

int avg = 0;

for (int n = 0; n  20; n++) {

avg += list.get(n).getKemu1();

avg += list.get(n).getKemu2();

avg += list.get(n).getKemu3();

avg += list.get(n).getKemu4();

avg += list.get(n).getKemu5();

}

double avg2 = avg / 20;

System.out.println("全班平均成绩" + avg2);

// 计算谁得奖

for (int n = 0; n  20; n++) {

double avg3;

int avg4 = 0;

avg4 += list.get(n).getKemu1();

avg4 += list.get(n).getKemu2();

avg4 += list.get(n).getKemu3();

avg4 += list.get(n).getKemu4();

avg4 += list.get(n).getKemu5();

avg3 = avg4;

System.out.println((n + 1) + "成绩为" + avg3);

if (avg3  (avg2 * 1.2)) {

System.out.println((n + 1) + "该生获得1等将");

}

if (avg3  (avg2 * 1.1)) {

System.out.println((n + 1) + "该生获得2等将");

}

}

}

}

好了 可以了

ArrayList是动态数组

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