先幫你做好了 晚點(diǎn)再給你說一下

package tse;

import java.util.Scanner;

public class gkt1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner (System.in);
        String anwer=" ";
        String ou = null ;//賬號(hào)
        String pu = null ;//密碼
        String o =  null ;//賬號(hào)
        String p = null;//密碼
        int max=9999;
        int min=1000;
        int num=0;
        int sum;
        int j;
        int c=0;
        int cardNumber = 0;
        do{
            System.out.println("******歡迎進(jìn)入獎(jiǎng)客富翁系統(tǒng)*****");
            System.out.println("\t"+"1.注冊(cè)");
            System.out.println("\t"+"2.登錄");
            System.out.println("\t"+"3.抽獎(jiǎng)");
            System.out.println("**********************");
            System.out.println("請(qǐng)選擇菜單：");
            int i=input.nextInt();  

            switch(i){
            case 1:     
                System.out.println("[獎(jiǎng)客富翁系統(tǒng)>注冊(cè)]");
                System.out.println("請(qǐng)?zhí)顚憘€(gè)人注冊(cè)信息：");
                System.out.print("輸入用戶名：");
                o =input.next(); //賬號(hào)
                System.out.print("輸入密碼：");      
                p = input.next(); //密碼
                System.out.println("\n");
                System.out.println("注冊(cè)成功，請(qǐng)記好你的會(huì)員卡號(hào)");
                cardNumber=(int)(Math.random()*(max-min))+min;
                System.out.println("用戶名"+"\t"+"密碼"+"\t"+"會(huì)員卡號(hào)");
                System.out.println(o+"\t\t"+p+"\t"+cardNumber);
                break;
            case 2:
                System.out.println("[獎(jiǎng)客富翁系統(tǒng)>登錄]");
                System.out.print("請(qǐng)輸入用戶名：");
                ou=input.next();
                System.out.print("請(qǐng)輸入密碼：");
                pu=input.next();    
                
                if (ou.equals(o)&&pu.equals(p)) {   //驗(yàn)證賬號(hào)密碼
                    
                    System.out.println("歡迎登入獎(jiǎng)客富翁系統(tǒng)");
                }else {
                    System.out.println("輸入錯(cuò)誤");
//                  break;
                }
                
                break;
            case 3:
                System.out.println("[獎(jiǎng)客富翁系統(tǒng)>抽獎(jiǎng)]");
                System.out.print("請(qǐng)輸入您的卡號(hào)：");               
                num=input.nextInt();
                int[] sum1=new int[5];  
                System.out.print("本日的幸運(yùn)會(huì)員為");
                for(j=0;j<sum1.length;j++){
                    sum1[j]=(int)(Math.random()*(max-min))+min;
                    System.out.print("\t"+sum1[j]+"\t");
                    if (num==sum1[j]) {
                        c=1;
                        //有幸運(yùn)日
                    }
                }
                if(c==1){
                        System.out.println("恭喜你是今日幸運(yùn)會(huì)員");
                    }else{
                        System.out.println(" ");
                        System.out.println("抱歉！你不是本日的幸運(yùn)會(huì)員");    
                    }
                break;
                
                default:
                System.out.println("輸入錯(cuò)誤請(qǐng)從新輸入");
                break;
            
            }
            System.out.println("繼續(xù)嗎（y/n）");
            anwer=input.next();
        }while("y".equals(anwer));  
        System.out.println("系統(tǒng)退出，謝謝使用,愛你喲么么噠！");
    }
}