案例：实现双色球

import java.util.Random;
import java.util.Scanner;

public class code6 {
    public static void main(String[] args) {
        //创建中奖号码

        //将用户输入的号码存入数组
        int[] user=user();
        //打印出用户输入的号码
        print(user);
        int[] user2=creat();

        contrast(user,user2);
        System.out.println("中奖号码是:");
        print(user2);

    }
    //利用随机数生成去创建中奖号码数组
    public static int[] creat(){
        Random r=new Random();
        int[] sum=new int[7];
        //生成红球的六个中奖号码
        for (int i = 0; i <sum.length-1; i++) {
            while(true) {
                int num = r.nextInt(1, 34);
                //通过exist2方法去判断生成的数字是否重复
                if(!exist(sum,num)){
                    sum[i]=num;
                    break;
                }
            }
        }
        //生成蓝球的中奖号码
        int num1 = r.nextInt(1, 17);
        sum[6]=num1;
        return sum;
    }

    //去比较用户输入的双色球数组和系统随机生成的中奖数组是否相同
    public static void contrast(int[] number,int[] number2){
        int count=0;
        for (int i = 0; i < number.length-1; i++) {
            for (int j = 0; j < number2.length-1; j++) {
                    if(number[i]==number2[j]){
                        count++;
                        break;
                    }
            }
        }
        int blue=(number[6]==number2[6]?1:0);
        System.out.println("恭喜你命中红球个数为:"+count);
        System.out.println("恭喜你命中蓝球个数为:"+blue);
    }

    //将用户的数组和系统生成的中奖数组打印出来
    public static void print(int[] arr){
        System.out.print("[");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(i==arr.length-1 ? arr[i] : arr[i]+",");
        }
        System.out.println("]");
    }
    //将用户输入的号码存入数组中
    public static int[] user(){
        int[] numbers=new int[7];
        Scanner sc=new Scanner(System.in);
        //输入红球的号码
        for (int i = 0; i < numbers.length-1; i++) {
            while (true) {
                System.out.println("请输入第"+(i+1)+"个红球号码:");
                int number=sc.nextInt();
                //判断输入的号码是否符合要求
                if(number>33||number<1){
                    System.out.println("输入错误，请重新输入:");
                }else{
                    if(exist(numbers,number)){
                        System.out.println("输入重复");
                    }else{
                        numbers[i]=number;
                        break;
                    }
                }
            }
        }
        //输入蓝球的号码
        while (true) {
            System.out.println("请输入蓝球号码:");
            int number=sc.nextInt();
            if(number<1||number>16){
                System.out.println("输入错误请重新输入:");
            }else{
                numbers[6]=number;
                break;
            }
        }
        return numbers;
    }

    //判断用户当前输入的号码与之前的号码是否重复
    private static boolean exist(int[] numbers, int number) {
        for (int i = 0; i < numbers.length; i++) {
            if(numbers[i]==0){
                break;
            }
            if(numbers[i]==number){
                return true;
            }
        }
        return false;
    }
}