用JAVA写出)1~30个数字，每次选择6个数字算为一注，每次最多可以选择5注

以下是用 Java 实现的代码：

import java.util.*;

public class LotteryGame {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int[] numbers = new int[30];
        for (int i = 0; i < numbers.length; i++) {
            numbers[i] = i + 1;
        }
        int maxTickets = 5;
        int ticketCount = 0;
        while (ticketCount < maxTickets) {
            System.out.print("Please choose 6 numbers (1-30) separated by spaces: ");
            int[] chosenNumbers = new int[6];
            for (int i = 0; i < chosenNumbers.length; i++) {
                chosenNumbers[i] = input.nextInt();
            }
            if (isValid(chosenNumbers, numbers)) {
                ticketCount++;
                System.out.println("Your ticket " + ticketCount + ": " + Arrays.toString(chosenNumbers));
            } else {
                System.out.println("Invalid numbers, please try again.");
            }
        }
    }

    public static boolean isValid(int[] chosenNumbers, int[] numbers) {
        if (chosenNumbers.length != 6) {
            return false;
        }
        Set<Integer> set = new HashSet<>();
        for (int num : chosenNumbers) {
            if (num < 1 || num > 30) {
                return false;
            }
            if (!set.add(num)) {
                return false;
            }
            if (!contains(numbers, num)) {
                return false;
            }
        }
        return true;
    }

    public static boolean contains(int[] numbers, int num) {
        for (int i = 0; i < numbers.length; i++) {
            if (numbers[i] == num) {
                numbers[i] = 0;
                return true;
            }
        }
        return false;
    }
}

这个程序允许用户选择每注的6个数字，并且验证这些数字是否有效（即数字在1到30之间，没有重复，且在可用数字列表中存在）。如果数字无效，则要求用户重新输入。程序最多允许用户选择5注。一旦用户选择了有效的数字，就会生成一张彩票并打印出来。