User Input Homework

package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int select = 0;
        int input = 0;
        int count = 0;
        int max = 0;
        int min = 0;
        int index = 0;
        int[] nums = new int[10];
        int[] temp = new int[10];
        boolean check = true;
        while (select != 4) {
            System.out.println("Please choose an option:");
            System.out.println("1. Enter a number:");
            System.out.println("2. Print the greatest number.");
            System.out.println("3. Print the smallest number.");
            System.out.println("4. Exit program.");
            System.out.println("5. Print all the numbers.");
            System.out.println("6. Clear all the numbers.");
            select = scanner.nextInt();
            if (input > max)
                max = input;
            if (input < min)
                min = input;

            switch (select) {
                case 1:
                    if (count > nums.length - 1)
                        System.out.println("You can't print any more numbers.");
                    else {
                        System.out.print("Enter an integer: ");
                        input = scanner.nextInt();
                        nums[count] = input;
                        count++;
                    }
                    if (count > nums.length)
                        System.out.println("You can't print any more numbers.");
                    if (check) {
                        min = input;
                        max = input;
                        check = false;
                    }
                    if (max < input)
                        index++;
                    break;
                case 2:
                    if(count == 0)
                        check = true;
                    if (check) {
                        System.out.println("You must enter a number first!");
                    } else {
                        System.out.println(max);
                        for (int i = index; i < count; i++) {
                            nums[i] = nums[i + 1];
                        }
                        nums[count] = 0;
                        count--;
                        max = 0;
                        for (int i = 0; i < count; i++) {
                            if (nums[i] > max) {
                                max = nums[i];
                                index = i;
                            }
                        }
                    }
                    break;
                case 3:
                    if (check) {
                        System.out.println("You must enter a number first!");
                    } else
                        System.out.println(min);
                    break;
                case 4:
                    System.out.println("The program will now exit, bye!");
                    break;
                case 5:
                    if (count == 0) {
                        System.out.println("No numbers entered.");
                        min = 0;
                        max = 0;
                        check = true;
                    }
                    for (int i = 0; i < count; i++) {
                        System.out.print(i == count - 1 ? nums[i] : nums[i] + ",");
                    }
                    System.out.println("");
                    break;
                case 6:
                    for (int i = 0; i < nums.length; i++) {
                        nums[i] = 0;
                    }
                    count = 0;
                    System.out.println("All the numbers deleted.");
                    break;
                default:
                    System.out.println("Invalid number!");
                    break;
            }
        }
    }
}