时间戳

首页 > 解决方案 > 试图检查用户对我的数组的输入

java - 试图检查用户对我的数组的输入

问题描述

我对 Java 完全陌生，我试图让用户输入来检查我的数组是否有有效输入并继续代码，如果在我得到有效输入之前重复是无效的。

public class Cheesecake {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        float biteSize = 3;                                                     
        float small = 9;
        float large = 12;
        String chosenSize;
        double pricePerInch = 0;
        double total = 0;
        String[] chooseSizes = {"bite size", "small", "large"};
        String[] chooseFlavors = {"plain", "strawberry", "raspberry", "caramel", "chocolate"} ;



        Scanner scnr = new Scanner(System.in);

        System.out.println("Flavors to choose from: plain, strawberry, raspberry, caramel, chocolate.");        //giving user flavor list

        /*System.out.println("Please choose flavor:");                                          

        flavors = scnr.nextLine();*/

        String flavors;
        while (true) {
            System.out.println("Please choose flavor:");                                            
            flavors = scnr.nextLine();
            if (flavors.equals(chooseFlavors))
                break;
            else
                System.out.println("Please choose from flavors above.");

标签： javaarraysuser-input

解决方案

您必须使用 . 检查数组的每个索引flavors。（应该可能重命名为userFlavor）。

String[] chooseFlavors = {"plain", "strawberry", "raspberry", "caramel", "chocolate"};
... 

boolean flavorFound = false;
while (!flavorFound) { // Loop until flavorFound is true
  System.out.println("Please choose flavor:");                                            
  userFlavor = scnr.nextLine();

  for(int i = 0; i < chooseFlavors.length; i++) { // Loop from 0 to choosFlavors.length
      if(userFlavor.equals(chooseFlavors[i]) { // Compare user input to flavor at index i
          System.out.println(userFlavor + " found at index " + i);
          flavorFound = true; // This is the flag to break out of while loop
          break; // Only breaks out of for loop
      } else {
          System.out.println("Please choose from flavors above.");
      }
  }

}

推荐阅读