java - 无法让这个 Java 程序工作

Question

好的，稍微更改了代码，但程序仍然无法正常运行。我希望能够在程序运行时在 java 控制台中输入产品类型（水果），输入任何类型的水果（香蕉、苹果或橙子），然后输入数量。

import java.util.*;

public class demo {

public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);

    String str[] = { "Bananas", "Apples", "Oranges" };
    double price[] = { 2.09, 2.59, 2.25 };
    int i = 0;
    int j = 0;

    System.out.print("Enter type of product: ");
    String string = sc.nextLine();
    if ("fruit".equals(string)) {
        while (i < str.length) {
            while (j < price.length) {
                System.out.print(str[i++] + ": " + "£" + (price[j++]) + "p per bag \n");

            }
        }
    }
    System.out.print("\n");
    System.out.print("Enter which type of " + string + ": ");

    String string1 = sc.nextLine();

    boolean strs = "bananas".equals(string1);
    boolean strs1 = "apples".equals(string1);
    boolean strs2 = "oranges".equals(string1);
    if (strs) {
        System.out.print("Enter qty of " + str[0] + " (by bag): ");
    }

    if (strs1) {
        System.out.print("Enter qty of " + str[1] + " (by bag): ");

    }
    if (strs2) {
        System.out.print("Enter qty of " + str[2] + " (by bag): ");
    }

    int qty = sc.nextInt();
    int[] a = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    int h = 1;
    if ((a[h] == (qty)) && (strs) || (strs1) || (strs2)){
        System.out.print("\n");
        System.out.print(qty + " bag(s) of " + string1 + " have been added to your basket, " + "total costing £"
                + (qty) * price[0] + "p");

        }
    }   
}

还有什么想法吗？

标签： java

Answer 1

错误在 String string = sc.next("fruit"); 将其更改为 sc.nextLine() 或类似下面的内容

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

String str[] = { "Bananas", "Apples", "Oranges" };
double stk[] = { 1.09, 1.59, 1.25 };
int i = 0;
int j =0;

try {
    System.out.print("Enter type of product: ");
    String string = sc.next();

    while (i < str.length) {
        while (j < stk.length) {
        System.out.print(str[i++] + ": " + "£" + (stk[j++]) + "p per bag \n");

        }
    }
    System.out.print("\n");
    System.out.print("Enter which type of "+string+": ");
    String string1 = sc.next();
    if(string1 != null) {
        System.out.print("Enter qty of "+string1+ "(per bag) \n");
    } 
    String string2 = sc.next();     
    if(string2 != null) {
            System.out.print("Enter qty of " +string2+ "(in lbs) \n");

    } 
    String string3 = sc.next();
    if (string3 != null) {
            System.out.print("Enter qty of " +string3+ "(in lbs) \n");

    }

} catch (Exception e) {
    System.out.println("Eror");
    e.printStackTrace();
    }
}