Java 用户输入，声明为 int？

Question

我是 Java 的新手，我想制作一个程序来计算甜甜圈的价格，方法是输入您想要的甜甜圈数量，然后根据您购买的甜甜圈数量告诉您价格是多少想要。

这是代码

    import java.util.Scanner;

class MyFirstProgram {
    public static void main(String args []){

        System.out.println("How many donuts do you want? Type in a number.");


        Scanner donuts = new Scanner(System.in);

        int price; price = 2;

        System.out.print("Price of " + donuts + " donuts is "); 
        System.out.println(donuts * price);


    }
}

我的代码中缺少什么？我在最后一行收到错误。我想我需要将甜甜圈声明为整数，以便我可以将它乘以价格。我需要做什么？

编辑：我明白了。这是现在的工作程序：

    import java.util.Scanner;

class MyFirstProgram {
    public static void main(String args []){

        System.out.println("Koliko krafna želiš? Upiši broj.");


        Scanner krafne = new Scanner(System.in);
        int num = krafne.nextInt();

        int cijena; cijena = 2;

        System.out.print("Cijena " + num + " krafni jest "); 
        System.out.print(num * cijena);
        System.out.println(" kn.");


    }
}

我用克罗地亚语写程序。

Answer 1

donuts 是一个扫描仪 class 对象，而不是您的输入。替换你的行

        Scanner donuts = new Scanner(System.in);

与以下

Scanner sc=new Scanner(System.in);
int donuts=sc.nextInt();

Answer 2

要从控制台获取输入，您应该使用扫描仪 class 对象

试试这个

导入java.util.Scanner；

class MyFirstProgram { public static void main(String args []){

    System.out.println("How many donuts do you want? Type in a number.");


    Scanner scr = new Scanner(System.in);
    int donuts = scr.nextInt();  /*scr is object of Scanner class and                       next int is used to take integer input*/

    int price; price = 2;

    System.out.print("Price of " + donuts + " donuts is "); 
    System.out.println(donuts * price);


}

}

Answer 3

如果您希望将甜甜圈作为输入，您需要将扫描仪设置为与甜甜圈不同的值，并将甜甜圈设置为整数。试试这个：

import java.util.Scanner;

class MyFirstProgram {
  public static void main(String args[]) {

    System.out.println("How many donuts do you want? Type in a number.");
    int donuts = in .nextInt();

    int price;
    price = 2;

    System.out.print("Price of " + donuts + " donuts is ");
    System.out.println(donuts * price);

  }
}}

Java 用户输入，声明为 int？

Java user input, declare as int?

java

input