Question

我正在尝试编写从我的课本中复制的此类。据我了解，我完全按照原样复制了代码，只对变量名做了些微改动。但是，当我做任何事情时，两行number = getInt(Sc3, prompt);和d = getDouble(sc3, prompt);会抛出错误，指出“找不到适合getInt/getDouble(Scanner, String)的方法。为什么会这样，我可以用什么代码来解决呢？下面的代码。

import java.util.Scanner;

public class Console {

   private static Scanner sc3 = new Scanner(System.in);

   public static String getString(String prompt) {
      System.out.print(prompt);
      String s = sc3.next();
      sc3.nextLine();
      return s;
   }

   public static int getInt(String prompt) {
      int number = 0;
      boolean isValid = false;
      while (isValid) {
         System.out.print(prompt);
         if (sc3.hasNextInt()) {
            number = sc3.nextInt();
            isValid = true;
         }else {
            System.out.println("Error! Entry must be an integer. Please try again.");
         }
         sc3.nextLine();
      }
      return number;
   }

   public static int getInt(String prompt, int minimum, int maximum) {
      int number = 0;
      boolean isValid = false;
      while (!isValid) {
         number = getInt(sc3, prompt);
         if (number <= minimum) {
            System.out.println("Error. User entry nust be greater than" + " " + minimum + " " + ".");
         } else if (number >= maximum) {
            System.out.println("Error. User entry must be less than" + " " + maximum + " " + ".");
         } else {
            isValid = true;
         }
      }
      return number;
   }

   public static double getDouble(String prompt) {
      double d = 0;
      boolean isValid = false;
      while (!isValid) {
         System.out.print(prompt);
         if (sc3.hasNextDouble()) {
            d = sc3.nextDouble();
            isValid = true;
         } else {
            System.out.println("Error. Invalid number. Try again.");
         }
         sc3.nextLine();
      }
      return d;
   }

   public static double getDouble(String prompt, double minimum, double maximum) {
      double d = 0;
      boolean isValid = false;
      while (!isValid) {
         d = getDouble(sc3, prompt);
         if (d <= minimum) {
            System.out.println("Error. Number must be greater than" + minimum + ".");
         }else if (d >= maximum) {
            System.out.println("Error. Number must be less than" + maximum + ".");
         }else {
            isValid = true;
         }
         return d;
      }
   }
}

Answer 1

Java编程语言支持重载方法，并且Java可以区分具有不同方法签名的方法。这意味着，如果类中的方法具有不同的参数列表，则它们可以具有相同的名称

来自here

因此您缺少getInt(Scanner Sc3, String prompt)和getDouble(Scanner sc3, String prompt)方法。

为什么会出现这些找不到合适方法的错误？

1 个答案: