问题描述
我是编程的新手,我试图找出一个简单的平均函数.我写了一个平均3个整数的函数.现在,我希望能够使用任何集合类和任何数字类并获得平均值.问题在于这些类不能使用+或/来获取平均值.
I am new to programming and I am trying to figure out a simple average function. I have written a function to average 3 integers. Now I would like to be able to use any collection class and any number class and get the average. The problem is with these classes you can't use + or / to get the average.
所以我想知道是否有任何变通办法可以使用这两个类?
So I am wondering if there are any work-arounds to be able to use these two classes?
这是我的第一个有效的功能:
here is my first function that works:
package refresh;
import java.util.*;
public class Average {
public static void main( String args[]){
int a, b, c;
float average;
Scanner scanner = new Scanner(System.in);
System.out.println("Enter First Number");
a = scanner.nextInt();
System.out.println("Enter Second Number");
b = scanner.nextInt();
System.out.println("Enter Third Number");
c = scanner.nextInt();
average = (float)(a+b+c)/3;
System.out.println("The Average Is "+average );
}
}
这是我到目前为止遇到的问题:
Here what I have so far for my problem:
package refresh;
import java.util.*;
public class Average {
public static void main( String args[]){
Collection numbers;
Number count;
Number average;
Scanner scanner = new Scanner(System.in);
System.out.println("Enter Numbers to be averaged");
numbers = (Collection) scanner.match();
count++;
average = numbers/count;
System.out.println("The Average Is "+average);
}
}
任何帮助都会很棒!感谢您的宝贵时间!
Any help would be great! Thanks for your time!
推荐答案
如果您不知道要尝试使用哪种数字,将String转换为数字(Scanner就是这么做的)是没有意义的.转换成.
It makes no sense to convert a String into a number (which is what Scanner does) if you don't know what kind of number you're trying to convert it into.
您几乎可以将任何数字表示为Double.如果需要任意精度,请使用BigDecimal.
You can represent pretty much any number as a Double. If you need arbitrary precision, use BigDecimal.
平均代码可以在Number接口上完全通用;只需使用doubleValue方法.如果您需要BigDecimal,那么它会更加复杂,您可能需要执行涉及instanceof的事情.
The averaging code can be fully generic over the Number interface; just use the doubleValue method. If you need BigDecimal, then it's more complicated and you probably need to do things involving instanceof.
这篇关于Java平均函数的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!