如何让我的其他方法正确地从数组中读取

Question

当我尝试运行此程序时，它将接受输入，但对于所有打印，它只打印0.0 0.0。我需要它来打印估算的数字，然后将平均值打印到小数点后2位。为什么它只打印0而不打印中的数字

import java.util.Scanner;
import java.util.Arrays;
public class pcCalculate 

{
double[] pcPrice = new double [10];
public static void main(String[] args)
{
Quiz input = new Quiz();
Quiz display = new Quiz();
Quiz avgCalc = new Quiz();
input.arrayInput();
display.displayPCPrices();
avgCalc.avgPCCalc();
}
public void displayPCPrices()
{
System.out.println(Arrays.toString(pcPrice));
}
public double avgPCCalc() 
{
int sum = 0;
for (int i=0; i < pcPrice.length; i++)
{
sum = (int) (sum + pcPrice[i]);
}
double average = sum / (double)pcPrice.length;
return average;
}
public void arrayInput()
{
Scanner price = new Scanner(System.in);
System.out.println("Enter Prices");
pcPrice[0] = price.nextDouble();
pcPrice[1] = price.nextDouble();
pcPrice[2] = price.nextDouble();
pcPrice[3] = price.nextDouble();
pcPrice[4] = price.nextDouble();
pcPrice[5] = price.nextDouble();
pcPrice[6] = price.nextDouble();
pcPrice[7] = price.nextDouble();
pcPrice[8] = price.nextDouble();
pcPrice[9] = price.nextDouble();
}

}

Answer 1

数组在循环中更好，在这种情况下，我会选择这样的东西：

import java.util.Scanner;
import java.util.Arrays;
public class pcCalculate {
double[] pcPrice = new double [10];
public static void main(String[] args){
Scanner price = new Scanner(System.in);
for(int i=0; i< pcPrice.length; i++){
System.out.print("Set Price " + (i + 1) + ":");
pcPrice[i] = price.nextDouble();
}
displayPCPrices();
System.out.println("The average is :" + avgPCCalc());
}
public void displayPCPrices()
{
System.out.println("The prices are: " + "n");
for(int i = 0; i< pcPrice.length; i++){
System.out.print(pcPrice[i] + " ");
}
}
public double avgPCCalc() 
{
double sum = 0;
for (int i=0; i < pcPrice.length; i++)
{
sum += pcPrice[i];
}
double average = sum / 10;
return average;
}

}

Answer 2

从main调用displayPCPrices方法，并将pcPrice作为参数传入：

import java.util.Scanner;
import java.util.Arrays;
public class pcCalculate
{
public static void main(String[] args)
{
double[] pcPrice = new double [10];
Scanner price = new Scanner(System.in);
System.out.println("Enter Prices");
pcPrice[0] = price.nextDouble();
pcPrice[1] = price.nextDouble();
pcPrice[2] = price.nextDouble();
pcPrice[3] = price.nextDouble();
pcPrice[4] = price.nextDouble();
pcPrice[5] = price.nextDouble();
pcPrice[6] = price.nextDouble();
pcPrice[7] = price.nextDouble();
pcPrice[8] = price.nextDouble();
pcPrice[9] = price.nextDouble();
displayPCPrices(pcPrice);
}
public void displayPCPrices(Array pcPrice)
{
System.out.println(Arrays.toString(pcPrice));
}
public double avgPCCalc() 
{
int sum = 0;
for (int i=0; i < pcPrice.length; i++)
{
sum = (int) (sum + pcPrice[i]);
}
double average = sum / (double)pcPrice.length;
return average;
}
}

EDIT：正如你所知，main(String[]args(是你程序的起点，从那里你可以调用其他方法并完成你的工作。没有其他东西会调用您的主方法。

第二版：如果你想和我谈谈你的编码实践，请给我留言，我看到你已经改变了你的问题，你错过了一些可以帮助你轻松解决这个问题的基本概念。