java - 将用户输入从整数转换为 double

Question

我试图要求用户输入 4 个整数值，后跟 4 个 double 值。我不断收到错误“可能从 double 到 int 的有损转换”。我尝试过不同的方法，但不明白简单的转换。另外..可能有更好的方法吗？对我来说任何建议都是有帮助的。最终我将打印出这些值......

import java.util.Scanner;

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

       Scanner keyboard = new Scanner(System.in);

       int[] intNumbers = new int[4];

       // Prompt user to enter 4 integer values here
       System.out.println("Enter 4 integer numbers below");

       // intNumbers only excepts 4 values with the for loop
       for (int i = 0; i < 4 && keyboard.hasNextInt(); i++) {
           intNumbers[i] = keyboard.nextInt();
       }

       double[] dblNumbers = new double[4];

       // Prompt users to enter 4 double values here
       System.out.println("Enter 4 double numbers below");

       // dblNumbers only excepts 4 values with the for loop
       for (double i = 0; i < 4 && keyboard.hasNextDouble(); i++) {
           dblNumbers[i] = keyboard.nextDouble();
       }

Answer 1

您不应该使用double 作为数组的索引。始终使用 int 作为索引。改变

for (double i = 0; i < 4 && keyboard.hasNextDouble(); i++) {
    dblNumbers[i] = keyboard.nextDouble();
}

至

//   vvv
for (int i = 0; i < 4 && keyboard.hasNextDouble(); i++) {
    dblNumbers[i] = keyboard.nextDouble();
}