Question

我使用数组和方法编写了一个代码，该代码允许用户输入任意数量的数字，并且显示从最小到最大的数字，但是该程序可以运行，但是没有显示数字，这是我写的代码

import java.util.Scanner;

public class Numbers {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("How many numbers you want to enter? ");
        int size = s.nextInt();
        int i;
        double[] numbers1 = new double[size];
        System.out.println("Enter " + numbers1.length + " numbers: ");
        getNumbers(numbers1);

        double[] numbers2 = new double[numbers1.length];
        for (i = 0; i < numbers1.length; i++) {
            numbers2[i] = numbers1[i];
        }
        displayNumbers(numbers1);
        System.out.println("The numbers after sorting are: ");
        sortNumbers(numbers2);
        displayNumbers(numbers2);
    }

    public static void getNumbers(double[] numbers) {
        Scanner s = new Scanner(System.in);
        for (int i = 0; i < numbers.length; i++) {
            numbers[i] = s.nextDouble();
        }
    }

    public static void sortNumbers(double[] numbers) {
        double temp;
        double pass;
        for (pass = 0; pass < numbers.length; pass++) {
            for (int i = 0; i < numbers.length - 1; i++) {
                if (numbers[i] > numbers[i + 1]) {
                    temp = numbers[i];
                    numbers[i] = numbers[i + 1];
                    numbers[i + 1] = temp;
                }
            }
        }
    }

    public static void displayNumbers(double[] numbers) {
        Scanner s = new Scanner(System.in);
        for (int i = 0; i < numbers.length; i++) {
            numbers[i] = s.nextDouble();
            System.out.print(numbers + " ");
        }

        System.out.println();
    }

}

Answer 1

您的displayNumbers()方法错误。在循环中，您写道：

numbers[i] = s.nextDouble();
System.out.print(numbers + " " );

您正试图再次读取4个double（每次调用该方法），并且正在打印整个数组（它并没有达到您的期望）。您可能想要的是这样：

System.out.print(numbers[i] + " " );

Answer 2

您的代码效率低下，不清楚。

您不需要每次都创建一个新的Scanner，也不需要为什么用println代替Arrays.toString(double[])这个数组。

您还应该提供更简洁的说明和变量名。

下面是代码的示例

    public static void main(String[] args)
    {
        //create a new Scanner with a name that defines it
        Scanner scanner = new Scanner(System.in);
        //print your instructions
        System.out.println("How many numbers would you like to sort?");
        //print "> " to let the user to know he should be entering values
        System.out.print("> ");
        //read the number the user has entered which we will define as how many numbers he would enter next
        int totalNumbers = scanner.nextInt();
        //create a new array the size of the total numbers
        double[] unsortedNumbers = new double[totalNumbers];
        //tell the user to enter his unsorted numbers
        System.out.println("Enter your unsorted numbers: ");
        //loop totalNumbers times until the whole unsortedNumbers is full
        for(int index = 0; index < totalNumbers; index++)
        {
            System.out.print("> ");
            unsortedNumbers[index] = scanner.nextDouble();
        }
        //Print the numbers he entered
        System.out.println("You entered: ");
        //Arrays.toString prints the array in format [number, number, ...]
        System.out.println(Arrays.toString(unsortedNumbers));
        //sort the arrays with Arrays.sort which sorts in ascending numerical order
        Arrays.sort(unsortedNumbers);
        //Print the final result - sorted numbers
        System.out.println("Sorted: " + Arrays.toString(unsortedNumbers));
    }

我使用数组和方法编写了代码，以显示最小编号或最大编号中的数字

2 个答案: