我不确定如何使程序随机将输入放置到数组中 [英] I'm not sure how to make my program randomly place input into an array

问题描述

/**
 * Write a description of class RandomArray here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import java.util.Scanner;
import java.util.Random;
public class RandomArray
{
   
    public RandomArray()
    {
        
        String[] array;
        array = new String[10];
        Scanner input = new Scanner(System.in);
        Random rand = new Random();
        int random = rand.nextInt(11);
        
        
        for (int i=0; i < (array.length); i++) {
            System.out.print("Enter a country: ");
            String country = input.next();
             if (array[random] == null)
        array[random] = country;
        else
        array[random] = array[random];
            
        }
        
       
        
         for (String country: array)
        System.out.print(country + ",");

推荐答案

如果我理解正确的问题，则希望对包含国家/地区的数组进行改组.一种解决方案是将数组转换为ArrayList，然后使用

If I understand the question correct, you want the array with the countries to shuffeled. A solution would be to convert the array to an ArrayList and then use

Collections.shuffle(ArrayList list);

小例子:

Little example:

public class ShuffleTest {
    public static void main(String[] args) throws Exception {
		String[] stringArray = { "A", "E", "I", "O", "U" };
		ArrayList<String> list = new ArrayList<String>();
		for(String s : stringArray)
			list.add(s);
		Collections.shuffle(list);
		String[] randomStringArray = list.toArray(new String[list.size()]);
		for(String s2 : randomStringArray)
			System.out.println(s2);
	}
}

首先，我创建一个包含一些值的String数组.之后，我将其转换为ArrayList(可能有更好的方法将数组转换为ArrayList)并使用Collections.shuffle(list);.洗牌.如果需要将字符串放在数组而不是ArrayList中，则可以使用toArray()方法将ArrayList转换为数组.

莫里茨

First I create a String array with some values in it. After that I convert it to an ArrayList (There''s probably a better way for converting array''s to ArrayList''s) and use Collections.shuffle(list); to shuffle it. If you need the string to be in an array instead of an ArrayList you can use the toArray() method to convert the ArrayList to an array.

Moritz

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