问题描述
基本上,假设我有一个可以容纳10个数字的int数组.这意味着我可以在每个索引中存储0-9(每个数字只能存储一次).
Basically, let's say I have an int array that can hold 10 numbers. Which mean I can store 0-9 in each of the index (each number only once).
如果我运行以下代码:
int[] num = new int[10];
for(int i=0;i<10;i++){
num[i]=i;
}
我的数组如下所示:
[0],[1],.....,[8],[9]
但是,每次运行代码时如何对数字分配进行随机化?例如,我希望数组看起来像这样:
But how do I randomize the number assignment each time I run the code?For example, I want the array to look something like:
[8],[1],[0].....[6],[3]
推荐答案
使它成为 List< Integer>
而不是数组,并使用Collections.shuffle()对其进行随机排序.改组后,您可以从列表中构建int [].
Make it a List<Integer>
instead of an array, and use Collections.shuffle() to shuffle it. You can build the int[] from the List after shuffling.
如果您真的想直接进行随机播放,请搜索"Fisher-Yates随机播放".
If you really want to do the shuffle directly, search for "Fisher-Yates Shuffle".
以下是使用列表技术的示例:
Here is an example of using the List technique:
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Test {
public static void main(String args[]) {
List<Integer> dataList = new ArrayList<Integer>();
for (int i = 0; i < 10; i++) {
dataList.add(i);
}
Collections.shuffle(dataList);
int[] num = new int[dataList.size()];
for (int i = 0; i < dataList.size(); i++) {
num[i] = dataList.get(i);
}
for (int i = 0; i < num.length; i++) {
System.out.println(num[i]);
}
}
}
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