用Java编写一个，随机选择一个历史美女的代码案例，要求美女数量20个

import java.util.Random;

public class ChooseBeauty {
public static void main(String[] args) {
String[] beauties = {"貂蝉", "王昭君", "杨贵妃", "西施", "貂蝉", "王昭君", "杨贵妃", "西施", "貂蝉", "王昭君", "杨贵妃", "西施", "貂蝉", "王昭君", "杨贵妃", "西施", "貂蝉", "王昭君", "杨贵妃", "西施"};
Random rand = new Random();
int index = rand.nextInt(20);
System.out.println("今天我们选择的历史美女是：" + beauties[index]);
}
}