Java - 如何将 BigInteger 集转换为 BigInteger 数组

Question

我有以下代码:

public static BigInteger[] Cubes (int m){
    Set<BigInteger> result = new HashSet<BigInteger>();

    for (int i = 1;; i++){
        BigInteger check = BigInteger.valueOf(i).pow(3);
        if (String.valueOf(check).length() == m){
            result.add(check);
        }
        if (String.valueOf(check).length() > m) break;
    }

    // I now have a BigInteger set containing all my values. 
   // I need to cast this to a BigInteger[] over here.
   // Then, I can return a BigInteger array.

}

实现此目标的最有效方法是什么？

Answer 1

您可以尝试使用 Java 集合 toArray() method :

BigInteger[] output = result.toArray(new BigInteger[result.size()]);