java-缓慢的计算处理

Question

我尝试运行它，但是它非常慢。需要一段时间才能处理并完成计算。无论如何，我是否可以改进它或使其更快，更有效地工作？

int n = 25;
int len = (int) Math.pow(2, n);
String[][] BinaryNumbers = new String[len][];
int[] DummyArray = new int[n];
int[][] BinaryNumbersInt = new int[len][];

for (int count = 0; count < len; count++) {
    BinaryNumbers[count] = String.format("%" + n + "s",
                                    Integer.toBinaryString(count)).replace((" "), ("0"))
                                .split("");

    for (int i = 0; i < n; i++) {
        DummyArray[i] = Integer.parseInt(BinaryNumbers[count][i]);
    }

    BinaryNumbersInt[count] = Arrays.copyOf(DummyArray, DummyArray.length);
}

谢谢！

Answer 1

您正在做很多无用的字符串操作。尝试这样的事情：

for (int count = 0; count < len; count++) {
    int[] DummyArray = new int[n];
    int x = count;
    for (int i = 0; i < n; i++) {
        DummyArray[n-i-1] = x & 1;
        x >>= 1;
    }

    BinaryNumbersInt[count] = DummyArray;
}