如何使用while循环找到最大整数(n),使得n^3<12,000

您需要在循环中每次都设置nCubed值:

public static void main(String[] args) {
    int n = 0;
    int nCubed = (int) (Math.pow(n, 3));

    while (nCubed <12000) {
        n++;
        nCubed = (int) (Math.pow(n, 3));
    }
    System.out.println("The highest integer below 12000 is " +(n-1));
 }