Write a program to calculate the result of the formula pi in java 𝜋=4(1−1/3+1/5−1/7+1/9−1/11+1/13−⋯−1/2𝑖−1+1/2𝑖+1) with 10000 ≤ i ≤ 100000

public double pi() {
    double pi = 0;
    for (int i = 1; i < 100000; i += 2) {
        if (i % 4 == 1) {
            pi += 1.0 / i;
        } else {
            pi -= 1.0 / i;
        }
    }
    return pi * 4;
}