编写java程序，计算π的近似值，用π=4（1-1/3+1/5-1/7+……+（-1）^i+1/2i-1)

public class CalculatePi {
public static void main(String[] args) {
double pi = 0;
int i = 0;
while (true) {
double term = Math.pow(-1, i) / (2 * i + 1);
if (term == 0) {
break;
}
pi += term;
i++;
}
pi *= 4;
System.out.println("π ≈ " + pi);
}
}