如何在Java中舍入*向下*整数？

public class RoundDownExample {
    public static void main(String[] args) {
        double num = 3.14159265359;
        double roundedDownNum = Math.floor(num);
        System.out.println("向下舍入后的整数: " + roundedDownNum);
    }
}

向下舍入后的整数: 3