java 向上、向下取整，四舍五入

public class MathTest {

    public static void main(String[] args) {

        // 四舍五入
        long round = Math.round(1.499);
        long round2 = Math.round(1.5);
        System.out.println(round);
        System.out.println(round2);

        // 向上取整
        int s = (int)Math.ceil(1.1);
        System.out.println(s);

        // 向下取整
        System.out.println((int)Math.floor(1.6));
    }
}