Java学习----Math函数

public class TestMath {

    public static void main(String[] args) {
        System.out.println(Math.E);
        System.out.println(Math.PI);
        System.out.println(Math.abs(-3.5));
        System.out.println(Math.ceil(3.5)); // >=
        System.out.println(Math.floor(3.5)); // <=
        System.out.println(Math.pow(2, 3));
        System.out.println(Math.random());// 0-1之间随机数
        System.out.println(Math.round(3.5)); // 四舍五入
    }
}

2.718281828459045
3.141592653589793
3.5
4.0
3.0
8.0
0.2921187058255972
4