Math类

public class MathDemo {
    public static void main(String[] args) {
        System.out.println("-12的绝对值为：" + Math.abs(-12));
        System.out.println("0.2的反余弦值为：" + Math.acos(0.2));
        System.out.println("27的立方根为：" + Math.cbrt(27));
        System.out.println("pi/3的余弦值为：" + Math.cos(Math.PI / 3));
        System.out.println("5和3的较大值为：" + Math.max(5, 3));
        System.out.println("pi的值为：" + Math.PI);// 较精确
        System.out.println("4的平方根为：" + Math.sqrt(4));

    }
}