我不能在Java中使用数学方法

public class MathExample {
    public static void main(String[] args) {
        double x = 3.14159;
        double y = 2.71828;

        System.out.println("sin(x) = " + Math.sin(x));
        System.out.println("cos(x) = " + Math.cos(x));
        System.out.println("tan(x) = " + Math.tan(x));
        System.out.println("log(y) = " + Math.log(y));
        System.out.println("log10(y) = " + Math.log10(y));
        System.out.println("exp(y) = " + Math.exp(y));
        System.out.println("sqrt(y) = " + Math.sqrt(y));
        System.out.println("round(x) = " + Math.round(x));
        System.out.println("abs(x) = " + Math.abs(x));
        System.out.println("max(x, y) = " + Math.max(x, y));
        System.out.println("min(x, y) = " + Math.min(x, y));
        System.out.println("random() = " + Math.random());
    }
}

import java.lang.Math;