java常用工具类总结

package _22javacoreclass;

import java.security.SecureRandom;

public class Main4 {
    public static void main(String[] args){
        // 绝对值
        System.out.println(Math.abs(-100));
        System.out.println(Math.abs(-7.8));
        //最大值最小值
        System.out.println(Math.max(100,99));
        System.out.println(Math.min(1.2,2.3));
        //计算xy次方
        System.out.println(Math.pow(2, 10));
        //计算√x
        System.out.println(Math.sqrt(2));
        //计算ex次方
        System.out.println(Math.exp(2));
        //计算以e为底的对数
        System.out.println(Math.log(4));
        //计算以10为底的对数
        System.out.println(Math.log10(100));
        //三角函数
        System.out.println(Math.sin(3.14));
        System.out.println(Math.cos(3.14));
        System.out.println(Math.tan(3.14));
        System.out.println(Math.asin(1.0));
        System.out.println(Math.acos(1.0));
        //数学常量
        System.out.println(Math.PI);
        System.out.println(Math.E);
        System.out.println(Math.sin(Math.PI / 6));
        //随机数
        System.out.println(Math.random());
        System.out.println(Math.asin(1.0));
        System.out.println(Math.asin(1.0));
        System.out.println(Math.asin(1.0));
        //真随机数
        SecureRandom sr = new SecureRandom();
        System.out.println(sr.nextInt(100));

    }
}