Java中Math类常用方法代码详解

public class Demo{  public static void main(String args[]){     /**      *Math.sqrt()//计算平方根     *Math.cbrt()//计算立方根     *Math.pow(a, b)//计算a的b次方     *Math.max( , );//计算最大值     *Math.min( , );//计算最小值     */     System.out.println(Math.sqrt(16));  //4.0     System.out.println(Math.cbrt(8));  //2.0    System.out.println(Math.pow(3,2));   //9.0    System.out.println(Math.max(2.3,4.5));//4.5    System.out.println(Math.min(2.3,4.5));//2.3    /**      * abs求绝对值      */     System.out.println(Math.abs(-10.4));  //10.4     System.out.println(Math.abs(10.1));   //10.1     /**      * ceil天花板的意思，就是返回大的值     */     System.out.println(Math.ceil(-10.1));  //-10.0     System.out.println(Math.ceil(10.7));  //11.0     System.out.println(Math.ceil(-0.7));  //-0.0     System.out.println(Math.ceil(0.0));   //0.0     System.out.println(Math.ceil(-0.0));  //-0.0     System.out.println(Math.ceil(-1.7));  //-1.0    /**      * floor地板的意思，就是返回小的值      */     System.out.println(Math.floor(-10.1)); //-11.0     System.out.println(Math.floor(10.7));  //10.0     System.out.println(Math.floor(-0.7));  //-1.0     System.out.println(Math.floor(0.0));  //0.0     System.out.println(Math.floor(-0.0));  //-0.0     /**      * random 取得一个大于或者等于0.0小于不等于1.0的随机数      */     System.out.println(Math.random()); //小于1大于0的double类型的数    System.out.println(Math.random()*2);//大于0小于1的double类型的数    System.out.println(Math.random()*2+1);//大于1小于2的double类型的数    /**      * rint 四舍五入，返回double值      * 注意.5的时候会取偶数  异常的尴尬=。=     */     System.out.println(Math.rint(10.1));  //10.0     System.out.println(Math.rint(10.7));  //11.0     System.out.println(Math.rint(11.5));  //12.0     System.out.println(Math.rint(10.5));  //10.0     System.out.println(Math.rint(10.51));  //11.0     System.out.println(Math.rint(-10.5));  //-10.0     System.out.println(Math.rint(-11.5));  //-12.0     System.out.println(Math.rint(-10.51)); //-11.0     System.out.println(Math.rint(-10.6));  //-11.0     System.out.println(Math.rint(-10.2));  //-10.0     /**      * round 四舍五入，float时返回int值，double时返回long值      */     System.out.println(Math.round(10.1));  //10     System.out.println(Math.round(10.7));  //11     System.out.println(Math.round(10.5));  //11     System.out.println(Math.round(10.51)); //11     System.out.println(Math.round(-10.5)); //-10     System.out.println(Math.round(-10.51)); //-11     System.out.println(Math.round(-10.6)); //-11     System.out.println(Math.round(-10.2)); //-10   } }