Math:用于数学运算的类
成员变量:
public static final double PI;圆周率
public static final double E;log2
成员方法:
public static int abs(int a);绝对值
public static double ceil(doiuble a);向上取整
public static double floor(double a);向下取整
public static int max(int a, int b);最大值
public static int min(int a, int b);最小值
public static double pow(double a,double b);a的b次幂
public static double random();随机数,[0-1.0]
public static int round(float a);四舍五入.
public static double sqrt(double a);正平方根
