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