Math类有哪些常用的方法

public static int abs(int a) ,

public static long abs(long a),

public static float abs(float a), 

public static double abs(double a),                  --------------abs方法求绝对值

public static native double acos(double a)        -------------acos求反余弦函数

public static native double asin(double a)        -------------asin求反正切函数

public static native double atan(double a)        -------------atan求反正切函数

public static native double ceil(double a)        -------------ceil返回值最小的大于a的整数

public static native double cos(double a)        -------------cos求余弦函数

public static native double exp(double a)        -------------exp求e的a次幂

public static native double floor(double a)        -------------floor返回最大的小于a的数

public static native double log(double a)        -------------log返回lna

public static native double pow(double a，double b)------pow求a的b次幂

public static native double sin(double a)        -------------sin求正弦函数

public static native double sqrt(double a)      -------------sqrt求a的开平方

public static native double tan(double a)      -------------tan求正切函数

public static synchronized double random() -------------返回0~1的随机数

 

native 关键字