1.Math
1.1介紹
用於執行基本數字運算的工具類
1.2常用方法
1.2.1abs
public static int abs•(int a)//獲取引數的絕對值
1.2ceil和floor
public static double ceil•(double a)//向上取整
public static double floor•(double a)//向下取整
1.2.3round
public static int round•(float a)//四捨五入
1.2.4max和min
public static int max•(int a,int b)
public static int min•(int a,int b)
1.2.5pow
public static double pow(double a,double b)//a的b次冪
1.2.6random
public static double random•()//返回值為double的隨機值，範圍[0.0,1.0)