Common static methods of math class

Math Class commonly used static methods

java.util.Math Class is a tool class related to mathematics , It provides a lot of static methods ,, Complete math related operations .

public static double abs(double num)   Get absolute value , There are many kinds of overloads 
public static double ceil(double num)  Rounding up 
public static double floor(double num)  Rounding down 
public static long round(double num)  rounding 
Math.PI    Approximate PI constant （double type ）