Java starts from scratch 28 (Math class and Random Class)

First, math overview

Provides common mathematical operations and two static constants E (base of natural logarithm) and pi (π)

Second, common methods

 package   Com.pb.demo1;  public  class   Mathtest { static  void   main (string[] args) {System        . OUT.PRINTLN ( "squared root:" + math.sqrt (9.0 "The maximum value of two:" + Math.max (10,30 "minimum value for two numbers:" + math.min (10,30 2 of 3 times: "+ Math.pow (2,3 rounding: "+ math.round (33.6  System.out.println ("generate a random number between 0-1:" +math.random ()); }}  

Random class randomness is a randomly generated class that can specify a range of random numbers that can then be arbitrarily generated in this range.

No.	Method	Type	Describe
1	public boolean Nextboolean ()	Ordinary	Randomly generate a Boolean value
2	Public double nextdouble ()	Ordinary	Randomly generated double values
3	public float nextfloat ()	Ordinary	Randomly generated float values
4	public int Nextint ()	Ordinary	Randomly generated int values
5	public int Nextint (int n)	Ordinary	Randomly generates an int value for a given maximum value
6	Public long Nextlong ()	Ordinary	Generate a Long value randomly

 Package Com.pb.demo1; Import Java.util.Random;  Public class randomtest {    publicstaticvoid  main (string[] args) {        Random Random=new  random ();          for (int i = 1; I <=10; i++) {            System.out.println (Random.nextint (i));     }}}

Java starts from scratch 28 (Math class and Random Class)