[Common Java class libraries] _ math and random classes

[Common Java class libraries] _ math and random classes

Math instance:

Public class mathdemo01 {public static void main (string ARGs []) {// The methods in the math class are static methods, and the class is directly used. the method name () can be called in the form of system. out. println ("square root:" + math. SQRT (9.0); system. out. println ("calculate the maximum value of two numbers:" + math. max (10, 30); system. out. println ("minimum value of two numbers:" + math. min (10, 30); system. out. println ("2's 3rd power:" + math. pow (2, 3); system. out. println ("Rounding:" + math. round (33.6 ));}};

Random instance:

Import Java. util. random; public class randomdemo01 {public static void main (string ARGs []) {random r = new random (); // instantiate the random object for (INT I = 0; I <10; I ++) {system. out. print (R. nextint (100) + "\ t ");}}};