Common Methods for javaRandom classes

The construction method of the Random class:

Public Random (); // This constructor uses a number related to the relative time of the current system time as the number of seeds.

Public Random (long seed); // you can specify the number of seeds to create.



Method:

Public boolean nextBoolean ();

Public double nextDouble (); // generates a random double value, between 0 and 1.0)

Public int nextInt (); // range between int-231-231-1

Public int nextInt (int n); // [0, n)

Public void setSeed (long seed );

Random r = new Random ();

Double d1 = r. nextDouble ();

Double d2 = r. nextDouble () * 5; // [0, 5.0) means to increase the range by 5 times

Double d3 = r. nextDouble () * 1.5 + 1; // [1, 2.5) first generate a random number in the [0, 1.5) interval and Add 1.

Int n1 = nextInt (); // generates any integer

Int n2 = r. nextInt (10); // [0, 10)

N2 = Math. abs (r. nextInt () % 10); // [0, 10)


Int n2 = r. nextInt (n); // [0, n)

N2 = Math. abs (r. nextInt () % n );

Int n3 = r. nextInt (11); // [0, 10]

N3 = Math. abs (r. nextInt () % 11); // [0, 10]

Int n4 = r. nextInt (18)-3; // [-3, 15)

N4 = Math. abs (r. nextInt () % 18)-3;

The following java program demonstrates some basic operations:

Package nemo;

Import java. util .*;

Public class lala {

Public static void main (String [] args)

{

Random r = new Random ();

Int n2 = r. nextInt (10); // [0, 10)

Int n3 = r. nextInt (11); // [0, 10]

Int n1 = r. nextInt (18)-2; // [-2, 16)

System. out. println (n2 + "+ n3 +" "+ n1 );

Boolean b1 = r. nextBoolean ();

Boolean b2 = r. nextBoolean ();

System. out. println (b1 + "" + b2 );

Double d1 = r. nextDouble (); // [0, 1.0)

Double d2 = r. nextDouble () * 5; // [0, 5.0)

Double d3 = r. nextDouble () * 1.5 + 1; // [1, 2.5)

System. out. println (d1 + "" + d2 + "" + d3 );


}

}