Random

Random

java.util

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Java 1.0

serializable

This class implements a pseudorandom number generator suitable for games and similar applications. If you need a cryptographic-strength source of pseudorandomness, see java.security.SecureRandom . nextdouble( ) and nextFloat( ) return a value between 0.0 and 1.0. nextLong( ) and the no-argument version of nextInt( ) return long and int values distributed across the range of those data types. As of Java 1.2, if you pass an argument to nextInt( ) , it returns a value between zero (inclusive) and the specified number (exclusive). nextGaussian( ) returns pseudorandom floating-point values with a Gaussian distribution; the mean of the values is 0.0 and the standard deviation is 1.0. nextBoolean( ) returns a pseudorandom boolean value, and nextBytes( ) fills in the specified byte array with pseudorandom bytes. You can use the setSeed( ) method or the optional constructor argument to initialize the pseudorandom number generator with some variable seed value other than the current time (the default) or with a constant to ensure a repeatable sequence of pseudorandomness.

Figure 16-52. java.util.Random

 public class  Random  implements Serializable {  // Public Constructors  public  Random  ( );        public  Random  (long  seed  );  // Public Instance Methods   1.2  public boolean  nextBoolean  ( );  1.1  public void  nextBytes  (byte[ ]  bytes  );        public double  nextDouble  ( );        public float  nextFloat  ( );        public double  nextGaussian  ( );  synchronized  public int  nextInt  ( );  1.2  public int  nextInt  (int  n  );        public long  nextLong  ( );        public void  setSeed  (long  seed  );  synchronized   // Protected Instance Methods   1.1  protected int  next  (int  bits  );   } 

Subclasses

java.security.SecureRandom

Passed To

java.math.BigInteger.{BigInteger( ) , probablePrime( )} , Collections.shuffle( )