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  제목   [JAVA] Random Number 1998/09/30 (12:37)
이름 김효원
번호 27
조회 486
본문 Java의 random number generator는 default로
current time을 seed로 이용한다.

Random r=new Random(); // time을 seed로
Random r=new Random(32) ; // 32를 seed로 이용
setSeed(); // 새로운 seed를 설정한다.


Random() // Create a new random number generator
Random(long) // Create a generator using a seed
nextDouble() // Return a pseudo-random uniformly distributed Double
nextFloat()    // Return a random float
nextGaussian() // Return a Gaussian Distributed Double
nextInt()      // Return a random int
nextLong()     // Return a random long
setSeed(long)  // Set the seed


//example

import java.lang.Math;
import java.util.Date;
import java.util.Random;

class Random1{
   public static void main(String args[]) throws java.io.IOException
   {
       int count=6;
       Random randGen=new Random();

       System.out.println("Uniform_Random_Integers");
       for(int i=0;i<count;i++)
           System.out.print(randGen.nextInt()+"_");
       System.out.println("\n");

       System.out.println("Uniform_Random_Floats");
       for(int i=0;i<count;i++)
           System.out.print(randGen.nextFloat()+"_");
       System.out.println("\n");

       System.out.println("Uniform_Random_Floats");
       for(int i=0;i<count;i++)
           System.out.print(randGen.nextGaussian()+"_");                      
           System.out.print(randGen.nextGaussian()+"_");
       System.out.println("\n");

              System.out.println("Uniform_Random_Integers_[1,6]_");
       for(int i=0;i<count;i++)
System.out.print((Math.abs(randGen.nextInt())%6+1)+"_");
       System.out.println("\n");
   }
}         
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