Random 示例

//Demonstrate random Gaussian values.
import java.util.Random;
class RandDemo{
 public static void main(String[] args){
  Random r = new Random();
  double dblVal;
  double dblSum = 0;
  int bell[] = new int[10];

  for(int i=0;i<100;i++){
   dblVal = r.nextGaussian();
   dblSum += dblVal;
   double t = -2;
   for(int x=0;x<10;x++,t += 0.5)
    if(dblVal<t){
     bell[x]++;
     break;
    }
  }
  System.out.println("Average of values: " + (dblSum/100));
   
  //display bell curve,sideways
  for(int i=0;i<10;i++){
   for(int x=bell[i];x>0;x--)
    System.out.print("*");
   System.out.println();
  }
 }
}