randdemo.java~1~

来自「java2参考大全上的例子的源码和自己的理解.」· JAVA~1~ 代码 · 共 46 行

package random;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

// Demonstrate random Gaussian values.
import java.util.Random;

class RandDemo {
  public static void main(String args[]) {
    Random r = new Random();
    double val;
    double sum = 0;
    int bell[] = new int[10];

    for (int i = 0; i < 100; i++) {
      val = r.nextGaussian();
      sum += val;
      double t = -2;

      for (int x = 0; x < 10; x++, t += 0.5) {
        if (val < t) {
          bell[x]++;
          break;
        }
      }
    }
    System.out.println("Average of values: " +
                       (sum / 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();
    }
  }
}