dice.java

来自「Java 入门书的源码」· Java 代码 · 共 36 行

//Copyright (c) 1998, Arthur Gittleman
//This example is provided WITHOUT ANY WARRANTY either expressed or implied.

/* Simulates the rolling of two dice.
 * The use inputs the number of tosses.
 * Imports the package iopack.
 * Uses arrays to tabulate the results.
 */ 

import iopack.Io;

public class Dice {
  public static int roll() {
    int die1 = (int)(6*Math.random())+ 1;
    int die2 = (int)(6*Math.random())+ 1;
    return die1 + die2;
  }
  public static int[]tossResults(int number) {
    int[] result = {0,0,0,0,0,0,0,0,0,0,0,0,0};
    for (int i=0; i<number; i++) 
      result[roll()]++;
    return result;
  }
  public static void main(String[] args) {
    int[] diceThrows; // Elements 2-12 store frequencies
    int numberOfRolls;       // Number of rolls of the dice

    numberOfRolls = Io.readInt("Enter the number of rolls of the dice");
    diceThrows = tossResults(numberOfRolls);
    System.out.println("Sum\tFrequency");
    for (int i=2; i<=12; i++) 
      System.out.println(i + "\t" +diceThrows[i]);
    Io.readString("Press any key to exit");   // Added for IDE use  
  }
}