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Rolls.java (page44)

对象的数组:模拟T次投掷骰子的Counter对象的用例:

Rolls.java 如下:所用类列表:Counter, StdOut, StdRandom 见page42

public class Rolls{    public static void main(String[] args){        int T = Integer.parseInt(args[0]);//转String为int        int SIDES = 6;        Counter[] rolls = new Counter[SIDES+1];//声明数组        for(int i=1;i<=SIDES;i++)            rolls[i] = new Counter(i + "‘s");        for(int t=1;t<=T;t++){            int result = StdRandom.uniform(1,SIDES+1); //去随机数, 1-7            rolls[result].increment();//给1-7号元素自增1        }        for(int i=1;i<=SIDES;i++)            StdOut.println(rolls[i]);    }}

 

打印结果:

Rolls.java (page44)