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)-LMLPHP

05-08 15:10