java 返回一个数组（java 编程思想4）P436 例子详解

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package arrays;//: arrays/IceCream.java// Returning arrays from methods.import java.util.*;public class IceCream {  private static Random rand = new Random(47);  static final String[] FLAVORS = {    "Chocolate", "Strawberry", "Vanilla Fudge Swirl",    "Mint Chip", "Mocha Almond Fudge", "Rum Raisin",    "Praline Cream", "Mud Pie"  };  public static String[] flavorSet(int n) {    if(n > FLAVORS.length)      throw new IllegalArgumentException("Set too big");    String[] results = new String[n];  //System.out.println(FLAVORS.length); FLAVORS.length=8    boolean[] picked = new boolean[FLAVORS.length];//定义一个 boolean 类型的数组 大小是FLAVORS.length=8    for(int i = 0; i < n; i++) {      int t;      do      {    t = rand.nextInt(FLAVORS.length); //产生随机数  System.out.println(picked[t]);}      while(picked[t]);       /*boolean 数组中默认初始化为 false while 遇到“假” 循环结束         并且   results[i] = FLAVORS[t]  */   //   System.out.println(i+" "+t);      results[i] = FLAVORS[t];      picked[t] = true;//  确保不会重复    }    return results;  }  public static void main(String[] args) {    for(int i = 0; i < 7; i++)      System.out.println(Arrays.toString(flavorSet(3)));    System.out.println(new boolean[FLAVORS.length]);  }} /* Output:[Rum Raisin, Mint Chip, Mocha Almond Fudge][Chocolate, Strawberry, Mocha Almond Fudge][Strawberry, Mint Chip, Mocha Almond Fudge][Rum Raisin, Vanilla Fudge Swirl, Mud Pie][Vanilla Fudge Swirl, Chocolate, Mocha Almond Fudge][Praline Cream, Strawberry, Mocha Almond Fudge][Mocha Almond Fudge, Strawberry, Mint Chip]*///:~
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