关于boolean

import java.util.*;
public class IceCream
{
 private static Random rand=new Random();
 public 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){
  String[] results=new String[n];
  boolean[] picked=new boolean[flavors.length];
  for(int i=0;i<n;i++){
   int t;
   do
     t=rand.nextInt(flavors.length);
   while(picked[t]);
   results[i]=flavors[t];
   picked[t]=true;
  }
  return results;
 }
 public static void main(String[] args)
 {
  for(int i=0;i<20;i++){
   System.out.println("flavorSet("+i+")=");
   String[] f1=flavorSet(flavors.length);
   for(int j=0;j<f1.length;j++)
    System.out.println("/t"+f1[j]);
  }
 }
}

boolean []picked=new boolean[flavors.length];

这一行意思是创建boolean型的一个数组，长度是flavors.length.所谓boolean型数组，其元素全部是boolean型值：true and false.