双色球问题~高手请指教

[乀Lan]

package basic.day05;

import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class DoubleBall {

/**
* 雙色球
*/
public static void main(String[] args) {
String[] redBall = {"01","02","03","04","05","06","07","08","09",
"11","12","13","14","15","16","17","18","19",
"21","22","23","24","25","26","27","28","29",
"30","31","32","33"};
String[] buleBall = {"01","02","03","04","05","06","07","08","09",
"11","12","13","14","15","16"};
boolean[] labelBall = new boolean[33];
Random ra = new Random();
Scanner console = new Scanner(System.in);
System.out.print("输入所买双色球的注数：");
int n = console.nextInt();
for(int i = 0; i < n; i++){
int s = ra.nextInt(16);
String[] ball = choose(redBall,labelBall);
System.out.print("电脑随机出红蓝球为：");
Arrays.sort(ball);
System.out.print(Arrays.toString(ball));
System.out.println("\t["+buleBall[s]+"]");
}

}
public static String[] choose(String[] redBall, boolean[] labelBall ){
String[] newBall = {};
Random ra = new Random();
int s;
for(int i = 0; i < 6; i++){

do{
s = ra.nextInt(33);
}while(labelBall[s] == true);
labelBall[s] = true;
newBall = Arrays.copyOf(newBall, newBall.length + 1);
newBall[newBall.length-1] = redBall[s];
}
return newBall;
}
}

我看了好久 还是不知道那错了。 为什么有时候运行的时候可以 有的时候运行就报错了。 请高手指点。 请说清楚。不要说“越界”两个字就行了。 谢谢。。

[riyuezhizhi]

LZ太粗心了，你的
String[] redBall = {"01","02","03","04","05","06","07","08","09",
"11","12","13","14","15","16","17","18","19",
"21","22","23","24","25","26","27","28","29",
"30","31","32","33"};
这个数组里面少了10，和20两个数字，或者说是这个数组的长度根本不是33，所以在s=32\31时，redBall[s]就越界了

[TKD03072010]

[Quote=引用 1 楼 riyuezhizhi 的回复:]

LZ太粗心了，你的
String[] redBall = {"01","02","03","04","05","06","07","08","09",
"11","12","13","14","15","16","17","18","19",
"21","22","23","24","25","26","27","28","29",
"30","31","32","33"};
这个数组……
[/Quote]
哈哈

[乀Lan]

上面说的对。。
我竟然没看见。。
谢谢你们。。。
呵呵。。我还在注意for循环呢。。
没看到定义的数。。。。。