双色球代码出现null值 求大神现身相助
运行几次有时候出现null 想不明白啊  求指点

package com.xxxx.d03;

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

public class TwoColorBalls02 {

/**
 * @param args
 */
public static void main(String[] args) {
// TODO Auto-generated method stub
String[] thenumber=getTheNumber();
System.out.println(Arrays.toString(thenumber));
}

private static String[] getTheNumber() {
// TODO Auto-generated method stub
String[] poolStrings={
"01","02","03","04","05","06","07","08","09","10","11","12","13","14","15"
,"16","17","18","19","20","21","22","23","24","25","26","27","28","29","30",
"31","32","33"
};
Random random=new Random();
String[] redBalls=new String[6];//6个红球
// System.out.println(redBalls.length);

Lab:for (int i = 0; i < redBalls.length; i++) {
int index = random.nextInt(33);
String getBalls=poolStrings[index];
//保证不重复
for (int j = 0; j < redBalls.length; j++) {
if (getBalls.equals(redBalls[j])) {
continue Lab;
}
}
redBalls[i]=poolStrings[index];
}
String blueBalls=(1+random.nextInt(16))+"";//一个篮球
//copyOf应该是redBalls
String[] theBalls=Arrays.copyOf(redBalls, redBalls.length+1);
theBalls[theBalls.length-1]=blueBalls;
return theBalls;
}

}

------解决方案--------------------
continue LAB 的时候 i++也执行了啊 。   把他移下来就好了。

Lab: for (int i = 0; i < redBalls.length; ) {

			int index = random.nextInt(33);

			String getBalls = poolStrings[index];

			// 保证不重复

			for (int j = 0; j < redBalls.length; j++) {

				if (getBalls.equals(redBalls[j])) {

					continue Lab;

				}

			}

			redBalls[i] = poolStrings[index];

			i++;

		}

------解决方案--------------------

boolean flag = true;

		int index = 0;

		while(flag) {

			int randomNumber = random.nextInt(33);

			String getBalls=poolStrings[randomNumber];

			//System.out.println("randomNumber值：" + randomNumber + "\t" + "getBalls：" + getBalls);



			boolean isInsert = true;

			for(int i = 0; i < redBalls.length; i++) {

				if(getBalls.equals(redBalls[i])) {

					isInsert = true;

					break;

				}

			}

			

			if(isInsert) {

				redBalls[index] = getBalls;

				index++;

				if(index >= redBalls.length) {

					flag = false;

				}

			}

		}

不用for 你的那个循环 当是重复的时候，会index++  那么当前的那个值并没有填充到 自然是null  然会直接跳到去填充下一个值了
------解决方案--------------------
你用断点运行一下就知道哪里报的空了。