抱歉，回复晚了，平常不登简书。其实这是因为空指针异常，a与b是一个数组，有可能是null，当你查询长度，就会出现NullPointException
Are they the "same"?难题Given two arrays a and b write a function comp(a, b) (compSame(a, b) in Clojure) that...
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【入门】安装Kafka
安装Kafka 打开CMD 到C:\Develop\kafka_2.11-0.9.0.0这个路径下，输入 ——启动Kafka，可以创建主题来存储消息 创建主题 打开CMD 到...
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【入门】安装Zookeeper
安装Zookeeper 进入zookeeper设置目录，C:\Develop\Zookeeper\conf 将"zoo_sample.cfg" 复制一份，重命名为"zoo.c...
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【入门】安装MongoDB
安装 以管理员方式打开cmd 进入安装包的文件夹下，执行msiexec.exe /q /i mongodb-win32-x86_64-2008plus-ssl-3.6.4-s...
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【入门】安装Elasticsearch
下载 https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.4.zip 解压缩，运行 ...
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【入门】安装Elastic-job-lite-console
解压缩elastic-job-lite-console-${version}.tar.gz并执行bin\start.bat。 打开浏览器访问http://localhost:...
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【入门】安装Consul
下载：https://www.consul.io/downloads.html 设置环境变量计算机 右键 属性 高级属性设置环境变量设置在path下加上：C:\Devel...
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Directions Reduction
Once upon a time, on a way through the old wild west,… … a man was given directions to ...
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Tortoise racing
Two tortoises named A and B must run a race. A starts with an average speed of 720 feet...
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Create Phone Number
Write a function that accepts an array of 10 integers (between 0 and 9), that returns a...
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Give me a Diamond
This kata is to practice simple string output. Jamie is a programmer, and James' girlfr...
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Sort the odd
You have an array of numbers.Your task is to sort ascending odd numbers but even number...
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Take a Number And Sum Its Digits Raised To The Consecutive Powers And ....¡Eureka!!
The number 89 is the first integer with more than one digit that fulfills the property ...
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Which are in?
Given two arrays of strings a1 and a2 return a sorted array r in lexicographical order ...
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Find the missing letter
Find the missing letter Write a method that takes an array of consecutive (increasing) ...
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Delete occurrences of an element if it occurs more than n times
Enough is enough! Alice and Bob were on a holiday. Both of them took many pictures of t...
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Are they the "same"?
难题Given two arrays a and b write a function comp(a, b) (compSame(a, b) in Clojure) that...
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The Supermarket Queue
There is a queue for the self-checkout tills at the supermarket. Your task is write a f...
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Bit Counting
Write a function that takes an (unsigned) integer as input, and returns the number of b...
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Counting Duplicates
Count the number of Duplicates Write a function that will return the count of distinct ...