Shilong Li

Shilong Li

Persistence and determination alone are omnipotent

Debugging Tips

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Some debugging tips

Debugging tips

  • Fantastic programming -> headache debugging

Error & Exception

Runtime Exceptions

  • 数组越界
    1. 删东西了/多删了一个？
    2. 数组建的不够大
    3. index从0开始而不是1
  • 解决办法
    1. 每次建数组的时候多开一段内存空间
    2. safety check

NPE

  • 现阶段的NPE本质上还是没有完全理解类与对象的概念
  • 对象中套对象
  • 是否已经创建对象

Stack overflow Error

  • 递归调用
  • 一般来说是死循环了
  • 方法/函数之间有环 A-> B -> C -> A

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How to login in the server without password

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On client

  1. use ssh-keygen to generate public key of local machine.
  2. copy id_rsa.pub

On server

  1. under ~/.ssh, execute touch authorized_keys && chmod 600 authorized_keys
  2. copy id_rsa.pub into authorized_keys

GRE考试分享

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知乎外链：https://zhuanlan.zhihu.com/p/410814772