- Java is a interpreted language

After .java is compiled into .class, JVM takes .class as input, one line at a time, translates a line into machine language to have it executed.

(The other kind is complied language, ex. C/C++)

Photo link Test:

Below are some self-collected commonly-used commands.

start

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# run in the background
mongod

# open interactive shell
mongo

# in python 
from pymongo import MongoClient
Client = MongoClient()
db = Client[dbname]

Useful links:

1. nosql intro：
   http://www.runoob.com/mongodb/nosql.html
2. Different kinds of databases summaries:
   https://www.jianshu.com/p/107c6b045245

Marking down some commonly used shell command:

Mac 命令行命令

history 显示命令历史列表
[Tab] =命令行自动补全
↑(Ctrl+p) 显示上一条命令
↓(Ctrl+n) 显示下一条命令
clear 清除 shell 提示屏幕
exit 注销
history 显示命令历史
reset 刷新 shell 提示屏幕

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561. Array Partition I

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